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DEI Document - USD ($) $ in Millions	12 Months Ended
DEI Document - USD ($) $ in Millions	Sep. 30, 2012	Dec. 10, 2012	Mar. 31, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	INTL FCSTONE INC.
Trading Symbol	INTL
Entity Central Index Key	0000913760
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		19,001,132
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 238.4

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 236.3	$ 220.6
Cash, securities and other assets segregated under federal and other regulations (including $72.8 and $22.7 at fair value at September 30, 2012 and September 30, 2011 respectively)	357.5	119.4
Deposits with and receivables from:
Exchange-clearing organizations (including $1,510.0 and $1,408.2 at fair value at September 30, 2012 and September 30, 2011, respectively)	1,619.8	1,489.2
Broker-dealers, clearing organizations and counterparties (including $(0.7) and $16.2 at fair value at September 30, 2012 and September 30, 2011, respectively)	127.4	146.5
Receivables from customers, net	68.9	115.9
Notes receivable, net	104.0	26.3
Income taxes receivable	11.9	8.8
Financial instruments, owned, at fair value	171.7	223.1
Physical commodities inventory	131.6	160.6
Deferred income taxes, net	21.9	20.7
Property and equipment, net	18.9	15.0
Goodwill and intangible assets, net	54.7	56.1
Other assets	34.3	33.5
Total assets	2,958.9	2,635.7
Liabilities:
Accounts payable and other accrued liabilities (including $14.8 and $22.3 at fair value at September 30, 2012 and September 30, 2011)	127.0	122.0
Payables to:
Customers	2,072.3	1,739.8
Broker-dealers, clearing organizations and counterparties	39.4	3.4
Lenders under loans	218.2	77.4
Income taxes payable	5.5	4.6
Financial instruments sold, not yet purchased, at fair value	175.4	390.9
Deferred income taxes	2.0	0.0
Total liabilities	2,639.8	2,338.1
Commitments and contingencies (Note 11)
INTL FCStone Inc. stockholders’ equity:
Preferred stock, $.01 par value. Authorized 1,000,000 shares; no shares issued or outstanding	0.0	0.0
Common stock, $.01 par value. Authorized 30,000,000 shares; 19,214,219 issued and 18,984,951 outstanding at September 30, 2012 and 18,653,964 issued and 18,642,407 outstanding at September 30, 2011	0.2	0.2
Common stock in treasury, at cost - 229,064 shares at September 30, 2012 and 11,557 shares at September 30, 2011	4.1	0.1
Additional paid-in capital	213.2	205.2
Retained earnings	112.0	97.0
Accumulated other comprehensive loss, net	(2.2)	(6.0)
Total INTL FCStone Inc. stockholders' equity	319.1	296.3
Noncontrolling interests	0.0	1.3
Total equity	319.1	297.6
Total liabilities and equity	$ 2,958.9	$ 2,635.7

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Assets [Abstract]
Securities and other assets segregated, fair value	$ 72.8	$ 22.7
Dep and rec -exch clear org - fair value	1,510.0	1,408.2
Receivables from Brokers-Dealers and Clearing Organizations	(0.7)	16.2
Accounts Payable and Other Accrued Liabilities	$ 14.8	$ 22.3
Preferred stock - par value	$ 0.01	$ 0.01
Preferred stock - authorized	1,000,000	1,000,000
Preferred stock - issued	0	0
Preferred stock - outstanding	0	0
Common stock - par value	$ 0.01	$ 0.01
Common stock - authorized	30,000,000	30,000,000
Common stock - issued	19,214,219	18,653,964
Common stock - outstanding	18,984,951	18,642,407
Treasury Stock - Shares	229,064	11,557

Consolidated Income Statements - USD ($) $ in Millions	12 Months Ended
Consolidated Income Statements - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Sales of physical commodities	$ 68,812.5	$ 75,123.4	$ 46,709.2
Trading gains, net	248.4	205.7	86.5
Commission and clearing fees	161.0	134.5	119.9
Consulting and management fees	27.9	22.7	17.2
Interest income	10.3	10.3	7.0
Other Income	0.5	1.0	0.5
Total revenues	69,260.6	75,497.6	46,940.3
Cost of sales of physical commodities	68,802.9	75,074.4	46,671.3
Operating revenues	457.7	423.2	269.0
Interest expense	11.6	11.3	9.9
Net revenues	446.1	411.9	259.1
Non-interest expenses:
Compensation and benefits	202.4	176.6	104.2
Clearing and related expenses	107.2	77.4	68.2
Introducing broker commissions	31.0	24.0	18.9
Communication and data services	22.6	15.5	11.1
Occupancy and equipment rental	11.0	8.9	6.2
Professional Fees	12.9	10.6	8.1
Depreciation and amortization	7.2	4.7	1.6
Bad debts and impairments	1.5	6.2	5.8
Other	31.0	28.5	17.1
Total non-interest expenses	426.8	352.4	241.2
Income from continuing operations, before tax	19.3	59.5	17.9
Income tax expense	4.4	22.5	6.4
Net income from continuing operations	14.9	37.0	11.5
Income from discontinued operations, net of tax	0.0	0.2	0.6
Income before extraordinary loss	14.9	37.2	12.1
Extraordinary loss	0.0	0.0	(7.0)
Net income	14.9	37.2	5.1
Add: Net loss attributable to noncontrolling interests	0.1	0.1	0.3
Net income attributable to INTL FCStone Inc. common stockholders	$ 15.0	$ 37.3	$ 5.4
Basic earnings per share:
Income from continuing operations attributable to INTL FCStone Inc. common stockholders	$ 0.79	$ 2.06	$ 0.68
Income from discontinued operations attributable to INTL FCStone Inc. common stockholders	0.00	0.01	0.03
Extraordinary loss attributable to INTL FCStone Inc. common stockholders	0	0.00	(0.40)
Net income attributable to INTL FCStone Inc. common stockholders	0.79	2.07	0.31
Diluted earnings per share:
Income from continuing operations attributable to INTL FCStone Inc. common stockholders	0.75	1.95	0.66
Income from discontinued operations attributable to INTL FCStone Inc. common stockholders	0.00	0.01	0.03
Extraordinary loss attributable to INTL FCStone Inc. common stockholders	0	0.00	(0.39)
Net income attributable to INTL FCStone Inc. common stockholders	$ 0.75	$ 1.96	$ 0.30
Weighted-average number of common shares outstanding:
Basic	18,282,939	17,618,085	17,306,019
Diluted	19,156,899	18,567,454	17,883,233
Amounts attributable to INTL FCStone Inc. common stockholders:
Income from continuing operations, net of tax	$ 15.0	$ 37.1	$ 11.8
Income from discontinued operations, net of tax	0.0	0.2	0.6
Extraordinary loss	0.0	0.0	(7.0)
Net income attributable to INTL FCStone Inc. common stockholders	$ 15.0	$ 37.3	$ 5.4

Consolidated Cash Flows Statements - USD ($) $ in Millions	12 Months Ended
Consolidated Cash Flows Statements - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 14.9	$ 37.2	$ 5.1
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	7.2	4.7	1.7
Provision for bad debts and impairments	1.7	6.2	3.5
Deferred income taxes	(0.3)	1.8	3.7
Amortization of debt issuance costs and debt discount	1.7	1.6	0.2
Convertible debt interest settled in company stock upon conversion	0.0	0.2	0.0
Amortization of stock-based compensation expense	5.9	2.3	1.9
Extraordinary loss on acquisition of FCStone	0.0	0.0	7.0
Impairment of INTL Sieramet	0.0	0.0	1.1
Deconsolidation and impairment of Agora-X subsidiary	0.0	0.0	(2.9)
Gain on acquisition of INTL Provident	0.0	(0.4)	0.0
Changes in operating assets and liabilities, net:
Cash, securities and other assets segregated under federal and other regulations	(199.9)	(104.1)	(0.3)
Deposits and receivables from exchange-clearing organizations	(97.7)	(586.0)	(4.2)
Deposits and receivables from broker-dealers, clearing organizations, and counterparties	42.7	47.1	(57.6)
Receivable from customers, net	46.4	(39.1)	(18.2)
Notes receivable, net	(77.9)	2.9	(7.0)
Income taxes receivable	(3.1)	0.6	35.4
Financial instruments owned, at fair value	58.3	280.7	(212.7)
Physical commodities inventory	29.0	(35.6)	(18.1)
Other assets	(1.6)	(12.1)	3.9
Accounts payable and other accrued liabilities	10.6	30.8	1.9
Payable to customers	248.0	366.2	415.3
Payable to broker-dealers, clearing organizations and counterparties	35.9	(0.5)	(0.4)
Income taxes payable	1.6	1.6	0.4
Financial instruments sold, not yet purchased, at fair value	(215.5)	202.9	(46.7)
Net cash (used in) provided by operating activities	(92.1)	209.0	113.0
Cash flows from investing activities:
Deconsolidation of affiliates	0.4	0.0	(0.3)
Disposition of affiliates	0.0	0.0	0.2
Cash paid for other acquisitions, net	(11.7)	(9.3)	(37.6)
Purchase of exchange memberships and common stock	0.0	(3.4)	0.0
Sale of exchange memberships and common stock	0.0	1.3	0.0
Purchase of property and equipment	(8.7)	(10.1)	(4.7)
Net cash used in investing activities	(20.0)	(21.5)	(42.4)
Cash flows from financing activities:
Net change in payable to lenders under loans	140.8	(37.5)	6.1
Payments related to earn-outs on acquisitions	(9.6)	(9.4)	0.0
Repayment of subordinated debt	0.0	(0.5)	(56.0)
Share repurchase	(4.0)	0.0	0.0
Debt issuance costs	(0.3)	(2.4)	0.0
Exercise of stock options	1.9	1.4	0.7
Income tax benefit on stock options and awards	0.2	0.0	0.0
Net cash provided by financing activities	129.0	(48.4)	(49.2)
Effect of exchange rates on cash and cash equivalents	(1.2)	(0.4)	0.0
Net increase (decrease) in cash and cash equivalents	15.7	138.7	21.4
Cash and cash equivalents at beginning of period	220.6	81.9	60.5
Cash and cash equivalents at end of period	236.3	220.6	81.9
Supplemental disclosure of cash flow information:
Cash paid for interest	7.9	9.5	7.4
Income taxes paid (received), net of cash refunds	6.1	17.6	(33.3)
Supplemental disclosure of non-cash investing and financing activities:
Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments	0.0	16.7	0.0
Goodwill and intangible assets acquired during the period	1.8	4.9	39.8
Additional consideration payable related to acquisitions	$ 2.1	$ 5.4	$ 26.3

Consolidated Statements of Stockholders’ Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]
Balances at beginning of period at Sep. 30, 2009	$ 240.5	$ 0.2	$ (0.1)	$ 187.0	$ 54.3	$ (2.6)	$ 1.7
Components of comprehensive income
Net income	5.1				5.4		(0.3)
Change in foreign currency translation, net of tax	(0.1)					(0.1)
Change in unrealized loss on derivative instruments, net of tax						1.1
Change in pension liabilities, net of tax	(1.7)
Change in unrealized gain or loss on available-for-sale securities, net of tax	0.2
Total comprehensive income	4.6
Exercise of stock options	0.7			0.7
Stock-based Compensation	1.9			1.9
Acquisition or consolidation	1.6
Disposition or de-consolidation	(1.4)						(1.4)
Stock held in escrow for business combination	(5.0)
Balances at end of period at Sep. 30, 2010	242.9	0.2	(0.1)	184.6	59.7	(3.1)	1.6
Components of comprehensive income
Net income	37.2				37.3		(0.1)
Change in foreign currency translation, net of tax	(0.4)					(0.4)
Change in unrealized loss on derivative instruments, net of tax						1.0
Change in pension liabilities, net of tax	(2.9)
Change in unrealized gain or loss on available-for-sale securities, net of tax	(0.6)
Total comprehensive income	34.3
Redemption of fund units	(0.2)
Exercise of stock options	1.4			1.4
Stock-based Compensation	2.3			2.3
Convertible note conversions	16.9
Balances at end of period at Sep. 30, 2011	297.6	0.2	(0.1)	205.2	97.0	(6.0)	1.3
Components of comprehensive income
Net income	14.9				15.0		(0.1)
Change in foreign currency translation, net of tax	(1.1)					(1.1)
Change in pension liabilities, net of tax	(1.6)
Change in unrealized gain or loss on available-for-sale securities, net of tax	6.5
Total comprehensive income	18.7
Exercise of stock options	1.9
Stock-based Compensation	5.9			5.9
Exercise of stock options	2.1			2.1
Disposition or de-consolidation	(1.2)						(1.2)
Repurchase of stock	(4.0)		(4.0)
Balances at end of period at Sep. 30, 2012	$ 319.1	$ 0.2	$ (4.1)	$ 213.2	$ 112.0	$ (2.2)	$ 0.0

Condensed Parent Only Financial Statements [Schedule] Balance Sheet (Parentheticals) - $ / shares	Sep. 30, 2012	Sep. 30, 2011
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Preferred stock - par value	$ 0.01	$ 0.01
Preferred stock - authorized	1,000,000	1,000,000
Preferred stock - issued	0	0
Preferred stock - outstanding	0	0
Common stock - par value	$ 0.01	$ 0.01
Common stock - authorized	30,000,000	30,000,000
Common stock - issued	19,214,219	18,653,964
Common stock - outstanding	18,984,951	18,642,407
Treasury Stock - Shares	229,064	11,557

Description of Business and Significant Accounting Policies Description of Business and Significant Accounting Policies (Notes)	12 Months Ended
	Sep. 30, 2012
Organization, Consolidation, Presentation of Financial Statements and Accounting Policies [Abstract]
Business Description and Accounting Policies [Text Block]	Note 1 – Description of Business and Significant Accounting Policies INTL FCStone Inc., a Delaware corporation, and its consolidated subsidiaries (collectively “INTL” or “the Company”), form a financial services group focused on domestic and select international markets. The Company’s services include comprehensive risk management advisory services for commercial customers; execution of listed futures and options-on-futures contracts on all major commodity exchanges; structured over-the-counter (“OTC”) products in a wide range of commodities; physical trading and hedging of precious and base metals and select other commodities; trading of more than 130 foreign currencies; market-making in international equities; debt origination and asset management. The Company provides these services to a diverse group of more than 20,000 customers located throughout the world, including producers, processors and end-users of nearly all widely-traded physical commodities to manage their risks and enhance margins; to commercial counterparties who are end-users of the firm’s products and services; to governmental and non-governmental organizations; and to commercial banks, brokers, institutional investors and major investment banks. Basis of Presentation The accompanying consolidated financial statements include the accounts of INTL FCStone Inc. and all other entities in which the Company has a controlling financial interest. All material intercompany transactions and balances have been eliminated in consolidation. Unless otherwise stated herein, all references to 2012, 2011, and 2010 refer to the Company’s fiscal years ended September 30. Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. The most significant of these estimates and assumptions relate to fair value measurements for financial instruments and investments, revenue recognition, the provision for potential losses from bad debts, valuation of inventories, valuation of goodwill and intangible assets, incomes taxes and contingencies. These estimates are based on management's best knowledge of current events and actions the Company may undertake in the future. The Company reviews all significant estimates affecting the financial statements on a recurring basis and records the effect of any necessary adjustments prior to their issuance. Although these and other estimates and assumptions are based on the best available information, actual results could be materially different from these estimates. Foreign Currency Translation Assets and liabilities recorded in foreign currencies are translated at the exchange rates prevailing on the balance sheet date. Revenue and expenses are translated at average rates of exchange prevailing during the period. Gains or losses on translation of the financial statements of a non-United States (“U.S.”) operation, when the functional currency is other than the U.S. dollar, are recorded in other comprehensive income (“OCI”), net of tax, a component of stockholders' equity. Foreign currency remeasurement gains or losses on transactions in nonfunctional currencies are included within 'trading gains, net' in the consolidated income statements. Cash and Cash Equivalents The Company considers cash held at banks and all highly liquid investments, including certificates of deposit, which may be withdrawn at any time at the discretion of the Company without penalty, to be cash and cash equivalents. Cash and cash equivalents consist of cash, foreign currency, money market funds and certificates of deposit not deposited with or pledged to an exchange-clearing organization. The money market funds are valued at period-end at the net asset value provided by the fund’s administrator, which approximates fair value. Certificates of deposit are stated at cost plus accrued interest, which approximates fair value. All cash and cash equivalents that are deposited with brokers, dealers and clearing organizations support the Company’s trading activities, and are subject to contractual restrictions. The Company has an investment policy, which limits the maximum amount placed in any one fund and with any one institution in order to reduce credit risk. The Company does not believe that it is exposed to significant risk on cash and cash equivalents. Cash, Securities and Other Assets Segregated under Federal and other Regulations Pursuant to requirements of the Commodity Exchange Act in the U.S. and similarly in the United Kingdom ("UK"), pursuant to the Markets in Financial Instruments Implementing Directive 2006/73/EC underpinning the Client Asset or 'CASS' rules in the Financial Services Authority ("FSA") handbook, funds deposited by customers relating to futures and options-on-futures contracts in regulated commodities must be carried in separate accounts which are designated as segregated customer accounts. The deposits in segregated customer accounts are not commingled with the funds of the Company. Under the FSA's rules, certain categories of clients may choose to opt-out of segregation. As of September 30, 2012 and 2011, cash, securities and other assets segregated under federal and other regulations consisted of cash held at banks and money market funds of approximately $284.7 million and $96.7 million, respectively, U.S. government securities and federal agency obligations of approximately $50.5 million and $3.7 million, respectively, and commodities warehouse receipts of approximately $22.3 million and $19.0 million, respectively (see fair value measurements discussion in Note 3). Securities purchased under agreements to resell The Company has an overnight sweep reverse repurchase agreement program to allow the Company to enter into secured overnight investments (reverse repurchase agreements or reverse repos), which generally provides a higher investment yield than a regular operating account. The reverse repurchase agreements are recorded at amounts at which the securities were initially acquired. It is the policy of the Company to take possession of the securities purchased under agreements to resell. The Company receives U.S. Treasury securities as collateral for the overnight agreements. The securities received are recorded at no more than the lesser of the current fair value of the securities or the net amount to be realized by the Company upon resale of the securities. The maturity of the reverse repurchase agreements is typically one day, at which point the securities are sold and the proceeds are returned to the Company, plus any accrued interest. There were no agreements to resell securities as of September 30, 2012 and 2011. Deposits and Receivables from Exchange-Clearing Organizations, Broker-dealers, Clearing Organizations and Counterparties, and Payables to Broker-dealers, Clearing Organizations and Counterparties As required by the regulations of the U.S. Commodity Futures Trading Commission (“CFTC”) and the Markets in Financial Instruments Implementing Directive 2006/73/EC underpinning the CASS rules in the FSA handbook, customer funds received to margin, guarantee, and/or secure commodity futures transactions are segregated and accounted for separately from the general assets of the Company. Under the FSA's rules, certain categories of clients may choose to opt-out of segregation. Deposits with exchange-clearing organizations, broker-dealers and counterparties pertain primarily to deposits made to satisfy margin requirements on customer and proprietary open futures and options-on-futures positions and to satisfy the requirements set by clearing exchanges for clearing membership. The Company also pledges margin deposit with various counterparties for OTC derivative contracts, and these deposits are also included in deposits and receivables from broker-dealers and counterparties. Deposits with and receivables from exchange-clearing organizations and broker-dealers and counterparties are reported gross, except where a right of offset exists. As of September 30, 2012 and 2011, the Company had cash and cash equivalents on deposit with or pledged to exchange-clearing organizations, broker-dealers and counterparties of $0.4 billion and $1.2 billion, respectively. These balances also include securities pledged by the Company on behalf of customers and customer-owned securities that are pledged. It is the Company’s practice to include customer owned securities on its consolidated balance sheets, as the rights to those securities have been transferred to the Company under the terms of the futures trading agreement. Securities pledged include U.S. Treasury bills and instruments backed by U.S. government sponsored entities and government-sponsored enterprise backed mortgage-backed securities ("mortgage-backed securities"). The securities that are not customer-owned are adjusted to fair value with associated changes in unrealized gains or losses recorded in OCI, net of tax, until realized, a component of stockholders' equity. For customer owned securities, the change in fair value is offset against the payable to customers with no impact recognized on the consolidated income statements. The securities, primarily U.S. Government obligations and mortgage-backed securities, held by FCStone LLC ("FCStone"), a subsidiary of INTL, as collateral or as margin have been deposited with exchange-clearing organizations, broker-dealers or other counterparties. The fair value of these securities was approximately $1.3 billion and $0.5 billion as of September 30, 2012 and 2011, respectively. Management has considered guidance required by the Transfers and Servicing Topic of the ASC as it relates to securities pledged by customers to margin their accounts. Based on a review of the agreements with the customer, management believes a legal basis exists to support that the transferor surrenders control over those assets if all of the following three conditions are met: (a) the transferred assets have been isolated from the transferor—put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership, (b) each transferee has the right to pledge or exchange the assets (or beneficial interests) it received, and no condition both constrains the transferee (or holder) from taking advantage of its right to pledge or exchange and provides more than a trivial benefit to the transferor and (c) the transferor does not maintain effective control over the transferred assets through either (1) an agreement that both entitles and obligates the transferor to repurchase or redeem them before their maturity or (2) the ability to unilaterally cause the holder to return specific assets, other than through a cleanup call. Under this guidance, the Company reflects the customer collateral assets and corresponding liabilities in the Company’s consolidated balance sheets as of September 30, 2012 and 2011. In addition to margin, deposits with exchange-clearing organizations include guaranty deposits. The guaranty deposits are held by the clearing organization for use in potential default situations by one or more members of the clearing organization. The guaranty deposits may be applied to the Company’s obligations to the clearing organization, or to the clearing organization’s obligations to other clearing members or third parties. The Company maintains customer omnibus and proprietary accounts with other counterparties, and the equity balances in those accounts along with any margin cash or securities deposited with the carrying broker are included in deposits and receivables from broker-dealers and counterparties. Receivables from and payables to exchange-clearing organizations are also comprised of amounts due from or due to exchange-clearing organizations for daily variation settlements on open futures and options-on-futures positions. The variation settlements due from or due to exchange-clearing organizations are paid in cash on the following business day. Deposits and receivables with exchange-clearing organizations also includes the unrealized gains and losses associated with the customers' options-on-futures contracts. See discussion in the Financial Instruments and Derivatives section below for additional information on the treatment of derivative contracts. For customer owned derivative contracts, the fair value is offset against the payable to customers with no impact recognized on the consolidated income statements. Receivables from and Payables to Customers Receivables from customers, net of the allowance for doubtful accounts, include the total of net deficits in individual exchange-traded and OTC trading accounts carried by the Company. Customer deficits arise from realized and unrealized trading losses on futures, options-on-futures, swaps and forwards and amounts due on cash and margin transactions. Customer deficit accounts are reported gross of customer accounts that contain net credit or positive balances, except where a right of offset exists. Net deficits in individual exchange-traded and OTC trading accounts include both secured and unsecured deficit balances due from customers as of the balance sheet date. Secured deficit amounts are backed by U.S. Treasury bills and notes with a fair value of $0.8 million and $0.4 million as of September 30, 2012 and 2011, respectively, and commodity warehouse receipts with a fair value of $7.5 million and $16.2 million as of September 30, 2012 and 2011, respectively. These U.S Treasury bills and notes and commodity warehouse receipts are not netted against the secured deficit amounts, as the conditions for right of setoff have not been met. Payables to customers represent the total of customer accounts with credit or positive balances. Customer accounts are used primarily in connection with commodity transactions and include gains and losses on open commodity trades as well as securities and other deposits made as required by the Company or the exchange-clearing organizations or counterparties. Customer accounts with credit or positive balances are reported gross of customer deficit accounts, except where a right of offset exists. For regulatory purposes, certain customers, which would include persons who are affiliated with the Company or are principals, such as an officer or director, and any person who is materially involved in the management of the Company, are identified as noncustomers. A noncustomer account may not be carried as a customer account due to an affiliation with the Company. In a liquidation event, amounts owed to noncustomers are paid in the same priority as amounts owed to general creditors of the Company. These accounts are also referred to as proprietary accounts. The amounts related to noncustomer accounts are included in 'payables to customers' on the consolidated balance sheets. The future collectability of the receivables from customers can be impacted by the Company’s collection efforts, the financial stability of its customers, and the general economic climate in which it operates. The Company evaluates accounts that it believes may become uncollectible on a specific identification basis, through reviewing daily margin deficit reports, the historical daily aging of the receivables, and by monitoring the financial strength of its customers. The Company may unilaterally close customer trading positions in certain circumstances. In addition, to evaluate customer margining and collateral requirements, customer positions are stress tested regularly and monitored for excessive concentration levels relative to the overall market size. The Company generally charges off an outstanding receivable balance when all economically sensible means of recovery have been exhausted. That determination considers information such as the occurrence of significant changes in the customer's financial position such that the customer can no longer pay the obligation, or that the proceeds from collateral will not be sufficient to pay the balance. Notes Receivable The Company originates short-term notes receivable from customers with the outstanding balances being insured 90% to 98% by a third party, including accrued interest. The Company may sell the insured portion of the notes through non-recourse participation agreements with other third parties. See discussion of notes receivable related to commodity repurchase agreements below. Accrual of commodity financing income on any note is discontinued when, in the opinion of management, there is reasonable doubt as to the timely collectability of interest or principal. Nonaccrual notes are returned to an accrual status when, in the opinion of management, the financial position of the borrower indicates there is no longer any reasonable doubt as to the timely payment of principal and interest. The Company records a charge against earnings for notes receivable losses when management believes that collectability of the principal is unlikely. Physical Commodities Inventory Physical commodities inventories are stated at the lower of cost or market ("LCM"), using the weighted-average price and first-in first-out costing method. Cost includes finished commodity or raw material and processing costs related to the purchase and processing of inventories. Property and Equipment Property and equipment is stated at cost, net of accumulated depreciation and amortization and depreciated using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized on a straight-line basis over the estimated useful life of the improvement or the term of the lease, whichever is shorter. Certain costs of software developed or obtained for internal use are capitalized and amortized over the estimated useful life of the software. Expenditures for maintenance, repairs, and minor replacements are charged against earnings, as incurred. Expenditures that increase the value or productive capacity of assets are capitalized. When property and equipment are retired, sold, or otherwise disposed of, the asset's carrying amount and related accumulated depreciation are removed from the accounts and any gain or loss is included in earnings. Goodwill and Identifiable Intangible Assets Goodwill is the cost of acquired companies in excess of the fair value of identifiable net assets at acquisition date. In accordance with the Intangibles – Goodwill and Other Topic of the ASC, goodwill is tested for impairment on an annual basis at the fiscal year-end, and between annual tests if indicators of potential impairment exist, using a fair-value-based approach. No impairment of goodwill has been identified during any of the periods presented. Identifiable intangible assets subject to amortization are amortized using the straight-line method over their estimated period of benefit, ranging from two to twenty years. Identifiable intangible assets are tested for impairment whenever events or changes in circumstances suggest that an asset’s or asset group’s carrying value may not be fully recoverable in accordance with the Intangibles – Goodwill and Other Topic of the ASC. Residual value is presumed to be zero. Identifiable intangible assets not subject to amortization are reviewed at each reporting period to reevaluate if the intangible asset’s useful life remains indefinite. Additionally, intangible assets not subject to amortization are tested annually for impairment at the fiscal year-end, and between annual tests if indicators of potential impairment exist, using a fair-value-based approach. See Note 9 for discussion of impairments of intangible assets that have been identified during the fiscal year ended September 30, 2012. Financial Instruments and Derivatives Financial instruments owned and sold, not yet purchased, at fair value consist of financial instruments carried at fair value or amounts that approximate fair value, with related unrealized changes in gains or losses recognized in earnings, except for securities classified as available-for-sale. The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties, other than in a forced or liquidation sale. The Company accounts for its securities pledged on behalf of customers and proprietary securities in accordance with the Investments - Debt and Equity Securities Topic in the ASC. In accordance with this guidance, the Company determines the appropriate classification of its investments as trading, available-for-sale, or held-to-maturity at the time of purchase and reevaluates the designation as of each reporting period. The Company has classified certain U.S. government obligations, corporate debt securities and exchange firm common stock not pledged for clearing purposes as available-for-sale, which are carried at fair value based on observable or quoted market prices and associated unrealized gains or losses are recorded as a component of OCI, net of tax, until realized, unless an unrealized loss is determined to be other than temporary, in which case such loss is charged to earnings. The Company classifies those securities as available-for-sale because it would consider selling them prior to maturity to meet liquidity needs or as part of the Company’s risk management program. The Company computes the cost of its securities on a specific identification basis. Such cost includes the direct costs to acquire securities, adjusted for the amortization of any discount or premium. The amortized cost of securities is computed under the effective-interest method and is included in interest income. Realized gains and losses, declines in value judged to be other than temporary and interest on available-for-sale securities are included in earnings. Investment in managed funds, at fair value represents investments in funds managed by the Company’s fund managers. The investments are valued at period-end at the net asset value provided by the fund’s administrator. Commodities warehouse receipts are valued at the cash price for the commodity based on published market quotes. For commodities warehouse receipts, the change in fair value is offset against the payable to customers with no impact on the consolidated income statements. The Company utilizes derivative instruments to manage exposures to foreign currency, commodity price and interest rate risks for the Company and its customers. The Company’s objectives for holding derivatives include reducing, eliminating, and efficiently managing the economic impact of these exposures as effectively as possible. Derivative instruments are recognized as either assets or liabilities and are measured at fair value. The accounting for changes in the fair value of a derivative depends on the intended use of the derivative and the resulting designation. For a derivative instrument designated as a cash flow hedge, the effective portion of the derivative’s gain or loss is initially recorded in OCI, net of tax, and is subsequently recognized in earnings when the hedged exposure affects earnings. The ineffective portion of the gain or loss is recognized in earnings. Gains and losses from changes in fair values of derivatives that are not designated as cash flow hedges for accounting purposes are recognized in earnings. The Company’s derivative contracts consist of exchange-traded and OTC derivatives. Fair values of exchange-traded derivatives are generally determined from quoted market prices. OTC derivatives are valued using valuation models. The valuation models used to derive the fair values of OTC derivatives require inputs including contractual terms, market prices, yield curves and measurements of volatility. The Company uses similar models to value similar instruments. Where possible, the Company verifies the values produced by pricing models by comparing them to market transactions. Inputs may involve judgment where market prices are not readily available. The Company does not elect hedge accounting under the Derivatives and Hedging Topic of the ASC in accounting for derivatives used as economic hedges on its commodities. The Company provides clearing and execution of exchange-traded futures and options-on-futures for middle-market intermediaries, end-users, producers of commodities and the institutional and professional trader market segments. The Company has a subsidiary that is a registered futures commission merchant ("FCM"), clearing on various exchanges. The primary sources of revenues for the Company's FCM are commissions and clearing fees derived from executing and clearing orders for commodity futures contracts and options-on-futures on behalf of its customers. The Company also brokers foreign exchange forwards, options and cash, or spot, transactions between customers and external counterparties. A portion of the contracts are arranged on an offsetting basis, limiting the Company's risk to performance of the two offsetting parties. The offsetting nature of the contracts eliminates the effects of market fluctuations on the Company's operating results. Due to the Company's role as a principal participating in both sides of these contracts, the amounts are presented gross on the consolidated balance sheets at their respective fair values, net of offsetting assets and liabilities. In addition, the Company engages in speculative trading and holds proprietary positions in futures, options, swaps and forward derivatives, including corn, wheat, soybeans, sugar and foreign currency contracts. Since some of the derivatives held or sold by the Company are for speculative trading purposes, these derivative instruments are not designated as hedging instruments and accordingly, the changes in fair value during the period are recorded in the consolidated income statements as a component of 'trading gains, net' (see Note 4). The Company also holds proprietary positions in its foreign exchange line of business. On a limited basis, the Company's foreign exchange trade desk will accept a customer transaction and will offset that transaction with a similar but not identical position with a counterparty. These unmatched transactions are intended to be short-term in nature and are often conducted to facilitate the most effective transaction for the Company's customer. These spot and forward contracts are accounted for as free-standing derivatives and reported in the consolidated balance sheets at their fair values. The Company does not seek hedge accounting treatment for these derivatives, and accordingly, the changes in fair value during the period are recorded in the consolidated income statements within 'trading gains, net' (see Note 4). In applying the guidance in the Balance Sheet-Offsetting Topic of the ASC, the Company's accounting policy is such that open contracts with the same customer are netted at the account level, in accordance with netting arrangements in place with each party, as applicable and rights to reclaim cash collateral or obligations to return cash collateral are netted against fair value amounts recognized for derivative instruments with the same customer in accordance with the master netting arrangements in place with each customer. The Company may lease commodities to or from customers or counterparties, or advance commodities to customers on an unpriced basis, receiving payment when they become priced. These are valued at fair value utilizing the fair value option based on guidance within the Financial Instruments Topic of the ASC. The Company uses the fair value option to value these financial instruments since they are hybrid contracts with embedded derivative features that cannot be reliably measured and separated from the host contract. As permitted by the fair value option election, the entire instrument is recorded at fair value within the consolidated balance sheets as a component of 'financial instruments owned and sold, not yet purchased'. Due to the short term nature of the instruments, the balance of the agreements is not materially different than the recorded fair value. The corresponding change in fair value of the instrument is recognized within the consolidated income statements as a component of 'trading gains, net' for the fiscal years ended 2012, 2011 and 2010. The Company does elect to value all of their commodities lease agreements at fair value using the fair value option. See fair value measurements in Note 3. Exchange Memberships and Stock The Company is required to hold certain exchange membership seats and exchange firm common stock and pledge them for clearing purposes, in order to provide the Company the right to process trades directly with the various exchanges. Exchange memberships include seats on the Chicago Board of Trade ("CBOT"), the Board of Trade of Kansas City, Missouri, Inc. ("KCBT"), the Minnesota Grain Exchange, the New York Mercantile Exchange ("NYMEX"), the COMEX Division of the New York Mercantile Exchange, Mercado de Valores de Buenos Aires S.A. ("MERVAL"), the Chicago Mercantile Exchange ("CME") Growth and Emerging Markets, InterContinental Exchange, Inc. ("ICE") Futures US, ICE Europe Ltd and London Metal Exchange ("LME"). Exchange firm common stock include shares of CME Group, Inc., ICE and LME. In December 2012, the CME completed its acquisition of the KCBT. The Company expects to receive proceeds of $1.5 million and recognize a gain of $0.9 million before taxes, in connection with its class A shares of the KCBT held as of September 30, 2012, during the first quarter of fiscal year 2013. Exchange memberships and firm common stocks pledged for clearing purposes are recorded at cost, in accordance with U.S. GAAP and CFTC regulations and are included within 'other assets' on the consolidated balance sheets. Equity investments in exchange firm common stock not pledged for clearing purposes are classified as available-for-sale and recorded at fair value, with unrealized gains and losses recorded as a component of OCI, net of tax, until realized. Equity investments in exchange firm common stock not pledged for clearing purposes are included within 'financial instruments owned' on the consolidated balance sheets. The Company acquired shares of the LME during the year ended September 30, 2011 at a cost of $3.4 million. In January 2011, excess shares of exchange firm common stock, with a cost basis of $1.2 million, were sold, resulting in a nominal gain. In July 2011, the CME Group removed the requirement of its member firms to hold a specified quantity of its exchange firm common stock in order to process trades directly with the exchange. Since the shares of CME Group common stock are no longer pledged for clearing purposes, during the fiscal year ended September 30, 2011, the Company designated the shares as available-for-sale and recorded them at fair value within 'financial instruments owned' in the consolidated balance sheets. See Note 3 for additional discussion of equity investments in exchange firm common stock not pledged for clearing purposes. The cost basis for exchange memberships and firm common stock pledged for clearing purposes was $10.5 million and $10.3 million as of September 30, 2012 and 2011, respectively. The fair value of exchange memberships and firm common stock pledged for clearing purposes was $8.9 million and $10.5 million as of September 30, 2012 and 2011, respectively. The fair value of exchange firm common stock is determined by quoted market prices, and the fair value of exchange memberships is determined by recent sale transactions. The Company monitors the fair value of exchange membership seats and firm common stock on a quarterly basis, and does not consider any current unrealized losses on individual exchange memberships to be anything other than a temporary impairment. Commodity and Other Repurchase Agreements In the normal course of operations the Company accepts notes receivable under sale/repurchase agreements with customers whereby the customers sell certain commodity inventory or other investments and agree to repurchase the commodity inventory or investment at a future date at either a fixed or floating rate. These transactions are short-term in nature, and in accordance with the guidance contained in the Transfers and Servicing Topic of the ASC, are treated as secured borrowings rather than commodity inventory and purchases and sales in the Company’s consolidated financial statements. Additionally, the Company participates in transactions involving commodities or other investments sold under repurchase agreements (“repos”). In accordance with the guidance contained in the Transfers and Servicing Topic of the ASC, these transactions are treated as secured borrowings that are recorded as a liability in the consolidated balance sheets. Commodities or investments sold under repurchase agreements are reflected at the amount of cash received in connection with the transactions. The Company may be required to provide additional collateral based on the fair value of the underlying asset. Business Combinations Acquisitions during fiscal 2012 and 2011 are accounted for as business combinations in accordance with the provisions of the Business Combinations Topic of the ASC. Under this accounting guidance most of the assets and liabilities acquired and assumed are measured at fair value as of the acquisition date. Certain contingent liabilities acquired require remeasurement at fair value in each subsequent reporting period. Noncontrolling interests are initially measured at fair value and classified as a separate component of equity. Acquisition related costs, such as fees for attorneys, accountants, and investment bankers, are expensed as incurred and are not capitalized as part of the purchase price. For all acquisitions, regardless of the consummation date, deferred tax assets, valuation allowances, and uncertain tax position adjustments occurring after the measurement period are recorded as a component of income, rather than adjusted through goodwill. Determining the fair value of certain assets and liabilities acquired is subjective in nature and often involves the use of significant estimates and assumptions. Estimating the fair value of the assets and liabilities acquired requires significant judgment. Revenue Recognition Sales of physical commodities revenue are recognized when persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, and collectability is reasonably assured. The Company reports its physical commodities revenues on a gross basis, with the corresponding cost of sales shown separately, in accordance with the guidelines provided in the Revenue Recognition Topic of the ASC. Trading gains, net include brokerage fees and margins generated from OTC derivative trades executed with customers and other counterparties and are recognized when trades are executed. Trading gains, net also include activities where the Company acts as principal in the purchase and sale of individual securities, currencies, commodities or derivative instruments with customers. These transactions may be offset simultaneously with another customer or counterparty, offset with similar but not identical positions on an exchange, made from inventory, or may be aggregated with other purchases to provide liquidity intraday, for a number of days, or in some cases, particularly the base metals business, even longer periods (during which fair value may fluctuate). In addition, trading gains, net includes activities from the Company's operations of a proprietary foreign exchange desk which arbitrages the futures and cash markets (see additional discussion in the Financial Instruments and Derivatives policy note for revenue recognition on proprietary trading activities). Net dealer inventory and investment gains are recognized on a trade-date basis and include realized gains or losses and changes in unrealized gains or losses on investments at fair value. Dividend income and dividend expense, on short equity positions, are recognized net, within 'trading gain, net' on the ex-dividend date. Commissions on futures contracts are recognized on a half-turn basis in two equal parts. The first half is recognized when the contract is opened and the second half is recognized when the transaction is closed. Commissions on options-on-futures contracts are generally recognized on a half-turn basis, except that full commissions are recognized on options expected to expire without being exercised or offset. Commissions and fees are charged at various rates based on the type of account, the products traded, and the method of trade. Clearing and transaction fees are charged to customers on a per exchange contract basis based on the trade date. Such fees are for clearing customers’ exchange trades and include fees charged to the Company by the various futures exchanges. See discussion of clearing and related expenses below. Consulting and management fees include risk management consulting fees which are billed and recognized as revenue on a monthly basis when risk management services are provided. Such agreements are generally for one year periods, but are cancelable by either party upon providing thirty days written notice to the other party and the amounts are not variable based on customer trading activities. Asset management fees are recognized as they are earned based on fees due at each period-end date. These include performance fees based on the amount that is due under the formula for exceeding performance targets as of the period-end date. Fee income for structuring and arrangement of debt transactions and management and investment advisory income is recorded when the services related to the underlying transactions are provided and success fees are recorded when complete, as determined under the terms of the assignment or engagement. Interest income, generated primarily from investments and customer inventory financing, is recognized on an accrual basis. Interest from investments is generated from securities purchased using customer funds deposited with the Company to satisfy margin requirements, net of interest returned to customers, and from securities acquired through internally-generated company funds. Interest also includes unrealized gains and losses on securities owned and those deposited with other parties. Revenue generally is recognized net of any taxes collected from customers and subsequently remitted to governmental authorities. Cost of Revenue Cost of sales of physical commodities include finished commodity or raw material and processing costs along with operating costs relating to the receipt, storage and delivery of the physical commodities. Compensation and Benefits Compensation and benefits consists primarily of salaries, incentive compensation, commissions, related payroll taxes and employee benefits. The Company classifies employees as either traders / risk management consultants, operational or administrative personnel, which includes the executive officers. The most significant component of the Company’s compensation expense is the employment of the traders / risk management consultants, who are paid commissions based on the revenues that their customer portfolios generate. The Company accrues commission expense on a trade date basis. Share-Based Compensation The Company accounts for share-based compensation in accordance with the guidance of the Compensation-Stock Compensation Topic of the ASC. The cost of employee services received in exchange for a share-based award is generally measured based on the grant-date fair value of the award. Share-based employee awards that require future service are amortized over the relevant service period. Expected forfeitures are included in determining share-based employee compensation expense. In the first quarter of 2006, the Company adopted the guidance under the Compensation-Stock Compensation Topic of the ASC using the modified prospective method. For option awards granted subsequent to the adoption, compensation cost is recognized on a straight-line basis over the vesting period for the entire award. The expense of unvested option awards granted prior to the adoption are recognized on a straight-line basis, over the balance of the vesting period. Clearing and Related Expenses Clearing fees and related expenses include expenses for exchange-traded futures and options-on-futures clearing and settlement services, including fees the Company pays to the exchanges and the floor pit brokers. These fees are based on transaction volume, and recorded as expense on the trade date. Clearing fees are passed on to customers and are presented gross in the consolidated statements of income under the Revenue Recognition Topic of the ASC, as the Company acts as a principal for these transactions. Introducing Broker Commissions Introducing broker commissions include commissions paid to non-employee third parties that have introduced customers to the Company. Introducing brokers are individuals or organizations that maintain relationships with customers and accept futures and options orders from those customers. The Company directly provides all account, transaction and margining services to introducing brokers, including accepting money, securities and property from the customers. The commissions are determined and settled monthly. Income Taxes Income tax expense includes U.S. federal, state and local and foreign income taxes. Certain items of income and expense are not reported in tax returns and financial statements in the same year. The tax effect of such temporary differences is reported as deferred income taxes. Tax provisions are computed in accordance with the Income Taxes Topic of the ASC. Comprehensive Income Comprehensive income consists of net income and other gains and losses affecting stockholders’ equity that, under U.S. GAAP, are excluded from net income. Other comprehensive income (loss) includes net actuarial losses from defined benefit pension plans, unrealized gains and losses on available-for-sale securities, gains and losses on foreign currency translations, and changes in the fair value of interest rate swap agreements, to the extent they are, or previously were, effective as cash flow hedges. Noncontrolling Interest and Variable Interest Entities In accordance with the Consolidation Topic of the Accounting Standards Codification (“ASC”) the Company consolidates any variable interest entities for which it is the primary beneficiary, as defined. The Company applies the equity method of accounting when the Company does not have a controlling interest in an entity, but exerts significant influence over the entity. The Company had a majority interest in and was the general partner of the Blackthorn Multi-Advisor Fund, LP (the “Blackthorn Fund”), whose assets, liabilities, income and expenses were included within the Company's consolidated financial statements as of and for the years ended September 30, 2011 and 2010. The Blackthorn Fund is a commodity investment pool, which allocates most of its assets to third-party commodity trading advisors and other investment managers. The Blackthorn Fund engages in speculative trading of a wide variety of commodity futures and options-on-futures contracts, securities and other financial instruments. During 2012, the Company redeemed its remaining investment in Blackthorn Fund effective December 31, 2011. As a result of the final redemption, the Company no longer retains any ownership interests in the Blackthorn Fund, has transferred its rights as general partner and deconsolidated its interest in the Blackthorn Fund as of December 31, 2011. The aggregate of the redemption and remaining noncontrolling interest less the carrying amount of the net assets of the Blackthorn Fund resulted in a nominal gain and was recorded as a component of 'trading gains, net' in the consolidated income statement for the year ended September 30, 2012, as a result of the deconsolidation. The Blackthorn Fund had net assets of $3.2 million as of September 30, 2011. The net assets of the Blackthorn fund consisted of cash and cash equivalents of $17 thousand, deposits and receivables from broker-dealers, clearing organizations and counterparties of $2.6 million, investments in managed funds of $1.3 million, and accounts payable and other accrued liabilities of $0.7 million as of September 30, 2011. The noncontrolling interest shown in the consolidated balance sheet includes the noncontrolling interest of the Blackthorn Fund of $1.3 million as of September 30, 2011. See Note 3 for discussion of fair value of the financial assets and liabilities. Convertible Subordinated Notes The Company had $16.7 million in aggregate principal amount of the Company’s senior subordinated convertible notes due September 2011 (the "Notes") outstanding as of September 30, 2010. The Notes were general unsecured obligations of the Company and bore interest at the rate of 7.625% per annum, payable quarterly in arrears. During the fiscal year ended September 30, 2011, the Notes were converted along with accrued interest of $0.2 million into 778,703 shares of common stock of the Company. Preferred Stock The Company is authorized to issue one million shares of preferred stock, par value of $0.01 per share, in one or more classes or series to be established by the Company's board of directors. As of September 30, 2012 and 2011, no preferred shares were outstanding and the Company's board of directors had not yet established any class or series of shares. Recent Accounting Pronouncements In January 2010, new guidance was issued to require new disclosures and clarify existing disclosure requirements about fair value measurements as set forth in the Fair Value Measurements and Disclosures Topic in the ASC. The guidance requires that a reporting entity should disclose separately the amounts of transfers in and out of Level 1 and Level 2 fair value measurements and describe the reasons for the transfers; and in the reconciliation for fair value measurements using significant unobservable inputs, a reporting entity should present separately information about purchases, sales, issuances, and settlements. In addition, the guidance clarifies that for purposes of reporting fair value measurement for each class of assets and liabilities, a reporting entity needs to use judgment in determining the appropriate classes of assets and liabilities; and a reporting entity should provide disclosures about the valuation techniques and inputs used to measure fair value for both recurring and nonrecurring fair value measurements. This guidance was effective for the Company as of the first interim period beginning after December 15, 2009, except for the detailed level 3 roll forward disclosure, which is effective for fiscal years beginning after December 15, 2010. The Company adopted the requirements of the disclosures during the quarter ended March 31, 2010, except for the detailed level 3 roll forward disclosures. The Company adopted the detailed level 3 roll forward disclosures beginning with the first quarter ended December 31, 2011. The adoption of this guidance did not have a material impact on the Company's disclosures in its consolidated financial statements. In May 2011, the Financial Accounting Standards Board ("FASB") issued an update to the fair value measurement guidance to achieve common fair value measurement and disclosure requirements in U.S. GAAP and International Financial Reporting Standards ("IFRS"). The amendments in the update change the wording used to describe many of the requirements in U.S. GAAP for measuring fair value and for disclosing information about fair value measurements. The amendment is not intended to result in a change in the application of the requirements in the Fair Value Measurements Topic in the ASC. This guidance is effective for interim and annual periods beginning after December 15, 2011. The Company adopted this guidance in the second quarter of fiscal year 2012. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. In June 2011, the FASB issued new guidance on the presentation of comprehensive income. This guidance eliminates the current option to report comprehensive income and its components in the statement of changes in equity. Under this guidance, an entity can elect to present items of net income and comprehensive income in one continuous statement or in two separate, but consecutive, statements. In addition, the guidance requires entities to show the effects of items reclassified from accumulated other comprehensive loss to net income on the face of the financial statements. This guidance is effective for fiscal years beginning after December 15, 2011 and interim and annual periods thereafter. Early adoption is permitted, but full retrospective application is required. This guidance is effective for the Company's fiscal year beginning October 1, 2012 and all interim periods within that fiscal year. In December 2011, the FASB issued guidance that deferred the portion of the original guidance that required a company to separately present within net income reclassification adjustments of items out of accumulated other comprehensive loss. The deferral is intended to be temporary until the FASB has time to reconsider these changes. The other provisions of the guidance will become effective as originally planned by the FASB. The Company is expecting to adopt this guidance in the first quarter of fiscal year 2013. As the Company reports comprehensive income within its consolidated statements of stockholders' equity, the adoption of this guidance will result in a change in the presentation of comprehensive income in the Company's consolidated financial statements. In September 2011, the FASB issued amended guidance on goodwill impairment testing. Under the revised guidance, entities testing goodwill for impairment have the option of performing a qualitative assessment, whether it is more likely than not (a likelihood of more than 50%) that the fair value of a reporting unit is less than its carrying amount, before calculating the fair value of the reporting unit. Because the qualitative assessment is optional, entities may bypass it for any reporting unit in any period and begin their impairment analysis with the quantitative calculation in step 1. The guidance does not change how goodwill is calculated or assigned to reporting units, nor does it revise the requirement to test goodwill annually for impairment. In addition, the guidance does not amend the requirement to test goodwill for impairment between annual tests if events or circumstances warrant, however, it does revise the examples of events and circumstances that an entity should consider. The amended guidance is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted. The Company adopted this guidance at the beginning of fiscal year 2012.The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. On December 16, 2011, the FASB issued new guidance on the disclosures about offsetting assets and liabilities. While the FASB retained the existing offsetting models under U.S. GAAP, the new standard requires disclosures to allow investors to better compare and understand significant quantitative differences in financial statements prepared under U.S. GAAP. The new standard is effective for annual periods beginning after January 1, 2013, and interim periods within those annual periods. Retrospective application is required. This guidance is effective for the Company's fiscal year beginning October 1, 2013. The Company is expecting to adopt this guidance starting with the first quarter of fiscal year 2014. The adoption of this guidance is expected to change some of the Company's disclosures within the notes to the consolidated financial statements. In July 2012, the FASB issued final guidance on indefinite-lived intangible assets impairment testing. Under the guidance, entities testing indefinite-lived intangibles for impairment have the option of first performing a qualitative assessment to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired. If a company determines that it is more likely than not that the fair value of such an asset exceeds its carrying amount, it would not need to calculate the fair value of the asset in that year. However, if a company concludes otherwise, it must calculate the fair value of the asset, compare that value with its carrying amount and record an impairment charge, if any. The guidance does not revise the requirement to test indefinite-lived intangible assets annually for impairment. In addition, the guidance does not amend the requirement to test indefinite-lived intangible assets for impairment between annual tests if events or circumstances warrant, however, it does revise the examples of events and circumstances that an entity should consider. The guidance is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption is permitted. The Company is expecting to adopt this guidance for the impairment testing to be performed during the fiscal year ended September 30, 2013. It is expected that the adoption of this guidance will not have a material impact on the Company's consolidated financial statements.

Earnings per Share (Notes)

12 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

Earnings per Share

The Company presents basic and diluted earnings per share ("EPS") using the two-class method which requires all outstanding unvested share-based payment awards that contain rights to non-forfeitable dividends and therefore participate in undistributed earnings with common stockholders be included in computing earnings per share. Under the two-class method, net earnings are reduced by the amount of dividends declared in the period for each class of common stock and participating security. The remaining undistributed earnings are then allocated to common stock and participating securities, based on their respective rights to receive dividends. Restricted stock awards granted to certain employees and directors and shares held in trust for the Provident Group acquisition contain non-forfeitable rights to dividends at the same rate as common stock, and are considered participating securities.

Basic EPS has been computed by dividing net income by the weighted-average number of common shares outstanding. The following is a reconciliation of the numerator and denominator of the diluted net income per share computations for the periods presented below.



	Year Ended September 30,
(in millions, except share amounts)	2012			2011			2010
Numerator:
Income from continuing operations attributable to INTL FCStone Inc. stockholders	$	15.0		$	37.1		$	11.8
Less: Allocation to participating securities	(0.6		)	(0.9		)	(0.2		)
Income from continuing operations allocated to common stockholders	$	14.4		$	36.2		$	11.6
Income from discontinued operations	$	—		$	0.2		$	0.6
Less: Allocation to participating securities	—			—			—
Income from discontinued operations allocated to common stockholders	$	—		$	0.2		$	0.6
Extraordinary loss	$	—		$	—		$	(7.0	)
Less: Allocation to participating securities	—			—			0.1
Extraordinary loss allocated to common stockholders	$	—		$	—		$	(6.9	)
Diluted net income	$	15.0		$	37.3		$	5.4
Less: Allocation to participating securities	(0.6		)	(0.9		)	(0.1		)
Diluted net income allocated to common stockholders	$	14.4		$	36.4		$	5.3
Denominator:
Weighted average number of:
Common shares outstanding	18,282,939			17,618,085			17,306,019
Dilutive potential common shares outstanding:
Share-based awards	873,960			949,369			577,214
Diluted weighted-average shares	19,156,899			18,567,454			17,883,233

The dilutive effect of share-based awards is reflected in diluted net income per share by application of the treasury stock method, which includes consideration of unamortized share-based compensation expense required under the Compensation – Stock Compensation Topic of the ASC.

Options to purchase 1,157,601, 386,031 and 815,066 shares of common stock for fiscal years ended 2012, 2011 and 2010, respectively, were excluded from the calculation of diluted earnings per share because they would have been anti-dilutive.

Assets and Liabilities, at Fair Value (Notes)

12 Months Ended

Sep. 30, 2012

Assets and Liabilities, at Fair Value [Abstract]

Fair Value Disclosures [Text Block]

Assets and Liabilities, at Fair Value

The Company’s financial and nonfinancial assets and liabilities reported at fair value are included within the following captions on the consolidated balance sheets:


•	Cash and cash equivalents


•	Cash, securities and other assets segregated under federal and other regulations


•	Deposits and receivables from exchange-clearing organizations, broker-dealers, clearing organizations and counterparties


•	Financial instruments owned


•	Accounts payable and other accrued liabilities


•	Payables to customers


•	Payables to broker-dealers, clearing organizations and counterparties


•	Financial instruments sold, not yet purchased

Fair Value Hierarchy

As required by the Fair Value Measurements and Disclosures Topic of the ASC, financial and nonfinancial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). A market is active if there are sufficient transactions on an ongoing basis to provide current pricing information for the asset or liability, pricing information is released publicly, and price quotations do not vary substantially either over time or among market makers. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the reporting entity. The guidance requires the Company to consider counterparty credit risk of all parties to outstanding derivative instruments that would be considered by a market participant in the transfer or settlement of such contracts (exit price). The Company's exposure to credit risk on derivative financial instruments relates to the portfolio of OTC derivative contracts as all exchange-traded contracts held can be settled on an active market with the credit guarantee by the respective exchange. The Company requires each counterparty to deposit margin collateral for all OTC instruments and is also required to deposit margin collateral with counterparties. The Company has assessed the nature of these deposits and used its discretion to adjust each based on the underlying credit considerations for the counterparty and determined that the collateral deposits minimize the exposure to counterparty credit risk in the evaluation of the fair value of OTC instruments as determined by a market participant.

The majority of financial assets and liabilities on the consolidated balance sheets are reported at fair value. Cash is reported at the balance held at financial institutions. Cash equivalents includes money market funds, which are valued at period-end at the net asset value provided by the fund’s administrator, and certificates of deposit, which are stated at cost plus accrued interest, which approximates fair value. Cash, securities and other assets segregated under federal and other regulations include the value of cash collateral as well as the value of other pledged investments, primarily U.S. Treasury bills and obligations issued by government sponsored entities and commodities warehouse receipts. Deposits with and receivables from exchange-clearing organizations and broker-dealers, clearing organizations and counterparties and payables to customers and broker-dealers, clearing organizations and counterparties include the value of cash collateral as well as the value of money market funds and other pledged investments, primarily U.S. Treasury bills and obligations issued by government sponsored entities and mortgage-backed securities. These balances also include the fair value of exchange-traded futures and options-on-futures and exchange-cleared swaps and options determined by prices on the applicable exchange. Financial instruments owned and sold, not yet purchased include the value of U.S. and foreign government obligations, corporate debt securities, derivative financial instruments, commodities, mutual funds and investments in managed funds. The fair value of exchange common stock is determined by quoted market prices, and the fair value of exchange memberships is determined by recent sale transactions. The shares of the LME held by the Company were valued based on the proposed sale price of the ordinary shares, in connection with the sale of the LME to the Hong Kong Exchanges & Clearing Limited. Notes payable and subordinated debt carry variable rates of interest and thus approximate fair value.

The fair value estimates presented herein are based on pertinent information available to management as of September 30, 2012 and 2011. Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

Cash equivalents, securities, commodities warehouse receipts, derivative financial instruments and contingent liabilities are carried at fair value, on a recurring basis, and are classified and disclosed into three levels within the fair value hierarchy. The Company did not have any fair value adjustments for assets or liabilities measured at fair value on a non-recurring basis during the years ended September 30, 2012 and 2011. The three levels of the fair value hierarchy under the Fair Value Measurements and Disclosures Topic of the ASC are:

Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 1 consists of financial assets and liabilities whose fair values are estimated using quoted market prices. Included in Level 1 are money market funds, certificates of deposit, commodities warehouse receipts, common stock and ADRs, some U.S. and foreign obligations, equity investments in exchange firms, some mutual funds, as well as futures and options-on-futures contracts traded on national exchanges, exchange-cleared swaps and options which are valued using exchange closing prices, and OTC swaps and options contracts using quoted prices from national exchanges in which the Company executes transactions for customer and proprietary accounts;

Level 2 - Quoted prices for identical or similar assets or liabilities in markets that are less active, that is, markets in which there are few transactions for the asset or liability that are observable for substantially the full term. Included in Level 2 are those financial assets and liabilities for which fair values are estimated using models or other valuation methodologies. These models are primarily industry-standard models that consider various observable inputs, including time value, yield curve, volatility factors, observable current market and contractual prices for the underlying financial instruments, as well as other relevant economic measures. Included in Level 2 are U.S. and foreign government obligations, mortgage-backed securities, some common stock and American Depositary Receipts ("ADRs"), corporate and municipal bonds, some mutual funds, investments in managed funds and OTC forwards, swaps, and options; and

Level 3 - Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). Level 3 comprises financial assets and liabilities whose fair value is estimated based on internally developed models or methodologies utilizing significant inputs that are not readily observable from objective sources. Included in Level 3 are common stock and ADRs, some corporate and municipal bonds, some other investments and contingent liabilities.

The following tables set forth the Company’s financial and nonfinancial assets and liabilities accounted for at fair value, on a recurring basis, as of September 30, 2012 and September 30, 2011 by level within the fair value hierarchy. There were no assets or liabilities that were measured at fair value on a nonrecurring basis as of September 30, 2012 and 2011.



	September 30, 2012
(in millions)	Level 1		Level 2		Level 3		Netting and Collateral (1)			Total
Assets:
Money market funds	$	0.1	$	—	$	—	$	—		$	0.1
Certificate of deposits	10.4		—		—		—			10.4
Unrestricted cash equivalents	10.5		—		—		—			10.5
Commodities warehouse receipts	22.3		—		—		—			22.3
U.S. government obligations	—		50.5		—		—			50.5
Securities and other assets segregated under federal and other regulations	22.3		50.5		—		—			72.8
Money market funds	335.1		—		—		—			335.1
U.S. government obligations	—		1,318.3		—		—			1,318.3
Mortgage-backed securities	—		7.0		—		—			7.0
Derivatives	3,344.3		—		—		(3,494.7		)	(150.4		)
Deposits and receivables from exchange-clearing organizations	3,679.4		1,325.3		—		(3,494.7		)	1,510.0
Deposits and receivables from broker-dealers, clearing organizations and counterparties - derivatives	0.7		5.0		—		(6.4		)	(0.7		)
Common and preferred stock and American Depositary Receipts ("ADRs")	17.8		5.6		0.9		—			24.3
Exchangeable foreign ordinary equities and ADRs	10.0		—		—		—			10.0
Corporate and municipal bonds	0.3		0.6		3.6		—			4.5
U.S. government obligations	—		0.3		—		—			0.3
Foreign government obligations	14.8		—		—		—			14.8
Derivatives	315.6		785.3		—		(1,047.0		)	53.9
Commodities leases	—		135.2		—		(93.1		)	42.1
Commodities warehouse receipts	7.5		—		—		—			7.5
Exchange firm common stock	3.4		9.0		—		—			12.4
Mutual funds and other	1.9		—		—		—			1.9
Financial instruments owned	371.3		936.0		4.5		(1,140.1		)	171.7
Total assets at fair value	$	4,084.2	$	2,316.8	$	4.5	$	(4,641.2	)	$	1,764.3
Liabilities:
Accounts payable and other accrued liabilities - contingent liabilities	$	—	$	—	$	14.8	$	—		$	14.8
Payables to customers - derivatives	3,562.3		—		—		(3,562.3		)	—
Common and preferred stock and ADRs	16.4		5.9		—		—			22.3
Exchangeable foreign ordinary equities and ADRs	5.7		—		—		—			5.7
Derivatives	338.1		775.2		—		(1,068.7		)	44.6
Commodities leases	—		220.0		—		(117.2		)	102.8
Financial instruments sold, not yet purchased	360.2		1,001.1		—		(1,185.9		)	175.4
Total liabilities at fair value	$	3,922.5	$	1,001.1	$	14.8	$	(4,748.2	)	$	190.2


(1)	Represents cash collateral and the impact of netting across the levels of the fair value hierarchy. Netting among positions classified within the same level are included in that level.



	September 30, 2011
(in millions)	Level 1		Level 2		Level 3		Netting and Collateral (1)			Total
Assets:
Money market funds	$	0.1	$	—	$	—	$	—		$	0.1
Certificate of deposits	12.6		—		—		—			12.6
Unrestricted cash equivalents	12.7		—		—		—			12.7
Commodities warehouse receipts	19.0		—		—		—			19.0
U.S. government obligations	—		3.7		—		—			3.7
Securities and other assets segregated under federal and other regulations	19.0		3.7		—		—			22.7
Money market funds	1,193.5		—		—		—			1,193.5
U.S. government obligations	—		470.5		—		—			470.5
Mortgage-backed securities	—		8.5		—		—			8.5
Derivatives	7,227.4		—		—		(7,491.7		)	(264.3		)
Deposits and receivables from exchange-clearing organizations	8,420.9		479.0		—		(7,491.7		)	1,408.2
U.S. government obligations	—		0.1		—		—			0.1
Derivatives	47.3		1,073.5		—		(1,104.7		)	16.1
Deposits and receivables from broker-dealers, clearing organizations and counterparties	47.3		1,073.6		—		(1,104.7		)	16.2
Common and preferred stock and ADRs	45.6		0.2		1.1		—			46.9
Exchangeable foreign ordinary equities and ADRs	7.8		2.0		—		—			9.8
Corporate and municipal bonds	—		5.1		3.6		—			8.7
U.S. government obligations	—		0.8		—		—			0.8
Foreign government obligations	5.8		0.9		—		—			6.7
Derivatives	210.5		557.6		—		(666.2		)	101.9
Commodities leases	—		66.3		—		(40.2		)	26.1
Commodities warehouse receipts	16.2		—		—		—			16.2
Exchange firm common stock	3.0		0.7		—		—			3.7
Mutual funds and other	0.6		—		0.4		—			1.0
Investment in managed funds	—		1.3		—		—			1.3
Financial instruments owned	289.5		634.9		5.1		(706.4		)	223.1
Total assets at fair value	$	8,789.4	$	2,191.2	$	5.1	$	(9,302.8	)	$	1,682.9
Liabilities:
Accounts payable and other accrued liabilities - contingent liabilities	$	—	$	—	$	22.3	$	—		$	22.3
Payables to customers - derivatives	6,234.7		—		—		(6,234.7		)	—
Common and preferred stock and ADRs	23.4		—		—		—			23.4
Exchangeable foreign ordinary equities and ADRs	21.5		2.3		—		—			23.8
Derivatives	219.9		1,679.1		—		(1,776.1		)	122.9
Commodities leases	—		431.9		—		(211.1		)	220.8
Financial instruments sold, not yet purchased	264.8		2,113.3		—		(1,987.2		)	390.9
Total liabilities at fair value	$	6,499.5	$	2,113.3	$	22.3	$	(8,221.9	)	$	413.2


(1)	Represents cash collateral and the impact of netting across the levels of the fair value hierarchy. Netting among positions classified within the same level are included in that level.

Realized and unrealized gains and losses are included within ‘trading gains, net’ in the consolidated income statements.

Information on Level 3 Financial Assets and Liabilities

The Company’s financial assets at fair value classified within level 3 of the fair value hierarchy as of September 30, 2012 and 2011 are summarized below:



(in millions)	September 30, 2012			September 30, 2011
Total level 3 assets	$	4.5		$	5.1
Level 3 assets for which the Company bears economic exposure	$	4.5		$	5.1
Total assets	$	2,958.9		$	2,635.7
Total financial assets at fair value	$	1,764.3		$	1,682.9
Total level 3 assets as a percentage of total assets	0.2		%	0.2		%
Level 3 assets for which the Company bears economic exposure as a percentage of total assets	0.2		%	0.2		%
Total level 3 assets as a percentage of total financial assets at fair value	0.3		%	0.3		%

The following tables set forth a summary of changes in the fair value of the Company’s level 3 financial assets and liabilities during the fiscal years ended September 30, 2012 and 2011, including a summary of unrealized gains (losses) during the fiscal year ended on the Company’s level 3 financial assets and liabilities still held as of September 30, 2012.



	Level 3 Financial Assets and Financial Liabilities For the Year Ended September 30, 2012
(in millions)	Balances at beginning of period		Realized gains (losses) during period			Unrealized gains (losses) during period			Purchases/ issuances		Settlements			Transfers in or (out) of Level 3		Balances at end of period
Assets:
Common and preferred stock and ADRs	$	1.1	$	—		$	(0.2	)	$	—	$	—		$	—	$	0.9
Corporate and municipal bonds	3.6		—			—			—		—			—		3.6
Mutual funds and other	0.4		(0.4		)	—			—		—			—		—
	$	5.1	$	(0.4	)	$	(0.2	)	$	—	$	—		$	—	$	4.5
Liabilities:
Contingent liabilities	$	22.3	$	—		$	2.0		$	0.1	$	(9.6	)	$	—	$	14.8



	Level 3 Financial Assets and Financial Liabilities For the Year Ended September 30, 2011
(in millions)	Balances at beginning of period		Realized gains (losses) during period		Unrealized gains (losses) during period			Purchases/ issuances		Settlements			Transfers in or (out) of Level 3		Balances at end of period
Assets:
Common and preferred stock and ADRs	$	1.2	$	—	$	(0.1	)	$	—	$	—		$	—	$	1.1
Corporate and municipal bonds	8.0		—		(1.7		)	—		(2.7		)	—		3.6
Mutual funds and other	0.4		—		—			—		—			—		0.4
Investment in managed funds	0.6		0.2		—			—		(0.8		)	—		—
	$	10.2	$	0.2	$	(1.8	)	$	—	$	(3.5	)	$	—	$	5.1
Liabilities:
Contingent liabilities	$	32.3	$	—	$	(2.9	)	$	2.3	$	(9.4	)	$	—	$	22.3

In August 2008, INTL Asia Pte, Ltd., a subsidiary of the Company, arranged a 550 million Thai Baht ("THB"), an $18 million U.S. dollar ("USD") equivalent, issue of debentures for the single asset owning company of Suriwongse Hotel located in Chiang Mai, Thailand. The debentures have a 9.5% coupon and were scheduled to mature in August 2011. The Company arranged for the sale of 375.5 million THB ($12.6 million USD) of the debentures to two investors and the Company retained debentures in the amount of 174.5 million THB ($5.4 million USD). The debentures were secured by a mortgage on the land and hotel buildings, the personal guarantee of the owner, and conditional assignments of accounts and agreements.

The proceeds of this issue were to be used to refinance the previous loan to the hotel owner, finance the hotel's renovation and fund interest up to 50.0 million THB. Renovations were initially planned to be completed by April 2011 and the outstanding debentures were to be refinanced following the completion of renovations.

In addition, the political and economic conditions in Thailand over the past two years have impacted the performance of the hotel. Following the interest capitalization period, the hotel owner was able to meet four quarterly interest payments on the debentures, however the hotel owner defaulted on the interest payment that was due in March 2011. The Company and other debenture holders have exercised their rights under the share pledge provisions of the debentures, and held a share auction of 100% of the shares of the single asset owning company. The debenture holders won the share auction and the previous owner, who is also a personal guarantor of the debentures, has filed a complaint to revoke the completed auction. The Company intends to vigorously defend actions taken in its capacity as a debenture holder. Judgment in the lawsuit filed by the previous owner is expected during the first quarter of 2013.

In accordance with the Fair Value Measurements and Disclosures Topic of the ASC, the Company has estimated the fair value of the debentures on a recurring basis each period. As of September 30, 2012, the Company's investment in the hotel is $3.6 million, and included within the corporate and municipal bonds classification in the level 3 financial assets and financial liabilities tables. The Company has classified its investment in the hotel within level 3 of the fair value hierarchy because the fair value is determined using significant unobservable inputs, which include projected cash flows. These cash flows are discounted employing present value techniques. During the year ended September 30, 2011, the Company recorded a loss of $1.7 million, representing an other than temporary impairment. The Company continues to monitor the hotel renovation process and evaluate the fair value of the debentures. There has been no significant change in the fair value of the debentures, and no additional loss has been recognized during the year ended September 30, 2012.

The Company is required to make additional future cash payments based on certain financial performance measures of its acquired businesses. The Company is required to remeasure the fair value of the cash earnout arrangements on a recurring basis in accordance with the guidance in the Business Combinations Topic of the ASC. The Company has classified its liabilities for the contingent earnout arrangements within level 3 of the fair value hierarchy because the fair value is determined using significant unobservable inputs, which include projected cash flows. The estimated fair value of the contingent purchase consideration is based upon management-developed forecasts, a level 3 input in the fair value hierarchy. These cash flows are discounted employing present value techniques in arriving at the acquisition-date fair value. The discount rate was developed using market participant company data, a level 2 input in the fair value hierarchy, and there have been no significant changes in the discount rate environment. From the dates of acquisition to September 30, 2012, certain acquisitions have had changes in the estimates of undiscounted cash flows, based on actual performances fluctuating from estimates. During the fiscal year ended September 30, 2012, the fair value of the contingent consideration increased $2.0 million, with the corresponding expense classified as 'other' within the consolidated income statements.

The Company reports transfers in and out of levels 1, 2 and 3, as applicable, using the fair value of the securities as of the beginning of the reporting period in which the transfer occurred. The Company did not have any transfers between level 1 and level 2 fair value measurements for the year ended September 30, 2012.

The value of an exchange-traded derivative contract is equal to the unrealized gain or loss on the contract determined by marking the contract to the current settlement price for a like contract on the valuation date of the contract. A settlement price may not be used if the market makes a limit move with respect to a particular derivative contract or if the securities underlying the contract experience significant price fluctuations after the determination of the settlement price. When a settlement price cannot be used, derivative contracts will be valued at their fair value as determined in good faith pursuant to procedures adopted by management of the Company.

On June 30, 2011, the commodities market experienced downward limit price movements on certain commodities, and on March 31, 2011, the commodities market experienced upward limit price movements on certain commodities. As a result, certain exchange-traded derivative contracts, which would normally be valued using quoted market prices and classified as level 1 within the fair value hierarchy, were priced using a valuation model using observable inputs. Due to the change in valuation techniques because of the limit moves, some derivative assets and derivative liabilities were transferred from level 1 and classified as level 2 during the year ended September 30, 2011. Such derivative assets and liabilities were valued using quoted market prices prior to March 31, 2011 and as of September 30, 2011 and as such, were classified as level 1. There were no significant similiar occurrences of upward or downward limit price movements during the year ended September 30, 2012 and the derivative assets and liabilities were valued using quoted market prices as of the respective quarter ends in fiscal year 2012 and as such were classified as level 1.

The Company has recorded unrealized gains of $90 thousand, net of income tax expense of $53 thousand related to U.S. government obligations and corporate bonds classified as available-for-sale securities in OCI as of September 30, 2012. The following tables summarize the amortized cost basis, the aggregate fair value and gross unrealized holding gains and losses of the Company’s investment securities classified as available-for-sale as of September 30, 2012 and September 30, 2011:



September 30, 2012
Amounts included in deposits with and receivables from exchange-clearing organizations:
	Amortized Cost		Unrealized Holding ⁽¹⁾				Estimated Fair Value
(in millions)	Amortized Cost		Gains		(Losses)		Estimated Fair Value
U.S. government obligations	$	1,298.9	$	—	$	—	$	1,298.9
Mortgage-backed securities	6.8		0.1		—		6.9
	$	1,305.7	$	0.1	$	—	$	1,305.8


(1)	Unrealized gain/loss on U.S. government obligations as of September 30, 2012, is less than 0.1 million .



September 30, 2011
Amounts included in financial instruments owned:
	Amortized Cost		Unrealized Holding ⁽¹⁾				Estimated Fair Value
(in millions)	Amortized Cost		Gains		(Losses)		Estimated Fair Value
U.S. government obligations	$	0.5	$	—	$	—	$	0.5
Corporate bonds	5.0		—		—		5.0
	$	5.5	$	—	$	—	$	5.5


(1)	Unrealized gain/loss on financial instruments owned as of September 30, 2011, is less than $0.1 million.



Amounts included in deposits with and receivables from exchange-clearing organizations:
	Amortized Cost		Unrealized Holding				Estimated Fair Value
(in millions)	Amortized Cost		Gains		(Losses)		Estimated Fair Value
U.S. government obligations	$	440.6	$	0.1	$	—	$	440.7
Mortgage-backed securities	8.3		0.2		—		8.5
	$	448.9	$	0.3	$	—	$	449.2

As of September 30, 2012 and September 30, 2011, investments in debt securities classified as available-for-sale (AFS) mature as follows:



September 30, 2012
	Due in				Estimated Fair Value
(in millions)	Less than 1 year		1 year or more		Estimated Fair Value
U.S. government obligations	$	1,298.9	$	—	$	1,298.9
Mortgage-backed securities	—		6.9		6.9
	$	1,298.9	$	6.9	$	1,305.8



September 30, 2011
	Due in				Estimated Fair Value
(in millions)	Less than 1 year		1 year or more		Estimated Fair Value
U.S. government obligations	$	441.2	$	—	$	441.2
Corporate bonds	5.0		—		5.0
Mortgage-backed securities	—		8.5		8.5
	$	446.2	$	8.5	$	454.7

There were no sales of AFS Securities during years ended September 30, 2012 and September 30, 2011, and as a result, no realized gains or losses were recorded for the years ended September 30, 2012 and September 30, 2011.

For the purposes of the maturity schedule, mortgage-backed securities, which are not due at a single maturity date, have been allocated over maturity groupings based on the expected maturity of the underlying collateral. Mortgage-backed securities may mature earlier than their stated contractual maturities because of accelerated principal repayments of the underlying loans.

The Company has also classified equity investments in exchange firms' common stock not pledged for clearing purposes as available-for-sale. The investments are recorded at fair value, with unrealized gains and losses recorded, net of taxes, as a component of OCI until realized. As of September 30, 2012, the cost and fair value of the equity investments in exchange firms is $4.4 million and $12.4 million, respectively. As of September 30, 2011, the cost and fair value of the equity investments in exchange firms is $4.4 million and $3.7 million, respectively.

On June 15, 2012, London Metal Exchange Holdings Limited, the parent company of the LME, entered into a framework agreement regarding the terms of a recommended cash offer for the entire issued and outstanding ordinary share capital of LME Holdings. On July 23, 2012, the shareholders of LME Holdings voted to approve the sale of the LME to the Hong Kong Exchanges & Clearing Limited. Based on the proposed sale price of the ordinary shares, the shares of the LME held by the Company were valued at $8.7 million as of September 30, 2012. The shares held by the Company, that have been designated as available-for-sale, reflect an unrealized gain of $6.3 million net of income tax expense of $2.0 million. This gain is recorded in OCI as of September 30, 2012. In late November 2012, the Financial Services Authority approved the change of ownership of the LME. The Company expects to collect payment for the sale of their shares and to reclassify the unrealized gain in accumulated OCI and recognize the realized gain in earnings in the first quarter of fiscal year 2013.

The Company has recorded unrealized losses of $0.3 million, net of income tax benefit of $0.1 million in OCI related to remaining equity investments in exchange firms as of September 30, 2012. The Company has recorded unrealized losses of $0.4 million, net of income tax benefit of $0.3 million in OCI related to equity investments in exchange firms as of September 30, 2011. The Company monitors the fair value of exchange common stock on a periodic basis, and does not consider any current unrealized losses to be anything other than temporary impairment.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 133
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Statement of Financial Accounting Standard (FAS)
-Number 107
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk (Notes)

12 Months Ended

Sep. 30, 2012

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract]

Derivative Instruments and Hedging Activities Disclosure [Text Block]

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk

The Company is party to certain financial instruments with off-balance sheet risk in the normal course of its business. The Company has sold financial instruments that it does not currently own and will therefore be obliged to purchase such financial instruments at a future date. The Company has recorded these obligations in the consolidated financial statements as of September 30, 2012 at the fair values of the related financial instruments. The Company will incur losses if the fair value of the underlying financial instruments increases subsequent to September 30, 2012. The total of $175.4 million as of September 30, 2012 includes $44.6 million for derivative contracts, which represent a liability to the Company based on their fair values as of September 30, 2012.

Derivatives

The Company utilizes derivative products in its trading capacity as a dealer in order to satisfy client needs and mitigate risk. The Company manages risks from both derivatives and non-derivative cash instruments on a consolidated basis. The risks of derivatives should not be viewed in isolation, but in aggregate with the Company’s other trading activities. The majority of the Company’s derivative positions are included in the consolidating balance sheets within ‘financial instruments owned, at fair value’, ‘deposits and receivables from exchange-clearing organizations’ and ‘financial instruments sold, not yet purchased, at fair value’.

The Company continues to employ an interest rate risk management strategy that uses derivative financial instruments in the form of interest rate swaps to manage a portion of the aggregate interest rate position. The Company’s objective is to invest the majority of customer segregated deposits in high quality, short-term investments and swap the resulting variable interest earnings into the medium-term interest stream, by using a strip of interest rate swaps that mature every quarter, in order to achieve the two year moving average of the two year swap rate. The risk mitigation of these interest rate swaps is not within the documented hedging designation requirements of the Derivatives and Hedging Topic of the ASC, and as a result they are recorded at fair value, with changes in the marked-to-market valuation of the financial instruments recorded within 'trading gains, net' in the consolidated income statements. At September 30, 2012 and 2011, the Company had $765.0 million and $1.1 billion in notional principal of interest rate swaps outstanding with a weighted-average life of 6 and 14 months, respectively.

Listed below are the fair values of the Company's derivative assets and liabilities as of September 30, 2012 and 2011. Assets represent net unrealized gains and liabilities represent net unrealized losses.



	September 30, 2012						September 30, 2011
(in millions)	Assets ⁽¹⁾			Liabilities ⁽¹⁾			Assets ⁽¹⁾			Liabilities ⁽¹⁾
Derivative contracts not accounted for as hedges:
Exchange-traded commodity derivatives	$	3,325.6		$	3,565.3		$	7,074.2		$	6,062.4
OTC commodity derivatives	823.6			841.4			763.7			780.1
Exchange-traded foreign exchange derivatives	63.0			47.7			126.9			89.8
OTC foreign exchange derivatives ⁽²⁾⁽³⁾	215.4			196.6			1,074.3			1,118.9
Exchange-traded interest rate derivatives	0.9			2.6			2.3			2.8
OTC interest rate derivatives	1.6			—			3.2			—
Equity index derivatives	20.8			22.0			71.7			79.7
Gross fair value of derivative contracts	4,450.9			4,675.6			9,116.3			8,133.7
Impact of netting and collateral	(4,548.1		)	(4,631.0		)	(9,262.6		)	(8,010.8		)
Total fair value included in ‘Deposits and receivables from exchange-clearing organizations’	$	(150.4	)				$	(264.3	)
Total fair value included in 'Deposits and receivables from broker-dealers, clearing organizations and counterparties'	$	(0.7	)				$	16.1
Total fair value included in ‘Financial instruments owned, at fair value’	$	53.9					$	101.9
Fair value included in ‘Financial instruments sold, not yet purchased, at fair value’				$	44.6					$	122.9


(1)	As of September 30, 2012 and 2011, the Company’s derivative contract volume for open positions was approximately 4.1 million and 3.9 million contracts, respectively.


(2)	In accordance with agreements with counterparties, the Company is allowed to periodically take advances against its open trade fair value. These amounts exclude advances against open trade fair value of $9.2 million and $0 outstanding as of September 30, 2012 and 2011, respectively.


(3)	In accordance with agreements with counterparties, the Company has to maintain a sufficient margin collateral balance based on the value of the open positions. These amounts exclude deposits with the counterparties for margin collateral, which are included in netting and collateral line, of $0 and $53.5 million as of September 30, 2012 and 2011, respectively.

The Company’s derivative contracts are principally held in its Commodities and Risk Management Services ("C&RM") segment. The Company assists its C&RM segment customers in protecting the value of their future production by entering into option or forward agreements with them on an OTC basis. The Company also provides its C&RM segment customers with option products, including combinations of buying and selling puts and calls. The Company mitigates its risk by generally offsetting the customer's transaction simultaneously with one of the Company's trading counterparties or will offset that transaction with a similar but not identical position on the exchange. The risk mitigation of these offsetting trades is not within the documented hedging designation requirements of the Derivatives and Hedging Topic of the ASC. These derivative contracts are traded along with cash transactions because of the integrated nature of the markets for these products. The Company manages the risks associated with derivatives on an aggregate basis along with the risks associated with its proprietary trading and market-making activities in cash instruments as part of its firm-wide risk management policies. In particular, the risks related to derivative positions may be partially offset by inventory, unrealized gains in inventory or cash collateral paid or received.

The following table sets forth the Company's net gains (losses) related to derivative financial instruments for the fiscal years ended September 30, 2012, 2011 and 2010, in accordance with the Derivatives and Hedging Topic of the ASC. The net gains (losses) set forth below are included within ‘trading gains, net’ in the consolidated income statements.



	Year Ended September 30,
(in millions)	2012		2011		2010
Commodities	$	65.7	$	34.1	$	(19.1	)
Foreign exchange	10.4		15.0		13.3
Interest rate	1.4		3.5		2.5
Net gains (losses) from derivative contracts	$	77.5	$	52.6	$	(3.3	)

Periodically, the Company uses interest rate swap contracts to hedge certain forecasted transactions. The Company’s primary objective in holding these types of derivatives is to reduce the volatility of earnings and cash flows associated with changes in interest rates. The Company had two interest rate swap contracts, each with a notional amount of $50 million, that matured during the fiscal year ended September 30, 2011. The interest rate swap contracts were entered into in order to hedge potential changes in cash flows resulting from the Company’s variable rate LIBOR based borrowings.

The interest rate swaps were initially classified under the Derivatives and Hedging Topic of the ASC as cash flow hedges. As a result of decreased borrowings by the Company in fiscal year 2010, it was determined that one of the interest rate swaps no longer met the criteria, specified under the Derivatives and Hedging Topic, to allow for the deferral of the effective portion of unrecognized hedging gains or losses in other comprehensive income or loss since all of the forecasted variable interest payments are not expected to occur. However, the Company expected that a portion of those forecasted transactions were still going to occur. As a result, the Company had a loss of $0.2 million, net of tax, as of December 31, 2010 remaining in accumulated other comprehensive income or loss relating to transactions that were still expected to occur for the discontinued hedge.

As of December 31, 2010, the remaining unrecognized loss relating to both interest rate swaps in accumulated other comprehensive income (loss) was $0.6 million, net of tax. That amount was expected to be recognized in earnings as the forecasted payments affected interest expense. However, at the end of the period ended March 31, 2011, the Company's borrowing levels again decreased significantly and it was determined that the one remaining swap, that was being classified as a cash flow hedge, no longer met the criteria for the deferral of the effective portion of unrecognized hedging gains or losses and the Company discontinued hedge accounting for the remaining swap. In addition, as the Company did not expect the borrowing levels to increase significantly before the swaps were due to mature, the remaining balances were recognized in earnings. The Company recognized a loss of $0.3 million, net of tax, for the fiscal year ended September 30, 2011, as a result of the discontinuation of hedge accounting which is included within ‘trading gains, net’ in the consolidated income statements.

Credit Risk

In the normal course of business, the Company purchases and sells financial instruments, commodities and foreign currencies as either principal or agent on behalf of its customers. If either the customer or counterparty fails to perform, the Company may be required to discharge the obligations of the nonperforming party. In such circumstances, the Company may sustain a loss if the fair value of the financial instrument or foreign currency is different from the contract value of the transaction.

The majority of the Company’s transactions and, consequently, the concentration of its credit exposure are with commodity exchanges, customers, broker-dealers and other financial institutions. These activities primarily involve collateralized and uncollateralized arrangements and may result in credit exposure in the event that a counterparty fails to meet its contractual obligations. The Company’s exposure to credit risk can be directly impacted by volatile financial markets, which may impair the ability of counterparties to satisfy their contractual obligations. The Company seeks to control its credit risk through a variety of reporting and control procedures, including establishing credit limits based upon a review of the counterparties’ financial condition and credit ratings. The Company monitors collateral levels on a daily basis for compliance with regulatory and internal guidelines and requests changes in collateral levels as appropriate.

The Company is a party to financial instruments in the normal course of its business through customer and proprietary trading accounts in exchange-traded and OTC derivative instruments. These instruments are primarily the execution of orders for commodity futures, options-on-futures and forward foreign currency contracts on behalf of its customers, substantially all of which are transacted on a margin basis. Such transactions may expose the Company to significant credit risk in the event margin requirements are not sufficient to fully cover losses which customers may incur. The Company controls the risks associated with these transactions by requiring customers to maintain margin deposits in compliance with individual exchange regulations and internal guidelines. The Company monitors required margin levels daily and, therefore, may require customers to deposit additional collateral or reduce positions when necessary. The Company also establishes credit limits for customers, which are monitored daily. The Company evaluates each customer’s creditworthiness on a case by case basis. Clearing, financing, and settlement activities may require the Company to maintain funds with or pledge securities as collateral with other financial institutions. Generally, these exposures to both customers and exchanges are subject to master netting, or customer agreements, which reduce the exposure to the Company by permitting receivables and payables with such customers to be offset in the event of a customer default. Management believes that the margin deposits held as of September 30, 2012 and September 30, 2011 were adequate to minimize the risk of material loss that could be created by positions held at that time. Additionally, the Company monitors collateral fair value on a daily basis and adjusts collateral levels in the event of excess market exposure. Generally, these exposures to both customers and counterparties are subject to master netting, or customer agreements which reduce the exposure to the Company.

Derivative financial instruments involve varying degrees of off-balance sheet market risk whereby changes in the fair values of underlying financial instruments may result in changes in the fair value of the financial instruments in excess of the amounts reflected in the consolidated balance sheets. Exposure to market risk is influenced by a number of factors, including the relationships between the financial instruments and the Company’s positions, as well as the volatility and liquidity in the markets in which the financial instruments are traded. The principal risk components of financial instruments include, among other things, interest rate volatility, the duration of the underlying instruments and changes in foreign exchange rates. The Company attempts to manage its exposure to market risk through various techniques. Aggregate market limits have been established and market risk measures are routinely monitored against these limits.

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Receivables from customers and notes receivable, net (Notes)

12 Months Ended

Sep. 30, 2012

Receivables from customers and notes receivable, net [Abstract]

Financing Receivables [Text Block]

Receivables From Customers, net and Notes Receivable, net

Receivables from customers, net and notes receivable, net include an allowance for bad debts, which reflects the Company's best estimate of probable losses inherent in the receivables from customers and notes receivable. The Company provides for an allowance for doubtful accounts based on a specific-identification basis. The Company continually reviews its allowance for bad debts. The allowance for doubtful accounts related to receivables from customers was $0.9 million and 11.8 million as of September 30, 2012 and 2011, respectively. The allowance for doubtful accounts related to notes receivable was $0.1 million as of September 30, 2012 and 2011, respectively.

During the year ended September 30, 2012, the Company recorded bad debt expense, net of recoveries, of $0.7 million, including provision increases and direct write-offs of $0.8 million, offset by recoveries of $0.1 million. The provision increases during 2012 were primarily related to customer deficits within the C&RM segment. During 2012, the Company charged-off receivables on consigned gold transactions of $8.5 million and CES customer deficits of $2.7 million, which were all fully reserved.

During the year ended September 30, 2011, the Company recorded bad debt expense, net of recoveries, of $4.5 million, including provision increases and direct write-offs of $8.2 million, offset by recoveries of $3.7 million. The provision increases during 2011 were primarily related to credit losses recognized on consigned gold transactions, within the C&RM segment, and a clearing customer deficit account within the CES segment. A portion of the loss on consigned gold related to a customer for which a partial provision was recorded during the fourth quarter of 2010. During 2011, negotiation efforts with the customer resulted in settlement of the loss in excess of the amount previously estimated and a charge to bad debt expense for the incremental uncollectible portion. During 2011, the Company recorded recoveries of $3.7 million of bad debt expense related to collection of a previous customer account deficit, within the C&RM segment, and collection following a settlement relating to a disputed trade, within the CES segment, that was “given-up” to FCStone, LLC during the quarter ended June 30, 2010 by another FCM, discussed further below.

During the year ended September 30, 2010, the Company recorded bad debt expense, net of recoveries, of $3.5 million, including provision increases and direct write-offs of $4.2 million, offset by recoveries of $0.7 million. The provision increases during 2010 included a recorded charge to bad debt expense of $2.3 million related to a disputed trade that was "given-up" to FCStone, LLC by another FCM for a customer that held an account with FCStone, LLC. Despite expressly informing the FCM that FCStone, LLC would not accept the "give-up" trade, the "give-up" trade was submitted through the electronic clearing process and erroneously cleared, generating a deficit in the customer's trading account. The customer lacked the financial capacity to cover the account deficit. Additionally, the Company recorded a $2.5 million charge to bad debt expense related to a Dubai customer to whom INTL Commodities DMCC had consigned gold.

As a result of the acquisition of FCStone, the Company acquired notes receivable of $133.7 million as of September 30, 2009 from certain customers and an introducing broker which arose from previous customer account deficits. At the time of the acquisition, the Company estimated collectability of these notes to be $16.7 million. During 2011, the Company recovered $15.6 million as partial payment against these notes, and charged off $111.5 million of note receivable which was fully reserved. Since the acquisition of FCStone, total recoveries from these customers and introducing broker through September 30, 2011 is $15.5 million, and remaining notes receivable related to these customer account deficits is $1.2 million. The Company expects to collect the remaining amounts from the introducing broker, by withholding commissions due on future revenues collected by the Company, although no assurance can be given as to the timing of collection.

Activity in the allowance for doubtful accounts and notes for the years ended September 30, 2012, 2011 and 2010 was as follows:



(in millions)	2012			2011			2010
Balance, beginning of year	$	11.9		$	119.2		$	123.4
Provision for bad debts	0.4			7.2			2.3
Transfer in ⁽¹⁾	—			2.5			—
Deductions:
Charge-offs	(11.2		)	(113.3		)	(5.8		)
Recoveries	(0.1		)	(3.7		)	(0.7		)
Balance, end of year	$	1.0		$	11.9		$	119.2

(1)

During the three months ended December 31, 2010, certain open position derivative contracts, which had a $2.5 million credit reserve as of September 30, 2010 were closed, and the deficit account balance was reclassified from financial instruments owned to a receivable from customer. Accordingly, the previously established credit reserve amount was transferred into the allowance for doubtful accounts during the three months ended December 31, 2010.

The Company originates short-term notes receivable from customers with the outstanding balances being insured 90% to 98% by a third party, including accrued interest. The total balance outstanding under insured notes receivable was $10.2 million as of September 30, 2012. The Company has sold $0.8 million of the insured portion of the notes through non-recourse participation agreements with other third parties.

See discussion of notes receivable related to commodity repurchase agreements in Note 13.

Physical Commodities Inventory (Notes)

12 Months Ended

Sep. 30, 2012

Physical Commodities Inventory [Abstract]

Inventory Disclosure [Text Block]

Physical Commodities Inventory

Commodities in process include commodities in the process of being recycled. As of September 30, 2012 and 2011, $129.1 million and $159.4 million, respectively, of physical commodities inventory served as collateral under certain of the Company’s credit facilities, as detailed further in Note 10. The carrying values of the Company’s inventory as of September 30, 2012 and 2011 are shown below.



(in millions)	September 30, 2012		September 30, 2011
Commodities in process	$	13.6	$	2.4
Finished commodities	118.0		158.2
Physical commodities inventory	$	131.6	$	160.6

As a result of declining market prices for some commodities towards the end of the fiscal year, the Company has recorded LCM adjustments for physical commodities inventory of $0.4 million and $21.9 million as of September 30, 2012 and 2011, respectively. The adjustments are included within 'cost of sales of physical commodities' in the consolidated income statements.

Property and Equipment, Net

12 Months Ended

Sep. 30, 2012

Property and Equipment, net [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

Property and Equipment, net

Property and equipment are stated at cost, and reported net of accumulated depreciation on the consolidated balance sheets. Depreciation on plant and equipment is calculated on the straight-line method over the estimated useful lives of the assets. The estimated useful lives of property and equipment range from 3 to 10 years. During the fiscal years ended September 30, 2012, 2011 and 2010, depreciation expense was $4.7 million, $2.4 million and $1.0 million, respectively.

A summary of property and equipment, at cost less accumulated depreciation as of September 30, 2012 and 2011 is as follows:



(in millions)	September 30, 2012			September 30, 2011
Property and equipment:
Furniture and fixtures	$	6.3		$	4.8
Software	3.9			2.4
Equipment	9.3			6.0
Leasehold improvements	9.0			7.1
Total property and equipment	28.5			20.3
Less accumulated depreciation	(9.6		)	(5.3		)
Property and equipment, net	$	18.9		$	15.0

- Definition

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

+ References + Details

Goodwill (Notes)

12 Months Ended

Sep. 30, 2012

Goodwill [Abstract]

Goodwill Disclosure [Text Block]

Goodwill

During the fiscal years ended September 30, 2012 and 2011, the Company recognized $1.1 million and $2.2 million, respectively, in additional goodwill related to acquisitions. See discussion in Note 18 related to the additional goodwill recorded for the Company's acquisitions.

Goodwill allocated to the Company’s operating segments as of September 30, 2012 and 2011 is as follows:



(in millions)	September 30, 2012		September 30, 2011
Commodity and Risk Management Services	$	32.0	$	30.9
Foreign Exchange	6.3		6.3
Securities	5.3		5.3
Goodwill	$	43.6	$	42.5

Intangible Assets (Notes)

12 Months Ended

Sep. 30, 2012

Intangible Assets [Abstract]

Intangible Assets Disclosure [Text Block]

Intangible Assets

Intangible assets acquired during the fiscal year ended September 30, 2012 relate to acquisitions, as discussed in Note 18. The gross and net carrying values of intangible assets as of the balance sheet dates, by major intangible asset class are as follows:



	September 30, 2012							September 30, 2011
(in millions)	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Intangible assets subject to amortization
Noncompete agreement	$	3.7	$	(3.0	)	$	0.7	$	3.7	$	(1.7	)	$	2.0
Trade name	0.7		(0.5		)	0.2		0.6		(0.5		)	0.1
Software programs/platforms	2.2		(1.0		)	1.2		2.1		(0.6		)	1.5
Customer base	9.6		(1.8		)	7.8		8.9		(1.0		)	7.9
	16.2		(6.3		)	9.9		15.3		(3.8		)	11.5
Intangible assets not subject to amortization
Trade name	1.2		—			1.2		2.1		—			2.1
Total intangible assets	$	17.4	$	(6.3	)	$	11.1	$	17.4	$	(3.8	)	$	13.6

Amortization expense related to intangible assets was $2.5 million, $2.3 million, and $0.7 million for the fiscal years ended 2012, 2011 and 2010, respectively. As of September 30, 2012, the estimated future amortization expense was as follows:



(in millions)
Fiscal 2013	$	2.0
Fiscal 2014	1.1
Fiscal 2015	0.8
Fiscal 2016	0.4
Fiscal 2017	0.4
Fiscal 2018 and thereafter	5.2
	$	9.9

During the fiscal year ended September 30, 2012, as part of the annual goodwill and intangible assets impairment analysis, the Company assessed the value of the indefinite-lived trade names related to previous acquisitions and determined that the value of the Hencorp Futures and Provident Group trade names had been impaired during the year. The Company is intending to discontinue the use of those trade names in the future, which impaired the value of the previously recorded intangible assets. The remaining value, if any, of the trade names was determined based on the income approach utilizing projected sales, an estimated royalty rate and discount rate.

The Company recorded impairment losses for the trade names of $0.8 million, within 'bad debts and impairments' on the consolidated income statement, during the fiscal year ended September 30, 2012. In addition, the Company determined that the remaining value of the Hencorp Futures trade name is no longer an indefinite-lived intangible asset. The remaining value of the Hencorp Futures trade name of $0.1 million is being amortized over a one year period. The Hencorp Futures and Provident Group trade names were recorded in the CR&M and Securities segments, respectively.

Credit Facilities (Notes)

12 Months Ended

Sep. 30, 2012

Credit Facilities [Abstract]

Debt Disclosure [Text Block]

Credit Facilities

As of September 30, 2012, the Company had four committed credit facilities under which the Company may borrow up to $385.0 million, subject to certain conditions. The amounts outstanding under these credit facilities are short term borrowings and carry variable rates of interest, thus approximating fair value.

The Company’s credit facilities as of September 30, 2012 consisted of the following:

A three-year syndicated committed loan facility established on October 29, 2010 and amended on May 22, 2012 to increase the amount under which the Company is entitled to borrow, up to $95 million, subject to certain conditions. The loan proceeds are used to finance working capital needs of the Company and certain subsidiaries. The line of credit is secured by a pledge of shares held in certain of the Company’s subsidiaries. Unused portions of the loan facility require a commitment fee of 0.625% on the unused commitment. Borrowings under the facility bear interest at the Eurodollar Rate, as defined, plus 3.00% or Base Rate, as defined, plus 2.00%, and averaged 3.22% as of September 30, 2012. The agreement contains financial covenants related to consolidated tangible net worth, consolidated domestic tangible net worth, consolidated interest coverage ratio and consolidated net unencumbered liquid assets, as defined. The Company was in compliance with these financial covenants as of September 30, 2012. The Company paid debt issuance costs of $1.2 million in connection with the issuance of this credit facility, which are being amortized over the thirty-six month term of the facility.

A revolving syndicated committed loan facility established on September 22, 2010 and amended on September 18, 2012, under which the Company’s subsidiary, INTL Commodities, Inc. ("INTL Commodities") is entitled to borrow up to $140 million, subject to certain conditions. The loan proceeds are used to finance the activities of INTL Commodities and are secured by its assets. Unused portions of the loan facility require a commitment fee of 0.75% on the unused commitment. The borrowings outstanding under the facility bear interest at the Eurodollar Rate, as defined and 0.21% as of September 30, 2012, plus 2.875% for the applicable term, at INTL Commodities’ election. The agreement contains financial covenants related to INTL Commodities’ working capital, equity and leverage ratio, as defined. The Company was in compliance with these covenants as of September 30, 2012. The Company paid debt issuance costs of $0.2 million in connection with the renewal of this credit facility, which are being amortized over the four month remaining term of the facility. The facility is guaranteed by the Company.

An unsecured syndicated committed line of credit, established on June 21, 2010 and renewed by amendment on April 12, 2012, under which the Company’s subsidiary, FCStone, LLC, may borrow up to $75 million. This line of credit is intended to provide short term funding of margin to commodity exchanges as necessary. This line of credit is subject to annual review, and the continued availability of this line of credit is subject to FCStone, LLC’s financial condition and operating results continuing to be satisfactory as set forth in the agreement. Unused portions of the margin line require a commitment fee of 0.50% on the unused commitment. Borrowings under the margin line are on a demand basis and bear interest at the Base Rate, as defined, plus 2.00%, which was 5.25% as of September 30, 2012. The agreement contains financial covenants related to FCStone, LLC’s tangible net worth, leverage ratio, and net capital, as defined. FCStone, LLC was in compliance with these covenants as of September 30, 2012. The facility is guaranteed by the Company.

A syndicated committed borrowing facility established on August 10, 2012, and amended on September 14, 2012, under which the Company’s subsidiary, FCStone Merchant Services, LLC ("FCStone Merchants") is entitled to borrow up to $75.0 million, subject to certain conditions. The loan proceeds are used to finance traditional commodity financing arrangements or the purchase of eligible commodities from sellers who have agreed to sell and later repurchase such commodities from FCStone Merchants, and are secured by its assets. Unused portions of the borrowing facility require a commitment fee of 0.50% on the unused commitment. The borrowings outstanding under the facility bear interest at a rate per annum equal to the Base Rate plus Applicable Margin, as defined, which averaged 2.39% as of September 30, 2012. The agreement contains financial covenants related to tangible net worth, as defined. FCStone Merchants was in compliance with this covenant as of September 30, 2012. FCStone Merchants paid minimal debt issuance costs in connection with this credit facility. The facility is guaranteed by the Company.

Credit facilities and outstanding borrowings as of September 30, 2012 and 2011 were as follows:



(in millions)					Amounts Outstanding
Borrower	Security	Renewal / Expiration Date	Total Commitment		September 30, 2012		September 30, 2011
INTL FCStone Inc.	Certain pledged shares	October 1, 2013	$	95.0	$	48.0	$	—
INTL Commodities	Certain commodities assets	January 31, 2013	140.0		107.0		60.0
FCStone, LLC	None	April 11, 2013	75.0		20.0		—
FCStone Merchants	Certain commodities assets	May 31, 2013	75.0		43.2		—
FCStone Merchants	Certain forward commodity contracts	Terminated June 2012	—		—		1.9
FCStone Financial, Inc.	Certain commodities assets	Terminated August 2012	—		—		15.5
			$	385.0	$	218.2	$	77.4

During fiscal 2013, or shortly thereafter, $385 million of the Company's committed credit facilities are scheduled to expire. The Company is currently in discussions with current and potential lenders to renew, extend or rearrange these facilities. While there is no guarantee that the Company will be successful in renewing, extending or rearranging these agreements as they expire, based on the Company's liquidity position and capital structure, the Company believes it will be able to do so. At this time, the Company is unable to determine the duration, applicable interest rates or other costs associated with the renewal or replacement of these facilities.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Commitments and Contingencies (Notes)

12 Months Ended

Sep. 30, 2012

Commitments and Contingencies [Abstract]

Commitments and Contingencies Disclosure [Text Block]

Commitments and Contingencies

Legal Proceedings

Certain conditions may exist as of the date the financial statements are issued, which may result in a loss to the Company but which will only be resolved when one or more future events occur or fail to occur. The Company assesses such contingent liabilities, and such assessment inherently involves an exercise of judgment. In assessing loss contingencies related to legal proceedings that are pending against the Company or unasserted claims that may result in such proceedings, the Company's legal counsel evaluates the perceived merits of any legal proceedings or unasserted claims as well as the perceived merits of the amount of relief sought or expected to be sought therein.

If the assessment of a contingency indicates that it is probable that a material loss had been incurred at the date of the financial statements and the amount of the liability can be estimated, then the estimated liability would be accrued in the Company's financial statements. If the assessment indicates that a potentially material loss contingency is not probable, but is reasonably possible, or is probable but cannot be estimated, then the nature of the contingent liability, together with an estimate of the range of possible loss if determinable and material, would be disclosed. Neither accrual nor disclosure is required for loss contingencies that are deemed remote. The Company accrues legal fees related to contingent liabilities as they are incurred.

In addition to the matters discussed below, from time to time and in the ordinary course of business, the Company is involved in various legal actions and proceedings, including tort claims, contractual disputes, employment matters, workers' compensation claims and collections. The Company carries insurance that provides protection against certain types of claims, up to the policy limits of the insurance. During the years ended September 30, 2012 and 2011, loss contingency accruals, not having a material impact on the consolidated financial statements, have been recorded. In the opinion of management, possible exposure in these matters in excess of the amounts accrued, is not material to the Company's earnings, financial position, or liquidity.

The following is a summary of significant legal matters involving the Company.

Securities Litigation

FCStone and certain officers of FCStone were named as defendants in an action filed in the United States District Court for the Western District of Missouri on July 15, 2008. A consolidated amended complaint ("CAC") was subsequently filed on September 25, 2009. As alleged in the CAC, the action purports to be brought as a class action on behalf of purchasers of FCStone common stock between November 15, 2007 and February 24, 2009. The CAC seeks to hold defendants liable under Section 10(b) and Section 20(a) of the Securities Exchange Act of 1934 and concerns disclosures included in FCStone's fiscal year 2008 public filings. Specifically, the CAC relates to FCStone's public disclosures regarding an interest rate hedge, a bad debt expense arising from unprecedented events in the cotton trading market, and certain disclosures beginning on November 3, 2008 related to losses it expected to incur arising primarily from a customer energy trading account. FCStone and the named officers moved to dismiss the action. The parties to the litigation reached an agreement in principle to settle this matter during May 2012. The proposed settlement would be at no cost to the Company after consideration of insurance, and is subject to approval by the court.

In August 2008, a shareholder derivative action was filed against FCStone and certain directors of FCStone in the Circuit Court of Platte County, Missouri, alleging breaches of fiduciary duties, waste of corporate assets and unjust enrichment. An amended complaint was subsequently filed in May 2009 to add claims based upon the losses sustained by FCStone arising out of a customer's energy trading account. On July 7, 2009, the same plaintiff filed a motion for leave to amend the existing case to add a purported class action claim on behalf of the holders of FCStone common stock.

On July 8, 2009, a purported shareholder class action complaint was filed against FCStone and its directors, as well as the Company in the Circuit Court of Clay County, Missouri. The complaint alleged that FCStone and its directors breached their fiduciary duties by failing to maximize stockholder value in connection with the contemplated acquisition of FCStone by the Company. This complaint was subsequently consolidated with the complaint filed in the Circuit Court of Platte County, Missouri. The plaintiffs subsequently filed an amended consolidated complaint which does not assert any claims against the Company. This complaint purports to be filed derivatively on FCStone and the Company's behalf and against certain of FCStone current and former directors and officers and directly against the same individuals. The Company, FCStone, and the defendants filed motions to dismiss on multiple grounds. The parties to the litigation reached an agreement in principle to settle this matter during October 2012. The proposed settlement will result in the Company incurring a legal cost of $250,000 after consideration of insurance, and is subject to approval by the court.

As previously disclosed, the Staff of the Fort Worth Regional Office of the Securities and Exchange Commission (the "SEC") had conducted a formal investigation of FCStone's disclosures and accounting for losses associated with the energy trading account, which occurred prior to the Company's acquisition of FCStone on September 30, 2009. The Company cooperated fully with the SEC Staff in its investigation. During the quarter ended March 31, 2012, the Company was informed that the Staff of the SEC had closed its investigation of FCStone, and was not taking enforcement action against FCStone or any of its current or former officers.

In February 2011, the Company's Board of Directors formed a special committee to conduct an independent investigation of FCStone's disclosures and accounting for losses associated with the energy trading account. The Company's Board of Directors determined that it would be appropriate and consistent with its governance and oversight responsibilities to form the special committee to investigate these matters as they pertain to the private litigation and the SEC investigation described above. The special committee, which was comprised solely of independent directors of the Company who were not formerly directors of FCStone, retained an independent law firm to represent and assist it in its investigation. The special committee was disbanded at the Company's November 2012 meeting of the Board of Directors, having completed its task.

In November 2011, the CFTC Division of Enforcement Staff ("Staff") requested the Company to voluntarily produce specified documents to the Staff in connection with its then informal investigation of the losses that occurred in the energy trading account. On September 20, 2012, the Staff provided the Company with a Wells Notice, indicating the Staff's intention to recommend that the CFTC bring certain charges against FCStone LLC. The Company believes that the recommended charges are not warranted, and in response to the Staff's Wells Notice, the Company filed its Wells Submission with the Staff in October 2012. At this time, the Company cannot predict whether the CFTC will accept the Staff's recommendations with respect to the proposed charges. The Company likewise cannot predict the continued scope, duration or outcome of this matter, including the amount of monetary penalty or fine, if any, that would be assessed if the CFTC elected to pursue enforcement action and prevailed against the Company in a contested proceeding.

Convertible Note Holder Litigation

In November 2009, an investor holding $3.7 million of the Company's senior subordinated convertible notes due 2011 (the “Notes”) filed a notice of motion for summary judgment on the Company, claiming that the FCStone transaction resulted in a change of control as defined in the Notes; and that, as a result, the Company should have afforded the investor the opportunity to have the Notes redeemed at a 15% premium. The investor also claimed default interest at the rate of 15% per annum established in the Notes. The investor's motion was denied in March 2010, and the investor filed an amended complaint in April 2010. The remaining three holders of the Notes, holding Notes in an aggregate amount of $13.0 million, filed a similar lawsuit on the Company in October 2010.

During the year ended September 30, 2011, all of the remaining holders of the Notes converted the principal amount and accrued interest into shares of common stock of the Company. Subsequent to conversion, two holders of the Notes, each a holder of $4.0 million in principal amount of the convertible notes as of September 30, 2009, persisted in their claims against the Company. During March 2012, the Company entered into a settlement agreement with the two holders of the Notes, pursuant to which the Company paid the plaintiffs the amount of $200,000 in settlement of all claims.

Sentinel Litigation

The Company's subsidiary, FCStone, LLC, had a portion of its excess segregated funds invested with Sentinel Management Group Inc. ("Sentinel"), a registered FCM and an Illinois-based money manager that provided cash management services to other FCMs. In August 2007, Sentinel halted redemptions to customers and sold certain of the assets it managed to an unaffiliated third party at a significant discount. On August 17, 2007, subsequent to Sentinel's sale of certain assets, Sentinel filed for bankruptcy protection and $15.5 million of FCStone, LLC's $21.9 million in invested funds were returned to it.

In August 2008, the bankruptcy trustee of Sentinel filed adversary proceedings against FCStone, LLC and a number of other FCMs in the Bankruptcy Court for the Northern District of Illinois. The case was subsequently reassigned to the United States District Court, for the Northern District of Illinois. In the complaint, the trustee is seeking avoidance of alleged transfers or withdrawals of funds received by FCStone, LLC and other FCMs within 90 days prior to the filing of the Sentinel bankruptcy petition, as well as avoidance of post-petition distributions and disallowance of the proof of claim filed by FCStone, LLC. The trustee seeks recovery of pre- and post-petition transfers totaling approximately $15.5 million. In April 2009, the trustee filed an amended complaint adding a claim for unjust enrichment. FCStone, LLC answered the complaints and all parties entered into the discovery phase of the litigation. On January 21, 2011 the trustee filed a motion for summary judgment against FCStone, LLC on various counts in the adversary proceedings filed in August 2008 against FCStone, LLC and a number of other FCMs. On January 13, 2012, FCStone, LLC filed a motion for summary judgment in its favor with respect to the transfer of approximately $1.1 million to its customer segregated account on August 17, 2007, pursuant to the "safe harbor" provisions of Section 546(e) of the U.S. Bankruptcy Code. On April 17, 2012, FCStone, LLC and all other FCM Defendants filed a motion to dismiss a portion of the Trustee's claims set forth in its amended complaint. The trial of this matter took place during October 2012. Judgment is expected during the first calendar quarter of 2013.

Contractual Commitments

Contingent Liabilities - Acquisitions

Under the terms of the purchase agreements, related to the acquisitions listed below, the Company has obligations to pay additional consideration if specific conditions and earnings targets are met. In accordance with the Business Combinations Topic of the ASC, the fair value of the additional consideration is recognized as a contingent liability as of the acquisition date. The contingent liability for these estimated additional purchase price considerations are included within ‘accounts payable and other accrued liabilities’ in the consolidated balance sheets as of September 30, 2012 and 2011. The acquisition date fair value of additional consideration is remeasured to its fair value each reporting period, with changes in fair value recorded in current earnings.

The Company has a contingent liability relating to the November 2011 acquisition of Coffee Network, LLC, subsequently reorganized as a division of FCStone, LLC, which may result in the payment of additional purchase price consideration, see Note 18 for discussion of the acquisition. The acquisition date fair value of additional consideration was estimated to be less than $0.1 million. The contingent liability recorded represents the fair value of the expected consideration to be paid, based on the forecasted adjusted pre-tax net earnings during the three annual periods following the closing of the acquisition plus a final contingent payment, and a discount rate being applied to those future payments.

The Company has a contingent liability relating to the October 2010 acquisition of Hencorp Becstone Futures, L.C., subsequently reorganized as a division of FCStone, LLC, ("Hencorp Futures"), which may result in the payment of additional purchase price consideration, see Note 18 for discussion of the acquisition. The acquisition date fair value of additional consideration was estimated to be $2.3 million. The contingent liability recorded represents a contingent payment of $0.3 million based on adjusted pre-tax net earnings of Hencorp Futures for fiscal 2012 and the fair value of the expected consideration to be paid, based on the forecasted adjusted pre-tax net earnings during the third and fourth fiscal years following the closing of the acquisition and a discount rate being applied to those future payments. The Company expects to make cash payments of $0.3 million, $0.4 million and $2.3 million in fiscal 2013, 2014 and 2015, respectively, related to this contingent liability. The change in fair value during the years ended September 30, 2012 and 2011 were increases of $0.1 million and $0.5 million, respectively, included within ‘other’ in the consolidated income statements. The present value of the estimated total purchase price, including contingent consideration, is $6.5 million as of September 30, 2012, of which $2.5 million has not been paid and is included within ‘accounts payable and other accrued liabilities’ in the consolidated balance sheets. The present value of the estimated total purchase price, including contingent consideration, was $6.4 million as of September 30, 2011.

The Company has a contingent liability relating to the July 2010 acquisition of the Hanley Companies, which may result in the payment of additional purchase price consideration, see Note 18 for discussion of the acquisition. The acquisition date fair value of additional consideration was estimated to be $15.6 million. The contingent liability recorded represents contingent payments equal to 15% of the adjusted earnings before interest and taxes of the soft commodities derivatives business of the acquired Hanley Companies and INTL Hanley, LLC (the “Derivatives Division”) for the twelve-month period ending June 30, 2013 and a final contingent payment based on the cumulative adjusted earnings before interest and taxes of the Derivatives Division for the three year period commencing on July 1, 2010, with a discount rate being applied to those future payments. The Company expects to make a cash payment of $10.0 million in fiscal 2013 related to this contingent liability. The change in fair value for the years ended September 30, 2012 and 2011 were increases of $2.0 million and $4.2 million, respectively, included within ‘other’ in the consolidated income statements. The present value of the estimated total purchase price, including contingent consideration, is $53.5 million as of September 30, 2012, of which $9.3 million has not been paid and is included within ‘accounts payable and other accrued liabilities’ in the consolidated balance sheets. The present value of the estimated total purchase price, including contingent consideration, was $51.6 million as of September 30, 2011.

The Company has a contingent liability relating to the April 2010 acquisition of the RMI Companies, subsequently reorganized as divisions of FCStone, LLC, which may result in the payment of additional consideration, see Note 18 for discussion of the acquisition. The acquisition date fair value of additional consideration was estimated to be $10.7 million. The contingent liability recorded represents the fair value of expected consideration to be paid based on the forecasted sales during the twelve month period ending March 31, 2013, and a discount rate being applied to this future payment. The Company expects to make a cash payment of $3.1 million in fiscal 2013 related to this contingent liability. The change in fair value for the years ended September 30, 2012 and 2011 were decreases of $28 thousand and $1.5 million, respectively, included within ‘other’ in the consolidated income statements. The present value of the estimated total purchase price, including contingent consideration, is $15.1 million as of September 30, 2012, of which $2.9 million has not been paid and is included within ‘accounts payable and other accrued liabilities’ in the consolidated balance sheets. The present value of the estimated total purchase price, including contingent consideration, was $15.2 million as of September 30, 2011.

The Company has a contingent liability relating to the February 2008 acquisition of Globecot, Inc. Under the terms of the purchase agreement, the Company has an obligation to pay additional consideration if specific conditions and earnings targets are met in the twelve-month period ending January 31, 2013. As a result of the Company's acquisition of FCStone Group, Inc. and subsidiaries (the "FCStone transaction"), effective September 30, 2009, any additional consideration would be considered an adjustment to a pre-acquisition contingency, made after the end of the allocation period, and included in earnings in the current period. As of September 30, 2012, no accrual has been recorded related to this contingent liability, and the additional consideration is limited to $0.4 million for the twelve-month period.

Operating Leases

The Company is obligated under various noncancelable operating leases for the rental of office facilities, aircraft, automobiles, service obligations and certain office equipment, and accounts for these lease obligations on a straight line basis. The expense associated with operating leases amounted to $8.9 million, $7.2 million and $5.5 million, for fiscal years ended 2012, 2011 and 2010, respectively. The expenses associated with the operating leases and service obligations are reported in the consolidated income statements within occupancy and equipment rental, clearing and related and other expenses.

Future aggregate minimum lease payments under noncancelable operating leases as of September 30, 2012 are as follows:



(in millions)
Year ending September 30,
	2013	$	7.1
	2014	6.1
	2015	4.9
	2016	5.7
	2017	6.3
	Thereafter	9.3
		$	39.4

Purchase Commitments

The Company determines an estimate of contractual purchase commitments in the ordinary course of business primarily for the purchase of precious and base metals. Unpriced contract commitments have been estimated using September 30, 2012 fair values. The purchase commitments and other obligations as of September 30, 2012 for less than one year, one to three years, three to five years and after five years were $635.5 million, $6.1 million, $3.3 million and $2.4 million, respectively.

Exchange Member Guarantees

The Company is a member of various exchanges that trade and clear futures and option contracts. Associated with its memberships, the Company may be required to pay a proportionate share of the financial obligations of another member who may default on its obligations to the exchanges. While the rules governing different exchange memberships vary, in general the Company’s guarantee obligations would arise only if the exchange had previously exhausted its resources. In addition, any such guarantee obligation would be apportioned among the other non-defaulting members of the exchange. Any potential contingent liability under these membership agreements cannot be estimated. The Company has not recorded any contingent liability in the consolidated financial statements for these agreements and believes that any potential requirement to make payments under these agreements is remote.

Impairment

The Company recorded an impairment charge of $1.1 million for the year ended September 30, 2010 in connection with INTL Sieramet LLC, a corporation in which it held a 55% equity interest. This amount is recorded within ‘bad debts and impairments’ in the consolidated income statement for the year ended September 30, 2010. The assets of INTL Sieramet LLC were liquidated and the company was dissolved during fiscal 2012, resulting in a reversal of $0.1 million in previously recorded impairment charges.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Regulatory Requirements and Subsidiary Dividend Restrictions (Notes)

12 Months Ended

Sep. 30, 2012

Capital and Other Regulatory Requirements [Abstract]

Regulatory Capital Requirements under Banking Regulations [Text Block]

Regulatory Requirements and Subsidiary Dividend Restrictions

The Company's subsidiary FCStone, LLC is a commodity futures commission merchant registered with the CFTC servicing customers primarily in grain, energy and food service-related businesses. Pursuant to the rules, regulations, and requirements of the CFTC and other regulatory agencies, FCStone, LLC is required to maintain certain minimum net capital as defined in such rules, regulations, and requirements. Net capital and the related net capital requirement may fluctuate on a daily basis. FCStone, LLC also has restriction on dividends, which restricts the withdrawal of equity capital if the planned withdrawal would reduce net capital, subsequent to haircuts and charges, to an amount less than 120% of the greatest minimum requirement.

Pursuant to the requirements of the Commodity Exchange Act, funds deposited by customers of FCStone, LLC relating to their trading of futures and options-on-futures on a U.S. commodities exchange must be carried in separate accounts which are designated as segregated customers’ accounts. Pursuant to the requirements of the CFTC, funds deposited by customers of FCStone, LLC relating to their trading of futures and options-on-futures traded on, or subject to the rules of, a foreign board of trade must be carried in separate accounts in an amount sufficient to satisfy all of FCStone LLC's current obligations to customers trading foreign futures and foreign options on foreign commodity exchanges or boards of trade, which are designated as secured customers’ accounts. See Additional Information of FCStone, LLC Related to Customer Segregated and Secured Funds further below for additional information regarding FCStone, LLC's calculation of segregated and secured customer funds.

The Company's subsidiary INTL FCStone (Europe) is regulated by the Financial Services Authority ("FSA"), the regulator of the financial services industry in the United Kingdom, as a Financial Services Firm under part IV of the Financial Services and Markets Act 2000. The regulations impose daily regulatory capital, as well as conduct of business, governance, and other requirements. The conduct of business rules include those that govern the treatment of client money and other assets which under certain circumstances for certain classes of client must be segregated from the firm's own assets.

The Company's subsidiary INTL Global Currencies Limited is regulated by the FSA as a Payment Institution under the Payment Services Regulations 2009. The regulations impose regulatory capital (reported annually), and conduct of business requirements.

The Company's subsidiary TRX Futures Limited is regulated by the FSA as a Financial Services Firm under part IV of the Financial Services and Markets Act 2000, and was subject to a capital adequacy requirement at September 30, 2012. Subsequent to September 30, 2012, the activities of TRX Futures Limited have been reorganized within INTL FCStone (Europe), and TRX Futures Limited is in the process of dissolution.

The Company’s subsidiary INTL FCStone Securities Inc. ("INTL FCStone Securities") is a registered broker dealer and member of the Financial Industry Regulatory Authority ("FINRA") and is subject to the SEC Uniform Net Capital Rule 15c3-1. This rule requires the maintenance of minimum net capital, and requires that the ratio of aggregate indebtedness to net capital not exceed 15 to 1. A further requirement is that equity capital may not be withdrawn if this ratio would exceed 10 to 1 after such withdrawal.

The Company’s subsidiary FCC Investments, Inc. is a registered broker-dealer and a member of FINRA, and is subject to the SEC Uniform Net Capital Rule 15c3-1.

The Company’s subsidiary FCStone Australia Pty Ltd ("FCStone Australia") is regulated by the Australian Securities and Investment Commission and is subject to a net tangible asset capital requirement. FCStone Australia is also regulated by the New Zealand Clearing Limited, and is subject to a capital adequacy requirement.

FCStone Commodity Services (Europe), Ltd. is domiciled in Ireland and subject to regulation by the Financial Regulator of Ireland, and is subject to a net capital requirement.

INTL FCStone DTVM Ltda. ("INTL FCStone DTVM") is a registered broker-dealer and regulated by the Brazilian Central Bank and Securities and Exchange Commission of Brazil, and is subject to a capital adequacy requirement of $0.7 million. The recently acquired INTL FCStone DTVM, a shell company with no significant operations, had net capital lower than the minimum required amount by less than $0.1 million as of September 30, 2012. The Company expects to remediate this shortfall in net capital of INTL FCStone DTVM for the semi-annual regulatory filing prepared as of December 31, 2012.

Excluding INTL FCStone DTVM, all other subsidiaries of the Company are in compliance with all of their regulatory requirements as of September 30, 2012, as follows:



(in millions)			As of September 30, 2012
Subsidiary	Regulatory Authority	Requirement Type	Actual		Minimum Requirement
FCStone, LLC	CFTC	Net capital	$	124.3	$	86.3
FCStone, LLC	CFTC	Segregated funds	$	1,665.5	$	1,620.5
FCStone, LLC	CFTC	Secured funds	$	89.3	$	77.6
INTL FCStone (Europe)	FSA	Net capital	$	35.0	$	18.8
INTL FCStone (Europe)	FSA	Segregated funds	$	26.4	$	26.4
INTL Global Currencies Limited	FSA	Net capital	$	7.6	$	1.2
TRX Futures Limited	FSA	Capital adequacy	$	8.5	$	4.3
INTL FCStone Securities Inc.	SEC	Net capital	$	2.0	$	1.0
FCC Investments, Inc.	SEC	Net capital	$	0.4	$	0.3
FCStone Australia	Australian Securities and Investment Commission	Net capital	$	1.9	$	1.0
FCStone Australia	New Zealand Clearing Ltd	Capital adequacy	$	11.5	$	1.3
FCStone Europe	Central Bank of Ireland	Net capital	$	1.8	$	0.4

Certain other non-U.S. subsidiaries of the Company are also subject to capital adequacy requirements promulgated by authorities of the countries in which they operate. As of September 30, 2012, these subsidiaries were in compliance with their local capital adequacy requirements.

Additional Information of FCStone, LLC Related to Customer Segregated and Secured Funds

Pursuant to the requirements of the Commodity Exchange Act, funds deposited by customers of FCStone, LLC relating to futures and options-on-futures positions in regulated commodities must be carried in separate accounts which are designated as segregated customers’ accounts. Certain amounts in the accompanying table reflect reclassifications and eliminations required for regulatory filing. Funds deposited by customers and other assets, which have been segregated as belonging to the commodity customers as of September 30, 2012 and 2011, are as follows:



(in millions)	September 30, 2012		September 30, 2011
Cash, at banks - segregated	$	225.6	$	71.3
Securities - customer segregated	—		5.5
Securities held for customers in lieu of cash, at banks	47.2		3.7
Deposits with and receivables from:
Exchange-clearing organizations, including securities, net of omnibus eliminations	1,370.4		1,358.0
Securities held for customers in lieu of cash	22.3		19.0
Total customer-segregated funds	1,665.5		1,457.5
Amount required to be segregated	1,620.5		1,406.6
Excess funds in segregation	$	45.0	$	50.9

Funds deposited by customers and other assets, which are held in separate accounts for customers trading foreign futures and foreign options customers, as of September 30, 2012 and 2011 are as follows:



(in millions)	September 30, 2012		September 30, 2011
Cash - secured	$	25.2	$	6.4
Securities	3.3		—
Equities with futures commission merchants	9.9		30.3
Amounts held by clearing organizations of foreign boards of trade	20.8		—
Amounts held by members of foreign boards of trade	30.1		2.1
Total customer-secured funds	89.3		38.8
Amount required to be secured	77.6		27.2
Excess secured funds	$	11.7	$	11.6

- Definition

The entire disclosure for banks, savings institutions, and credit unions, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of Thrift Supervision (OTS) or for any state imposed capital requirements, as applicable. The disclosure may include (1) a description of regulatory capital requirements (a) for capital adequacy purposes and (b) established by the prompt corrective action provisions of Section 38 of the Federal Depository Insurance Act; (2) the actual or possible material effects of noncompliance with such requirements; (3) whether the entity is in compliance with the regulatory capital requirements including (a) required and actual ratios and amounts of Tier 1 leverage, Tier 1 risk-based, and total risk-based capital, tangible capital (for savings institutions), and Tier 3 capital for market risk (for certain banks and bank holding companies), (b) factors that may significantly affect capital adequacy; (4) the prompt corrective action category in which the entity was classified as of its most recent notification; (5) whether management believes any conditions or events since notification have changed the entity's category. Also may include additional information that might be disclosed in situations where substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1G
-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958577-112826

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1C
-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958572-112826

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 505
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-Paragraph 1H
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 942
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958570-112826

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1D
-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958573-112826

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
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-Paragraph 1F
-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958575-112826

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-DEP
-Paragraph 15, 16, 17
-IssueDate 2006-05-01
-Chapter 17
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commodity and Other Repurchase Agreements	12 Months Ended
Commodity and Other Repurchase Agreements	Sep. 30, 2012
Commodity and Other Repurchase Agreements [Abstract]
Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block]	Commodity and Other Repurchase Agreements The Company's outstanding notes receivable in connection with the sale/repurchase agreements, whereby the customers sell certain commodity inventory and agree to repurchase the commodity inventory at a future date at either a fixed or floating rate, as of September 30, 2012 and 2011 was $92.5 million and $24.3 million, respectively. The obligations outstanding related to commodities sold under repurchase agreements that are recorded within 'broker-dealers, clearing organizations and counterparties' as of September 30, 2012 and 2011 were $37.0 million and $0, respectively. The obligations outstanding related to commodities sold under repurchase agreements that are recorded within 'lenders under loans' as of September 30, 2012 and 2011 were $43.2 million and $17.4 million, respectively.

Stock-Based Compensation (Notes)

12 Months Ended

Sep. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

Stock-Based Compensation

Stock-based compensation expense is included within Compensation and benefits in the consolidated income statements and totaled $5.9 million, $2.3 million and $1.9 million for the fiscal years ended 2012, 2011 and 2010, respectively.

Stock Option Plans

The Company sponsors a stock option plan for its directors, officers, employees and consultants. On February 23, 2012, the Company's shareholders approved an amendment to the stock option plan that increased the maximum number of shares that may be issued under the stock option plan from 2,250,000 to 3,250,000 shares. As of September 30, 2012, 921,412 shares were authorized for future grant under this plan. Awards that expire or are canceled generally become available for issuance again under the plan. The Company settles stock option exercises with newly issued shares of common stock.

Fair value is estimated at the grant date based on a Black-Scholes-Merton option-pricing model using the following weighted-average assumptions:



	Year Ended September 30,
	2012		2011		2010
Expected stock price volatility	57	%	77	%	85	%
Expected dividend yield	—	%	—	%	—	%
Risk free interest rate	1.53	%	0.72	%	1.45	%
Average expected life (in years)	7.86		2.94		2.80

Expected stock price volatility rates are primarily based on the historical volatility. The Company has not paid dividends in the past and does not currently expect to do so in the future. Risk free interest rates are based on the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option or award. The average expected life represents the estimated period of time that options or awards granted are expected to be outstanding, based on the Company’s historical share option exercise experience for similar option grants. The weighted average fair value of options issued during fiscal years ended 2012, 2011 and 2010 was $13.57, $11.66 and $8.12, respectively.

The following is a summary of stock option activity for the year ended September 30, 2012:



	Shares Available for Grant		Number of Options Outstanding		Weighted Average Exercise Price		Weighted Average Grant Date Fair Value		Weighted Average Remaining Term (in years)	Aggregate Intrinsic Value ($ millions)
Balances at September 30, 2011	750,481		1,344,646		$	21.05	$	8.93	3.06	$	9.8
Additional shares authorized by shareholders	1,000,000
Granted	(925,000	)	925,000		$	25.71	$	13.57
Exercised			(212,160	)	$	8.68	$	6.11
Forfeited	46,500		(46,500	)	$	25.74	$	13.53
Expired	49,431		(120,352	)	$	40.56	$	13.54
Balances at September 30, 2012	921,412		1,890,634		$	23.36	$	11.11	5.45	$	6.0
Exercisable at September 30, 2012			695,702		$	26.84	$	11.13	2.63	$	2.7

The total compensation cost not yet recognized for non-vested awards of $11.6 million as of September 30, 2012 has a weighted-average period of 6.09 years over which the compensation expense is expected to be recognized. The total intrinsic value of options exercised during fiscal years 2012, 2011 and 2010 was $3.0 million, $1.6 million and $1.4 million, respectively.

The options outstanding as of September 30, 2012 broken down by exercise price are as follows:



Exercise Price					Number of Options Outstanding	Weighted Average Exercise Price		Weighted Average Remaining Term (in Years)
$	—	-	$	5.00	68,374	$	2.50	0.43
$	5.00	-	$	10.00	379,830	$	7.03	2.13
$	10.00	-	$	15.00	8,560	$	14.60	0.63
$	15.00	-	$	20.00	276,269	$	18.12	2.75
$	20.00	-	$	25.00	127,876	$	23.51	4.07
$	25.00	-	$	30.00	800,000	$	25.91	9.22
$	30.00	-	$	35.00	—	n/a		n/a
$	35.00	-	$	40.00	—	n/a		n/a
$	40.00	-	$	45.00	—	n/a		n/a
$	45.00	-	$	50.00	—	n/a		n/a
$	50.00	-	$	55.00	229,725	$	54.23	3.49
					1,890,634	$	23.36	5.45

Restricted Stock Plan

The Company sponsors a restricted stock plan for its directors, officers and employees. On January 31, 2012, the Company's 2007 restricted stock plan expired. On February 23, 2012, shareholders approved the Company's 2012 restricted stock plan authorizing up to 1.5 million shares to be issued. As of September 30, 2012, 1,420,114 shares were authorized for future grant under the restricted stock plan. Awards that expire or are canceled generally become available for issuance again under the plan. The Company utilizes newly issued shares of common stock to make restricted stock grants.

The following is a summary of restricted stock activity through September 30, 2012:



	Shares Available for Grant		Number of Shares Outstanding		Weighted Average Grant Date Fair Value		Weighted Average Remaining Term (in years)	Aggregate Intrinsic Value ($ millions)
Balances at September 30, 2011	290,963		299,118		$	17.71	1.92	$	6.2
Termination of 2007 Plan	(22,075	)
Additional shares authorized by shareholders	1,500,000
Granted	(348,961	)	348,961		$	23.82
Vested			(135,627	)	$	16.89
Forfeited	187		(328	)	$	23.02
Balances at September 30, 2012	1,420,114		512,124		$	22.09	1.81	$	9.8

The total compensation cost not yet recognized of $7.7 million as of September 30, 2012 has a weighted-average period of 1.81 years over which the compensation expense is expected to be recognized. Compensation expense is amortized on a straight-line basis over the vesting period. Restricted stock grants are included in the Company’s total issued and outstanding common shares.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 718
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Retirement Plans

12 Months Ended

Sep. 30, 2012

Compensation and Retirement Disclosure [Abstract]

Pension and Other Postretirement Benefits Disclosure [Text Block]

Retirement Plans

Defined Benefit Retirement Plans

As a result of its acquisition of FCStone on September 30, 2009, the Company has a qualified and a nonqualified noncontributory retirement plan, which are defined benefit plans that cover certain employees. Prior to acquisition, the plans were closed to new employees, and amended to freeze all future benefit accruals, therefore no additional benefits accrue for active participants under the plans.

The following table presents changes in, and components of, the Company’s net liability for retirement costs as of and for the years ended September 30, 2012, 2011 and 2010, based on measurement dates of September 30, 2012, 2011 and 2010, respectively:



(in millions)	September 30, 2012			September 30, 2011			September 30, 2010
Changes in benefit obligation:
Benefit obligation, beginning of year	$	39.0		$	37.6		$	35.6
Service cost	—			—			—
Interest cost	1.8			1.9			2.0
Actuarial loss	5.8			2.6			2.8
Benefits paid	(3.8		)	(3.1		)	(2.8		)
Benefit obligation, end of year	42.8			39.0			37.6
Changes in plan assets:
Fair value, beginning of year	24.2			24.2			18.9
Actual return	4.6			(0.4		)	1.7
Employer contribution	1.5			3.5			6.4
Benefits paid	(3.8		)	(3.1		)	(2.8		)
Fair value, end of year	26.5			24.2			24.2
Funded status	$	(16.3	)	$	(14.8	)	$	(13.4	)

The Company is required to recognize the funded status of its defined benefit pension plans measured as the difference between plan assets at fair value and the projected benefit obligation on the consolidated balance sheets as of September 30, 2012 and 2011, and to recognize changes in the funded status, that arise during the periods but are not recognized as components of net periodic pension cost, within accumulated other comprehensive loss, net of tax. Amounts recognized in the consolidated balance sheets consist of $0.1 million and $0.2 million included within ‘other assets’ as of September 30, 2012 and 2011, respectively, and $16.4 million and $15.0 million included within ‘accounts payable and other accrued liabilities’ as of September 30, 2012 and 2011, respectively.

Accumulated other comprehensive loss, net of tax, includes amounts for actuarial losses in the amount of $6.2 million and $4.6 million as of September 30, 2012 and 2011, respectively. The estimated net loss for the defined benefit pension plans that will be amortized from accumulated other comprehensive loss into net periodic pension cost during fiscal 2013 is $0.8 million.

The following table displays the Company’s defined benefit plans that have accumulated benefit obligations and projected benefit obligations in excess of the fair value of plans assets (underfunded ABO) as of September 30, 2012 and 2011:



(in millions)	September 30, 2012		September 30, 2011
Accumulated benefit obligations	$	42.8	$	39.0
Projected benefit obligations	$	42.8	$	39.0
Plan assets	$	26.5	$	24.2

The defined benefit obligations were based upon annual measurement dates of September 30, 2012 and 2011. The following weighted-average assumptions were used to determine benefit obligations in the accompanying consolidated balance sheets as of September 30, 2012 and 2011:



	September 30, 2012	September 30, 2011
Weighted average assumptions:
Discount rate	3.80%	4.80%
Expected return on assets	7.00%	7.30%

The following weighted-average assumptions were used to determine net periodic pension cost for the years ended September 30, 2012 and 2011:



	Year Ended September 30,
	2012	2011	2010
Weighted average assumptions:
Discount rate	4.80%	5.30%	5.90%
Expected return on assets	7.30%	7.30%	8.25%

To account for the defined benefit pension plans in accordance with the guidance in the Compensation – Retirement Benefits Topic of the ASC the Company makes two main determinations at the end of each fiscal year. These determinations are reviewed annually and updated as necessary, but nevertheless, are subjective and may vary from actual results.

First, the Company must determine the actuarial assumption for the discount rate used to reflect the time value of money in the calculation of the projected benefit obligations for the end of the current fiscal year and to determine the net periodic pension cost for the subsequent fiscal year. The objective of the discount rate assumption is to reflect the interest rate at which pension benefits could be effectively settled. In making this determination, the Company considers the timing and amount of benefits that would be available under the plans. The discount rates as of September 30, 2012, 2011 and 2010 were based on a model portfolio of high-quality fixed-income debt instruments with durations that are consistent with the expected cash flows of the benefit obligations.

Second, the Company must determine the expected long-term rate of return on assets assumption that is used to determine the expected return on plan assets component of the net periodic pension cost for the subsequent period. The expected long-term rate of return on asset assumption was determined, with the assistance of the Company’s investment consultants, based on a variety of factors. These factors include, but are not limited to, the plan’s asset allocations, a review of historical capital market performance, historical plan performance, current market factors such as inflation and interest rates, and a forecast of expected future asset returns. The Company reviews this long-term assumption on an annual basis.

As a result of the defined benefit plans having a frozen status, no additional benefits will be accrued for active participants under the plan, and accordingly no assumption will be made for the rate of increase in compensation levels in the future.

The components of net periodic pension cost recognized in the consolidated income statements for the years ended September 30, 2012, 2011 and 2010 were as follows:



	Year Ended September 30,
(in millions)	2012			2011			2010
Interest cost	$	1.8		$	1.9		$	2.0
Less expected return on assets	(1.7		)	(1.7		)	(1.7		)
Net amortization and deferral	0.4			—			—
Net periodic pension cost	$	0.5		$	0.2		$	0.3

Other changes in plan assets and benefit obligations recognized in other comprehensive income for the years ended September 30, 2012 and 2011 were as follows:



	Year Ended September 30,
(in millions)	2012			2011
Net loss	$	2.9		$	4.6
Amortization of loss	(0.4		)	—
Total recognized in other comprehensive income	2.5			4.6
Total recognized in net periodic benefit cost and other comprehensive income	$	3.0		$	4.8

Plan Assets

The following table sets forth the actual asset allocation as of September 30, 2012 and 2011, and the target asset allocation for the Company’s plan assets:



	September 30, 2012	September 30, 2011	Target Asset Allocation
Equity securities	66%	70%	70%
Debt securities	34%	30%	30%
Total	100%	100%

The long-term goal for equity exposure and for fixed income exposure is presented above. The exact allocation at any point in time is at the discretion of the investment manager, but should recognize the need to satisfy both the volatility and the rate of return objectives for equity exposure and satisfy the objective of preserving capital for the fixed income exposure.

The investment philosophy of the Company’s pension plans reflect that over the long-term, the risk of owning equities has been and should continue to be rewarded with a greater return than that available from fixed income investments. The primary objective is for the plan to achieve a rate of return sufficient to fully fund the pension obligation without assuming undue risk.

Investments in the Company’s pension plans include debt and equity securities. The fair value of plan assets is based upon the fair value of the underlying investments, which include cash equivalents, common stock, U.S. government securities and federal agency obligations, municipal and corporate bonds, and equity funds. Cash equivalents consist of short-term money market funds that are stated at cost, which approximates fair value. The shares of common stock, U.S. government securities and federal agency obligations, municipal and corporate bonds are stated at estimated fair value based upon quoted market prices, if available, or dealer quotes. The equity funds are investment vehicles valued using the net asset value (“NAV”) provided by the administrator of the fund. The NAV is based on the underlying assets owned by the fund, minus its liabilities, and then divided by the number of shares outstanding.

The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Company believes the valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

Equity securities did not include any INTL FCStone Inc. common stock as of September 30, 2012 and 2011, respectively.

The following tables summarize the Company’s pension assets, excluding cash held in the plan, by major category of plan assets measured at fair value on a recurring basis (at least annually) as of September 30, 2012 and 2011. For additional information and a detailed description of each level within the fair value hierarchy, see Note 3.



	September 30, 2012
(in millions)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	—	$	0.4	$	—	$	0.4
Fixed income:
Government and agencies	—		0.8		—		0.8
Collective funds:
Fixed income	—		7.7		—		7.7
Equities	—		16.6		—		16.6
Real estate	—		1.0		—		1.0
Total	$	—	$	26.5	$	—	$	26.5



	September 30, 2011
(in millions)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	—	$	0.5	$	—	$	0.5
Fixed income:
Government and agencies	—		0.9		—		0.9
Mutual funds	0.2		—		—		0.2
Collective funds:
Fixed income	—		6.0		—		6.0
Equities	—		15.5		—		15.5
Real estate	—		1.7		—		1.7
Total	$	0.2	$	24.6	$	—	$	24.8

Cash equivalents are mostly comprised of short-term money market instruments and the valuation is based on inputs derived from observable market data of related assets.

Fixed Income: These securities primarily include debt issued by the U.S. Department of Treasury and securities issued or backed by U.S. government sponsored entities and municipal bonds. These investments are valued utilizing a market approach that includes various valuation techniques and sources such as, broker quotes in active and non-active markets, benchmark yields and securities, reported trades, issuer spreads, and/or other applicable reference data and are generally classified within Level 2.

Mutual Funds: Mutual funds held by the Company’s plans are primarily invested in mutual funds with underlying common stock investments. The fair value of these investments is based on the net asset value of the units held in the respective fund which are determined by obtaining quoted prices on nationally recognized securities exchanges.

Collective Funds: These collective investment funds are unregistered investment vehicles that invest in portfolios of stock, bonds, or other securities. The value of equity collective funds is based upon review of the audited statement of the funds. Substantially all of the underlying investments in the funds were either Level 1 or Level 2 investments. As such, the plan has classified the investment in the funds (which is not exchange traded) as Level 2 investments. As of September 30, 2010, the value of a certain real estate collective fund was based upon review of the audited statement of the specific fund, in which substantially all of the underlying investments in the fund were Level 3 investments. Accordingly, the Company classified the investment in the funds (which was not exchange traded) as Level 3 investments. During fiscal 2011, the plans' assets in the certain real estate collective funds were sold, and no amounts relating to those instruments were held as of September 30, 2011.

The following table summarizes the changes in the Company’s Level 3 pension assets for the years ended September 30, 2012 and 2011:



(in millions)	Real Estate
Balance as of September 30, 2010	$	1.3
Sales	(1.3		)
Unrealized gains/(losses), net, relating to instruments still held at year end	—
Balance as of September 30, 2011	$	—
Purchases, sales, issuances and settlements, net	—
Unrealized gains/(losses), net, relating to instruments still held at year end	—
Balance as of September 30, 2012	$	—

The Company expects to contribute $2.5 million to the pension plans during fiscal 2013, which represents the minimum funding requirement. However, the Company is currently determining what voluntary pension plan contributions, if any, will be made in fiscal 2013.

The following benefit payments, which reflect expected future service, are expected to be paid:



(in millions)
Year ending September 30,
2013	$	4.3
2014	3.7
2015	3.3
2016	3.2
2017	2.8
2018 - 2022	9.2
	$	26.5

Defined Contribution Retirement Plans

Effective December 31, 2009, the Company discontinued its Savings Incentive Match Plan for Employees IRA (“SIMPLE IRA”), which allowed participating U.S. employees of INTL FCStone to contribute up to 100% of their salary, but not more than statutory limits. The Company contributed a dollar for each dollar of a participant’s contribution to this plan, up to a maximum contribution of 3% of a participant’s earnings. Under the SIMPLE IRA, employees are 100% vested in both the employee and employer contributions at all times.

U.K. based employees of INTL FCStone are eligible to participate in a defined contribution pension plan. The Company contributes double the employee’s contribution up to 10% of total base salary for this plan. For this plan, employees are 100% vested in both the employee and employer contributions at all times.

The Company offers participation in the INTL FCStone Inc. 401(k) Plan (“401(k) Plan”), a defined contribution plan providing retirement benefits, to all domestic employees who have reached 21 years of age, and provided four months of service to the Company. Employees may contribute from 1% to 80% of their annual compensation to the 401(k) Plan, limited to a maximum annual amount as set periodically by the Internal Revenue Service. The Company makes matching contributions to the 401(k) Plan in an amount equal to 62.5% of each participant’s eligible elective deferral contribution to the 401(k) Plan, up to 8%. Matching contributions vest, by participant, based on the following years of service schedule: less than two years – none, two to three years – 20%, three to four years – 40%, four to five years – 60%, and greater than five years – 100%.

For fiscal years ended 2012, 2011 and 2010, the Company’s contribution to these defined contribution plans were $3.7 million, $2.8 million and $2.1 million, respectively.

Employee Stock Ownership Plan

The FCStone Group Employee Stock Ownership Plan ("the Plan") was a defined contribution plan which was available to all full-time employees of FCStone and wholly subsidiaries who met established criteria of age and service, prior to the FCStone transaction. In connection with the FCStone transaction, the Board of Directors of FCStone elected to terminate the Plan as of December 31, 2009 (the "termination date"). As a result of an amendment to the Plan in 2009, no new participants were admitted to the Plan, and no additional contributions were made to the Plan for services performed by participants after the termination date. All participant account balances became 100% vested as of the termination date, and are not subject to forfeiture. During fiscal 2011, FCStone, the plan sponsor, received a favorable determination letter from the IRS with respect to the Plan, and has directed the trustee to distribute to the participants all remaining assets of the Plan which are distributable on account of the Plan's termination. All participant accounts were fully liquidated and distributed by October 13, 2011.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
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-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
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+ Details

Other Expenses (Notes)

12 Months Ended

Sep. 30, 2012

Other Expenses [Abstract]

Other Expenses [Text Block]

Other Expenses

Other expenses for the years ended September 30, 2012, 2011 and 2010 are comprised of the following:



	Year Ended September 30,
(in millions)	2012		2011		2010
Business development	$	11.2	$	8.9	$	6.3
Contingent consideration, net⁽¹⁾	2.9		4.7		—
Insurance	1.7		1.5		1.8
Advertising, meetings and conferences	2.4		1.8		1.7
Non-trading hardware and software maintenance and software licensing	2.2		2.8		1.3
Office supplies and printing	1.3		1.1		1.2
Other non-income taxes	4.0		2.8		1.3
Other	5.3		4.9		3.5
Total other expenses	$	31.0	$	28.5	$	17.1

(1) Contingent consideration includes remeasurement of contingent liabilities related to business combinations accounted for in accordance with the provisions of the Business Combinations Topic of the ASC (see Note 3) and additional purchase price, based on achieving specific conditions and earnings targets, relating to FCStone, LLC's previous acquisitions of Downes O'Neill, LLC ("Downes O'Neill") and Globecot, Inc. ("Globecot"). When the Downes O'Neill and Globecot acquisitions occurred, they were recorded in accordance with SFAS No. 141, Business Combinations ("SFAS 141"). As a result of the FCStone transaction on September 30, 2009, these contingent purchase price amounts were considered pre-acquisition contingencies, which were not reasonably estimable during the merger allocation period following the FCStone transaction. In accordance with SFAS 141, adjustments to pre-acquisition contingencies, made after the end of the allocation period, are included in earnings in the current period. There are no further contingent payments relating to the Downes O'Neill acquisition. See Note 11 for discussion of the remaining contingent payment related to the acquisition of Globecot.

Income Taxes (Notes)

12 Months Ended

Sep. 30, 2012

Income Taxes [Abstract]

Income Tax Disclosure [Text Block]

Income Taxes

Income tax expense (benefit) for the years ended September 30, 2012, 2011 and 2010 was allocated as follows:



	Year Ended September 30,
(in millions)	2012			2011			2010
Income tax expense attributable to income from continuing operations	$	4.4		$	22.5		$	6.4
Income tax expense attributable to loss from discontinued operations	—			0.1			0.6
Income tax expense attributable to extraordinary loss	—			—			5.8
Taxes allocated to stockholders' equity, related to unrealized gains (losses) on available-for-sale securities	2.2			(0.3		)	0.1
Taxes allocated to stockholders' equity, related to pension liabilities	(1.0		)	(1.7		)	(1.1		)
Taxes allocated to stockholders' equity, related to unrealized loss on derivatives	—			0.6			0.7
Taxes allocated to additional paid-in capital, related to stock-based compensation	(0.2		)	—			—
Total income tax expense	$	5.4		$	21.2		$	12.5

The components of the provision for income taxes attributable to income from continuing operations were as follows:



	Year Ended September 30,
(in millions)	2012			2011		2010
Current taxes:
U.S. Federal	$	(5.7	)	$	9.1	$	—
U.S. State and local	0.5			1.7		0.4
International	10.1			9.9		4.8
Total current taxes	4.9			20.7		5.2
Deferred taxes	(0.5		)	1.8		1.2
Income tax expense	$	4.4		$	22.5	$	6.4

U.S. and international components of income (loss) from continuing operations, before income taxes, was as follows:



	Year Ended September 30,
(in millions)	2012			2011		2010
U.S.	$	(13.7	)	$	27.3	$	4.4
International	33.0			32.2		13.5
Income from continuing operations, before tax	$	19.3		$	59.5	$	17.9

Items accounting for the difference between income taxes computed at the federal statutory rate and the provision for income taxes were as follows:



	Year Ended September 30,
	2012		2011		2010
Federal statutory rate effect of:	35.0	%	35.0	%	35.0	%
U.S. State income taxes	(1.2	)%	0.9	%	2.9	%
Foreign earnings taxed at lower rates	(16.7	)%	(2.9	)%	(7.0	)%
Change in foreign valuation allowance	1.8	%	0.7	%	5.0	%
Change in state valuation allowance	(0.2	)%	1.0	%	—	%
Tax impact of state rate change	—	%	1.1	%	—	%
Uncertain tax positions	(1.2	)%	1.4	%	—	%
Non-deductible meals and entertainment	2.2	%	—	%	(0.8	)%
Foreign permanent items	4.9	%	—	%	—	%
Other reconciling items	(3.4	)%	0.6	%	0.5	%
Effective rate	21.2	%	37.8	%	35.6	%

The components of deferred income tax assets and liabilities were as follows:



(in millions)	September 30, 2012			September 30, 2011
Deferred tax assets:
Stock-based compensation	$	2.5		$	1.9
Pension liability	6.1			5.5
Deferred compensation	3.2			4.0
Foreign net operating loss carryforwards	2.0			1.5
State net operating loss carryforwards	4.9			4.1
Intangible assets	6.1			5.0
Partnership tax basis timing differences	1.1			2.4
Bad debt reserve	0.1			1.1
Foreign tax credit	0.3			0.6
Other compensation	4.5			3.3
Other	1.2			1.2
Total gross deferred tax assets	32.0			30.6
Less valuation allowance	(4.1		)	(3.7		)
Deferred tax assets	27.9			26.9
Deferred income tax liabilities:
Unrealized gain on securities	3.1			1.1
Prepaid expenses	1.1			1.5
Fixed assets	3.8			3.6
Deferred income tax liabilities	8.0			6.2
Net deferred tax assets	$	19.9		$	20.7

Deferred income tax balances reflect the effects of temporary differences between the carrying amounts of assets and liabilities and their tax bases and are stated at enacted tax rates expected to be in effect when taxes are actually paid or recovered.

As of September 30, 2012 and 2011, respectively, the Company has net operating loss carryforwards for foreign and state income tax purposes of $2.8 million and $1.9 million, net of valuation allowances, which are available to offset future foreign and state taxable income. The net operating loss carryforwards expire in tax years ending in 2020 through 2030.

The valuation allowance for deferred tax assets as of September 30, 2012 was $4.1 million. The net change in the total valuation allowance for the year ended September 30, 2012 was an increase of $0.4 million. The valuation allowances as of September 30, 2012 and 2011, respectively, were primarily related to state and foreign net operating loss carryforwards that, in the judgment of management, are not more likely than not to be realized. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some or all of the deferred tax assets will not be realized. Based on the level of historical taxable income and projections for future taxable income, management believes that it is more likely than not that the Company will realize the tax benefit of the deferred tax assets, net of the existing valuation allowance, in the future.

The total amount of undistributed earnings in the Company’s foreign subsidiaries, for income tax purposes, was $130.7 million and $75.7 million as of September 30, 2012 and 2011, respectively. It is the Company’s current intention to reinvest undistributed earnings of its foreign subsidiaries in the foreign jurisdictions, resulting in the indefinite postponement of the remittance of those earnings. Accordingly, no provision has been made for foreign withholding taxes or United States income taxes which may become payable if undistributed earnings of foreign subsidiaries were paid as dividends to the Company.

The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authority, based upon the technical merits of the position. The tax benefit recognized in the financial statements from such a position is measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement.

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:



	Year Ended September 30,
(in millions)	2012			2011		2010
Balance, beginning of year	$	0.9		$	—	$	—
Gross increases for tax positions related to current year	—			—		—
Gross increases for tax positions related to prior years	—			0.9		—
Gross decreases for tax positions of prior years	(0.1		)	—		—
Settlements	(0.1		)	—		—
Lapse of statute of limitations	(0.2		)	—		—
Balance, end of year	$	0.5		$	0.9	$	—

Included in the balance of uncertain tax benefits as of September 30, 2012, is $0.3 million of tax benefits that, if recognized, would affect the effective tax rate. While it is expected that the amount of unrecognized tax benefits will change in the next twelve months, the Company does not expect this change to have a material impact on the results of operations or the financial position of the Company.

Accrued interest and penalties are included within the related tax liability line in the consolidated balance sheets. Accrued interest, net of federal benefit, and penalties included in the consolidated balance sheets as of September 30, 2012 and 2011 was $0.2 million, respectively.

The Company recognizes accrued interest and penalties related to income taxes as a component of income tax expense. During 2012, 2011 and 2010, the amount of interest, net of federal benefit, and penalties recognized as a component of income tax expense was $0.3 million, $0.2 million and nil, respectively.

The Company and its subsidiaries file income tax returns with the U.S. federal jurisdiction and various state and foreign jurisdictions. The Company has open tax years ranging from September 30, 2006 through September 30, 2011 with various taxing authorities. The Internal Revenue Service commenced an examination of the U.S. income tax return of FCStone for its fiscal year ended August 31, 2009, which was prior to acquisition. This examination was settled during 2012 with no adjustments. FCStone is a wholly-owned subsidiary acquired on September 30, 2009. Additionally, both INTL FCStone Inc. and FCStone are under separate state examinations for various periods, ranging from August 31, 2006 through September 30, 2009.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 740
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Acquisitions (Notes)	12 Months Ended
Acquisitions (Notes)	Sep. 30, 2012
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Acquisitions Acquisitions in 2012 During fiscal year 2012, the Company acquired three businesses (Coffee Network, TRX Futures Limited and Aporte DTVM) and certain assets of the Metals Division of MF Global UK Limited, which were not considered significant on an individual or aggregate basis. The Company’s consolidated financial statements include the operating results of the acquired businesses from the dates of acquisition. The total amount of goodwill and intangible assets, in connection with these acquisitions, that is expected to be deductible for tax purposes is $0.7 million as of September 30, 2012. Coffee Network In November 2011, the Company entered into an agreement to acquire 100% of the ownership interests in Coffee Network LLC ("Coffee Network"), an online news and analysis portal for the global coffee industry. Coffee Network provides up-to-the-minute news and in-depth analysis to subscribers around the globe from a network of correspondents and commodity analysts located in key coffee producing and consuming regions. These services provide a unique information solution to subscribers and a competitive advantage in today's information-driven marketplace. The purchase price for the Coffee Network acquisition consists of an initial payment of $0.2 million, three additional annual contingent payments and a final contingent payment. See Note 11 for discussion of the contingent payments. The present value of the estimated total purchase price, including contingent consideration, is less than $0.3 million. The value of certain assets and liabilities are preliminary in nature, and are subject to adjustment as additional information is obtained, including but not limited to the finalization of the calculation of the contingent consideration and valuation of separately identifiable intangible assets. The intangible assets recognized in this transaction were assigned to the C&RM segment. Purchase costs allocated to intangible assets with determinable useful lives are $0.2 million, which are being amortized over the remaining useful lives of the assets, and include customer relationships, websites and non-compete agreements (approximate two-year weighted-average useful life). These areas are subject to change within the measurement period (up to one year from the acquisition date) as valuations are finalized. When the valuations are finalized, any changes to the preliminary valuation of assets acquired or liabilities assumed may result in adjustments to separately identifiable intangible assets and goodwill. MF Metals Team On November 25, 2011, INTL FCStone (Europe) Ltd, the Company's wholly owned subsidiary in the United Kingdom ("UK"), arranged with the administrator of MF Global's UK operations to acquire certain assets of the Metals Division of MF Global UK Limited (in special administration). As part of the arrangement, the Company received an assignment of customer accounts and customer account documentation. Additionally, as part of the transaction, the Company hired more than 50 professionals from MF Global's metals trading business based in London. This business serves institutional investors and financial services firms in the Americas, Europe and the Asia-Pacific region. The Company has allocated equity capital to integrate these brokers and their customers into the Company's operations, through a combination of increased regulatory capital to support the accounts of these customers and increased compensation and related personnel costs for the brokers. The amount of the required capital depends upon the activity in and balances of the customer accounts. The purchase price of the acquisition of certain assets from MF Global was $1.0 million. There was no contingent consideration associated with this transaction. The allocation of the purchase price to separately identifiable intangible assets is preliminary in nature, and is subject to adjustment as additional information is obtained. The intangible assets recognized in this transaction were assigned to the C&RM segment. Purchase costs allocated to intangible assets with determinable useful lives are $0.5 million, which are being amortized over the remaining useful lives of the assets, and include customer relationships (approximate three-year weighted-average useful life). TRX Futures Limited On April 30, 2012, the Company's wholly-owned subsidiary in the UK, INTL Holding (UK) Limited, acquired 100% of the outstanding shares of TRX Futures Limited ("TRX") from Neumann Gruppe GmbH. TRX is a London-based niche clearing firm for commercial coffee and cocoa customers, as well as energy and financial products. The purchase price was equal to the tangible net asset value of TRX, which was approximately $12.9 million. There are no additional payments remaining for this acquisition. The valuation of certain assets and liabilities is preliminary in nature, and is subject to adjustment as additional information is obtained, including but not limited to the valuation of separately identifiable intangible assets, if applicable. The goodwill recognized in this transaction was assigned to the C&RM segment. Purchase costs allocated to goodwill of $0.3 million was calculated as the excess of the fair value of the consideration transferred over the fair value of the identified net assets acquired and liabilities assumed, and is expected to be deductible for tax purposes. These areas are subject to change within the measurement period (up to one year from the acquisition date) as valuations are finalized. When the valuations are finalized, any changes to the preliminary valuation of assets acquired or liabilities assumed may result in adjustments to separately identifiable intangible assets and goodwill. Aporte DTVM In February 2012, the Company's subsidiaries, INTL Participacoes LTDA and FCStone do Brasil, acquired 100% of the shares of Aporte DTVM. Following the acquisition, Aporte DTVM was renamed INTL FCStone DTVM Ltda. INTL FCStone DTVM is based in Brazil and is a broker-dealer regulated by the Central Bank of Brazil. The purchase price for the acquisition of the shares of Aporte DTVM was $1.5 million. There are no additional payments remaining for this acquisition. The value of certain assets and liabilities are preliminary in nature, and are subject to adjustment as additional information is obtained, including but not limited to the valuation of separately identifiable intangible assets, if applicable. The goodwill recognized in this transaction was assigned to the C&RM segment. Purchase costs allocated to goodwill of $0.8 million was calculated as the excess of the fair value of the consideration transferred over the fair value of the identified net assets acquired and liabilities assumed, and is expected to be deductible for tax purposes. These areas are subject to change within the measurement period as valuations are finalized. When the valuations are finalized, any changes to the preliminary valuation of assets acquired or liabilities assumed may result in adjustments to separately identifiable intangible assets and goodwill. Acquisitions in 2011 During fiscal year 2011, the Company acquired two businesses, Hencorp Futures and Ambrian Commodities Limited, and certain assets from Hudson Capital Energy, LLC, which were not considered significant on an individual or aggregate basis. The Company’s consolidated financial statements include the operating results of the two businesses and certain purchased assets from the dates of acquisition. The total amount of goodwill and intangible assets, in connection with these acquisitions, that is deductible for tax purposes was $4.9 million as of September 30, 2011. Hencorp Futures In October, 2010, the Company acquired all of the ownership interests in Hencorp Futures, the commodity futures operation of Miami-based Hencorp Group. Hencorp Futures specializes in the development and execution of risk-management programs designed to hedge price volatility in a number of widely traded commodities, including coffee, sugar, cocoa, grains and energy products. The transaction will enable the Company to round out its portfolio of commodity risk management services to include a more robust capability in soft commodities, especially coffee, where Hencorp Futures has established a substantial presence and reputation globally, and especially in Central and South America. The purchase price of the Hencorp Futures acquisition consisted of an initial payment of $2.3 million, two payments totaling $1.4 million and representing the adjusted tangible equity of Hencorp Futures as of September 30, 2011, an amount due of $0.3 million based on the adjusted pre-tax net earnings of Hencorp Futures for the fiscal year ended September 30, 2011, three additional annual contingent payments and a final contingent payment. See Note 11 for discussion of the contingent payments. The present value of the estimated total purchase price, including contingent consideration, is $6.4 million. The Company obtained a third-party valuation of the intangible assets and contingent liabilities, and allocated the purchase costs among tangible assets, identified intangible assets with determinable useful lives, intangible assets with indefinite lives and goodwill. The intangible assets and goodwill recognized in this transaction were assigned to the C&RM segment. Purchase costs allocated to intangible assets with determinable useful lives are $1.7 million, which are being amortized over the remaining useful lives of the assets, and include customer relationships of $1.3 million (twenty-year weighted-average useful life) and non-compete agreements of $0.4 million (two-year weighted-average useful life). Purchase costs allocated to intangible assets with indefinite lives are $0.8 million, and relate to a trade name. See discussion in Note 9 for discussion of the impairment of the Hencorp Futures trade name during the fiscal year ended September 30, 2012. Goodwill of $2.1 million was calculated as the excess of the fair value of the consideration transferred over the fair value of the identified net assets acquired and liabilities assumed, and is expected to be deductible for tax purposes. During 2012, Hencorp Futures was reorganized as a division of FCStone, LLC. Certain Asset Purchased from Hudson Capital Energy, LLC In April 2011, the Company acquired certain assets from Hudson Capital Energy LLC ("HCEnergy"), a New York-based energy risk-management firm. The transaction enables the Company's energy risk management services to include a more robust capability in crude oil and refined products. HCEnergy is a specialist in exchange cleared options, swaps and futures, and has grown its business to include hedging and trading professionals across the spectrum of global petroleum products. The purchase price of the acquisition of certain assets from HCEnergy consisted of the aggregate net asset value of certain commodity futures brokerage accounts and certain proprietary software, totaling $1.0 million. There was no contingent consideration associated with this transaction. The Company has made an allocation of the purchase costs among tangible assets. There were no intangible assets or goodwill recognized in this transaction. Ambrian Commodities Limited In August 2011, the Company's wholly owned subsidiary in the United Kingdom, INTL Global Currencies Limited, acquired the issued share capital of Ambrian Commodities Limited (“Ambrian”), the London Metals Exchange brokerage subsidiary of Ambrian Capital Plc. Ambrian was subsequently renamed INTL FCStone (Europe) Ltd. ("INTL FCStone Europe"). INTL FCStone Europe, a non-clearing LME member, specializes in the development and execution of risk-management programs designed to hedge price fluctuations in base metals for a wide variety of producers, manufacturers and fabricators. INTL FCStone Europe has a niche focus on smaller industrial clients, including lead recyclers, brass producers, zinc galvanizers, metal refineries and copper foil producers that use LME futures and options for hedging raw material costs or output prices. At closing, the Company paid $7.1 million, representing the net asset value of Ambrian less certain intercompany balances due to Ambrian from its affiliates. There was no contingent consideration associated with this transaction. The Company has allocated the purchase costs among tangible assets. There were no intangible assets or goodwill recognized in this transaction. Acquisitions in 2010 During fiscal year 2010, the Company acquired three separate business groups, Risk Management Incorporated and RMI Consulting, Inc, Hanley Group and Provident Group, which were not considered significant on an individual or aggregate basis. The Company’s consolidated financial statements include the operating results of each business from the dates of acquisition. The total amount of goodwill and intangible assets, in connection with these acquisitions, that is deductible for tax purposes was $39.8 million as of September 30, 2010. Risk Management Incorporated and RMI Consulting, Inc. In April 2010, the Company acquired all of the outstanding capital stock of Risk Management Incorporated and RMI Consulting, Inc. (the “RMI Companies”). The RMI Companies provides execution and consulting services to some of the largest natural gas consumers in North America, including municipalities and large manufacturing firms, as well as major utilities. In addition to the risk-management and brokerage services, the RMI Companies also offer a wide range of other programs, including a proprietary on-line energy procurement platform. The acquisition adds extensive and proven expertise in the natural gas, electricity and related energy markets where the RMI Companies have a leading presence, as well as a broad range of long-term relationships with some major organizations. The purchase price for the acquisition of the RMI Companies consisted of an initial payment of $6.0 million, which was paid during the year ended September 30, 2010, a payment of $3.1 million, based on the net income of the RMI Companies for the twelve-month period ended March 31, 2011, which was paid during the year ended September 30, 2011 and two contingent payments. See Note 11 for discussion of the contingent payments. The present value of the estimated total purchase price, including contingent consideration, is $15.2 million. The Company obtained a third-party valuation of the intangible assets and contingent liabilities, and allocated the purchase costs among tangible assets, identified intangible assets, with determinable useful lives, intangible assets with indefinite lives and goodwill. Purchase costs allocated to intangible assets with determinable useful lives are amortized over the remaining useful lives of the assets. The intangible assets and goodwill recognized in this transaction were assigned to the Consulting and Risk Management (“C&RM”) segment. The intangible assets recognized included customer relationships of $7.0 million (20 year useful life); software programs and platforms of $0.8 million (five year useful life) and trade name of $1.2 million (indefinite useful life). The goodwill is calculated as the excess of the fair value of the consideration transferred over the fair value of the identified net assets acquired and liabilities assumed. Purchase costs allocated to goodwill were $7.7 million. During 2012, the RMI Companies were reorganized as divisions of FCStone, LLC. Hanley Companies In July 2010, the Company acquired all of the outstanding membership interests in HGC Trading, LLC; HGC Asset Management, LLC; HGC Advisory Services, LLC; Hanley Alternative Trade Group, LLC and HGC Office Services, LLC (the "Hanley Companies"). The Hanley Companies were engaged in the business of acting as market makers and dealers in exchange traded options and futures on soft commodities; executing and trading derivatives on soft commodities in the over the counter market; and providing related advisory services. The purchase price for the acquisition of the Hanley Companies consisted of an initial payment of $7.5 million, which was paid during the year ended September 30, 2010, two payments equaling $24.3 million, for the adjusted net asset value of the Hanley Companies as of June 30, 2010, of which $18.2 million and $6.1 million was paid during the year ended September 30, 2011 and 2010, respectively, a payment of $6.3 million, based on specific results of the Hanley Companies for the twelve-month period ended June 30, 2011, which was paid during the year ended September 30, 2011, two annual contingent payments and a final contingent payment. See Note 11 for discussion of the contingent payments. The present value of the estimated total purchase price, including contingent consideration is $51.6 million. At closing, the Company and the sellers of the Hanley Companies entered into an option agreement (the "Option Agreement"), pursuant to which the sellers of the Hanley Companies have the right to elect, in their discretion, to receive up to thirty percent (30%) of the final contingent EBIT Payment in the form of restricted shares of the common stock of the Company. The Option may be exercised by the sellers of the Hanley Companies at any time during the twenty day period commencing on June 30, 2013. The option price will be equal to the greater of: (i) $16.00 per share, or (ii) seventy five percent (75%) of the fair value of the common stock of the Company as of June 30, 2013. The maximum number of restricted shares issuable upon the exercise of the Option is 187,500 shares. The restricted shares will be subject to restrictions on transfer which will lapse at the rate of one-third per year over the three year period commencing on June 30, 2013. The Option Agreement was included in determining the fair value of the contingent consideration. The Company obtained a third-party valuation of the intangible assets and contingent liabilities, and allocated the purchase costs among tangible assets, identified intangible assets, with determinable useful lives, intangible assets with indefinite lives and goodwill. Purchase costs allocated to intangible assets with determinable useful lives are amortized over the remaining useful lives of the assets. The intangible assets and goodwill recognized in this transaction were assigned to the C&RM segment. The intangible assets recognized include customer relationships of $0.2 million (five year useful life); software programs and platforms of $1.2 million (five year useful life), non-compete agreements of $2.9 million (three year useful life) and trade name of $0.1 million (indefinite useful life). Goodwill is calculated as the excess of the fair value of the consideration transferred over the fair value of the identified net assets acquired and liabilities assumed. Purchase costs allocated to goodwill were $18.7 million. As part of the acquisition of the Hanley Companies, the Company acquired a majority interest in the Blackthorn Fund. See additional discussion of the Blackthorn Fund in Note 1. Provident Group In September 2010, the Company acquired certain assets of Provident Group (“Provident”), a New York-based investment banking and advisory firm. Under terms of the acquisition agreement, the Company acquired assets secured the services of the individual sellers, as set forth in the agreement. Provident is engaged in the business of providing investment banking services. Provident will play a critical role in building out a comprehensive investment banking and advisory platform delivering financing solutions to the middle market. The purchase price for the assets and services of the sellers was $5.0 million. Subsequent to closing, the individual sellers placed the entire purchase price into an escrow account and the funds were used to purchase outstanding shares of the Company on the open market. There were 214,325 shares purchased and placed into escrow as a result of this agreement, with 8,700 shares being purchased during 2010, and 205,625 shares being purchased during 2011. The entire purchase price was recorded as a reduction in additional paid in capital as shares held in escrow for business combinations. The shares held in escrow for business combinations will be released to the individual sellers, over a five year period from the date of closing based on net profits, in accordance with the provisions of the acquisition agreement. As dividend and voting rights on these shares reside with the sellers throughout the time they are held in escrow, they are considered participating securities under the two-class method. Upon the release of the shares, they will be owned by the individual sellers free and clear of any further encumbrance under the acquisition agreement or the custody agreement and the Company will reduce the shares held in escrow for business combinations amounts. However, if the terms of the agreement are not met, the remaining shares will be forfeited and the remaining shares and balance in the shares held in escrow for business combinations will be recorded as treasury stock. During the year ended September 30, 2012, 3,255 shares were earned and subsequently released to the sellers. The Company obtained a third-party valuation of the intangible assets and allocated the purchase costs among tangible assets, an identified intangible asset, with a determinable useful life, and an intangible asset with an indefinite life. Purchase price consideration of $0.2 million was allocated to customer relationships, an intangible asset with a determinable useful life of two years, over which the cost will be amortized. Purchase costs allocated to intangible assets with indefinite lives were $0.2 million, and relate to a trade name. The intangible assets recognized in this transaction were assigned to the Securities segment. Negative goodwill of $0.4 million was recognized as a gain on bargain purchase in the consolidated income statement as a result of the identification of intangible assets upon completion of purchase accounting during the first quarter of 2011.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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+ Details

Discontinued Operations	12 Months Ended
Discontinued Operations	Sep. 30, 2012
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	Discontinued Operations As of December 31, 2009, the Company owned 80% of the shares outstanding of Agora-X, LLC (“Agora”) and the Company’s consolidated balance sheet and income statement as of December 31, 2009, reflected the Company’s consolidation of Agora. On February 12, 2010, the Company and NASDAQ OMX (“NASDAQ”), the non-controlling interest holder prior to this purchase transaction, signed a restructuring agreement, effective January 1, 2010, whereby NASDAQ acquired an additional 65% interest in Agora in exchange for an investment of $6.6 million. In accordance with the Consolidation Topic of the ASC, since the Company no longer had a controlling financial interest, it deconsolidated the subsidiary from the date of the agreement. The Company retained a 15% noncontrolling ownership interest in Agora. The Company recorded its retained noncontrolling interest percentage under the equity method, in accordance with the guidance in the Investments – Equity Method and Joint Ventures Topic of the ASC. On June 10, 2010, the board of directors of Agora agreed to discontinue the operations of the entity. In evaluating the fair value of the Company’s investment in Agora during the third quarter of fiscal year 2010, it was determined that its carrying value would no longer be recoverable and was in fact impaired. The Company wrote down its investment in Agora to zero, which resulted in a $0.5 million impairment charge. Since the discontinuation of operations of Agora occurred within the one year assessment period, beginning with the Company’s loss of controlling interest, the Company determined that Agora had met the criteria established with the guidance in the Presentation of Financial Statements – Discontinued Operations Topic of the ASC for reporting discontinued operations. In accordance with the guidance, the results of Agora, including the Company’s ownership percentage share of the losses and impairment charge for the remaining investment in Agora from January 1, 2010 through September 30, 2010, were included within discontinued operations, net of tax, on the consolidated income statement for 2010. For fiscal 2010, the Company recorded a pre-tax gain of $1.9 million and a gain, net of tax, of $1.3 million, related to Agora within discontinued operations. During 2011, the Company recognized a gain of $0.2 million, net of taxes, related to the final liquidation of Agora, within discontinued operations. The results of Agora were previously included within the Other segment. In May 2010, the Company sold its interest in INTL Capital Limited ("INTL Capital") to an independent third party for a purchase price equal to book value. The subsidiary operated an asset management business in Dubai. Subsequent to the sale of its subsidiary, the Company liquidated its position in the INTL Trade Finance Fund Limited, a fund managed by INTL Capital. This fund invested primarily in global trade finance-related assets. For 2010, the Company recorded losses, net of tax, related to INTL Capital of $0.7 million within discontinued operations. The results of operations for INTL Capital were previously included within the Other segment.

- Definition

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

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+ Details

Quarterly Financial Information

12 Months Ended

Sep. 30, 2012

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

Quarterly Financial Information (Unaudited)

The Company has set forth certain quarterly unaudited financial data for the past two years in the tables below:



	For the 2012 Fiscal Quarter Ended
(in millions, except per share amounts)	September 30		June 30		March 31		December 31
Total revenues	17,668.1		17,351.1		16,951.0		17,290.4
Cost of sales of physical commodities	17,550.1		17,227.3		16,831.4		17,194.1
Operating revenues	$	118.0	$	123.8	$	119.6	$	96.3
Interest expense	3.3		2.6		3.6		2.1
Net revenues	114.7		121.2		116.0		94.2
Total non-interest expense	104.2		115.3		112.4		94.9
Income (loss), before tax	10.5		5.9		3.6		(0.7		)
Income tax expense (benefit)	2.2		1.2		1.2		(0.2		)
Net income (loss)	8.3		4.7		2.4		(0.5		)
Add: Net loss attributable to noncontrolling interests	—		—		—		0.1
Net income (loss) attributable to INTL FCStone Inc. common stockholders	$	8.3	$	4.7	$	2.4	$	(0.4	)
Net basic earnings (loss) per share	$	0.44	$	0.24	$	0.13	$	(0.02	)
Net diluted earnings (loss) per share	$	0.42	$	0.23	$	0.12	$	(0.02	)



	For the 2011 Fiscal Quarter Ended
(in millions, except per share amounts)	September 30			June 30		March 31		December 31
Total revenues	$	24,070.4		$	20,573.4	$	14,583.0	$	16,270.8
Cost of sales of physical commodities	$	23,962.3		$	20,468.0	$	14,470.0	$	16,174.1
Operating revenues	$	108.1		$	105.4	$	113.0	$	96.7
Interest expense	2.2			2.0		3.3		3.8
Net revenues	105.9			103.4		109.7		92.9
Total non-interest expense	92.9			86.1		86.4		87.0
Income from continuing operations, before tax	13.0			17.3		23.3		5.9
Income tax expense	5.4			7.0		8.0		2.1
Income from continuing operations	7.6			10.3		15.3		3.8
Income from discontinued operations	—			—		—		0.2
Net income	7.6			10.3		15.3		4.0
Add: Net (income) loss attributable to noncontrolling interests	(0.1		)	0.1		0.1		—
Net income attributable to INTL FCStone Inc. common stockholders	$	7.5		$	10.4	$	15.4	$	4.0
Net basic earnings per share	$	0.41		$	0.58	$	0.87	$	0.23
Net diluted earnings per share	$	0.39		$	0.55	$	0.81	$	0.22

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

Segment and Geographic Information (Notes)

12 Months Ended

Sep. 30, 2012

Segment Analysis [Abstract]

Segment Reporting Disclosure [Text Block]

Segment and Geographic Information

The Company reports its operating segments based on services provided to customers. The Company’s activities are divided into the following five functional areas:


•	Commodity and Risk Management Services


•	Foreign Exchange


•	Securities


•	Clearing and Execution Services


•	Other

Commodity and Risk Management Services (C&RM)

The Company serves its commercial customers through its force of approximately 188 risk management consultants with a high value added service that differentiates the Company from other competitors and maximizes the opportunity to retain customers. The Integrated Risk Management Program ("IRMP®") involves providing customers with commodity risk management consulting services that are designed to develop a customized long term hedging program to help them mitigate their exposure to commodity price risk and maximize the amount and certainty of their operating profits. Customers are assisted in the execution of their hedging strategies through the Company’s exchange-traded futures and options clearing and execution operations and through access to more customized alternatives provided by the OTC trading desk. Generally, customers direct their own trading activity and risk management consultants do not have discretionary authority to transact trades on behalf of customers. When transacting OTC contracts with customers, the Company may offset the customer’s transaction simultaneously with one of its trading counterparties. Alternatively, the OTC trade desk will accept a customer transaction and offset that transaction with a similar but not identical position on the exchange.

In addition, the Company provides a full range of trading and hedging capabilities to select producers, consumers, recyclers and investors in precious metals and certain base metals. Acting as a principal, the Company commits its own capital to buy and sell the metals on a spot and forward basis.

The Company records its physical commodities revenues on a gross basis. Operating revenues and losses from the Company’s commodities derivatives activities are included within ‘trading gains, net’ in the consolidated income statements. Inventory for the commodities business is valued at the lower of cost or fair value under the provisions of the Inventory Topic of the ASC. The Company generally mitigates the price risk associated with commodities held in inventory through the use of derivatives. The Company does not elect hedge accounting under U.S. GAAP in accounting for this price risk mitigation. In such situations, unrealized gains in inventory are not recognized under U.S. GAAP, but unrealized gains and losses in related derivative positions are recognized under U.S. GAAP. As a result, the Company’s reported earnings from commodities trading may be subject to significant volatility when calculated under U.S. GAAP.

Foreign Exchange

The Company provides treasury, global payment and foreign exchange services to financial institutions, multi-national corporations, government organizations and charitable organizations as well as assisting commercial customers with the execution of foreign exchange hedging strategies. The Company transacts in over 130 currencies and specializes in smaller, more difficult emerging markets where there is limited liquidity. In addition, the Company executes trades based on the foreign currency flows inherent in the Company’s existing business activities. The Company primarily acts as a principal in buying and selling foreign currencies on a spot basis. The Company derives revenue from the difference between the purchase and sale prices.

The Company also provides spot foreign currency trading for a customer base of eligible contract participants and high net worth retail customers as well as operating a proprietary foreign exchange desk which arbitrages the futures and cash markets.

Securities

Through INTL FCStone Securities Inc., the Company acts as a wholesale market maker in select foreign securities including unlisted ADRs and foreign ordinary shares. INTL FCStone Securities Inc. provides execution and liquidity to national broker-dealers, regional broker-dealers and institutional investors.

The Company also originates, structures and places a wide array of emerging market debt instruments in the international and domestic capital markets. These instruments include complex asset backed securities, unsecured bond and loan issues, negotiable notes and other trade-related debt instruments used in cross-border trade finance. On occasions the Company may invest its own capital in debt instruments before selling them. It also actively trades in a variety of international debt instruments.

Clearing and Execution Services (CES)

The Company seeks to provide competitive and efficient clearing and execution of exchange-traded futures and options for the institutional and professional trader market segments. Through its platform, customer orders are accepted and directed to the appropriate exchange for execution. The Company then facilitates the clearing of customers’ transactions. Clearing involves the matching of customers’ trades with the exchange, the collection and management of margin deposits to support the transactions, and the accounting and reporting of the transactions to customers. The Company seeks to leverage its capabilities and capacity by offering facilities management or outsourcing solutions to other FCMs.

Other

This segment consists of the Company’s asset management and commodity financing and facilitation business. The asset management revenues include fees, commissions and other revenues received by the Company for management of third party assets and investment gains or losses on the Company’s investments in funds and proprietary accounts managed either by the Company’s investment managers or by independent investment managers.

The Company operates a commodity financing and facilitation business which provides financing to commercial commodity-related companies against physical inventories, including grain, lumber, meats, energy products and renewable fuels. Sale and repurchase agreements are used to purchase commodities evidenced by warehouse receipts, subject to a simultaneous agreement to sell such commodities back to the original seller at a later date. These transactions are accounted for as product financing arrangements, and accordingly no commodity inventory, purchases or sales are recorded. Additionally, the Company, as a principal, engages in physical purchase and sale transactions related to inputs to the renewable fuels and feed ingredient industries.

********

The total revenues reported combine gross revenues for the physical commodities business and net revenues for all other businesses. In order to reflect the way that the Company’s management views the results, the tables below also reflect the segment contribution to ‘operating revenues’, which is shown on the face of the consolidated income statements and which is calculated by deducting physical commodities cost of sales from total revenues.

Segment data includes the profitability measure of net contribution by segment. Net contribution is one of the key measures used by management to assess the performance of each segment and for decisions regarding the allocation of the Company’s resources. Net contribution is calculated as revenue less direct cost of sales, clearing and related expenses, variable compensation, introducing broker commissions and interest expense. Variable compensation paid to risk management consultants / traders generally represents a fixed percentage of an amount equal to revenues generated, and in some cases, revenues produced less clearing and related charges, base salaries and an overhead allocation.

Segment data also includes segment income which is calculated as net contribution less non-variable direct expenses of the segment. These non-variable direct expenses include trader base compensation and benefits, operational employee compensation and benefits, communication and data services, business development, professional fees, bad debt expense and other direct expenses.

Inter-segment revenues, charges, receivables and payables are eliminated upon consolidation, except revenues and costs related to foreign currency transactions undertaken on an arm’s length basis by the foreign exchange trading business for the securities business. The foreign exchange trading business competes for this business as it does for any other business. If its rates are not competitive, the securities businesses buy or sell their foreign currency through other market counterparties.

On a recurring basis, the Company sweeps excess cash from certain operating segments to a centralized corporate treasury function in exchange for an intercompany receivable asset. The intercompany receivable asset is eliminated during consolidation, and therefore this practice may impact reported total assets between segments.

Information concerning operations in these segments of business is shown in accordance with the Segment Reporting Topic of the ASC as follows:



	Year Ended September 30,
(in millions)	2012			2011		2010
Total revenues:
Commodity and Risk Management Services	$	68,928.3		$	75,274.1	$	46,785.2
Foreign Exchange	62.6			59.3		47.5
Securities	39.9			30.5		20.8
Clearing and Execution Services	93.8			66.1		61.8
Other	136.2			67.2		24.8
Corporate unallocated	(0.2		)	0.4		0.2
Total	$	69,260.6		$	75,497.6	$	46,940.3
Operating revenues (loss):
Commodity and Risk Management Services	$	246.0		$	252.6	$	129.8
Foreign Exchange	62.6			59.3		47.5
Securities	39.9			30.5		20.8
Clearing and Execution Services	93.8			66.1		61.8
Other	15.6			14.3		8.9
Corporate unallocated	(0.2		)	0.4		0.2
Total	$	457.7		$	423.2	$	269.0
Net contribution:
(Revenues less cost of sales, clearing and related expenses, variable bonus compensation, introducing broker commissions and interest expense):
Commodity and Risk Management Services	$	143.0		$	151.6	$	70.9
Foreign Exchange	41.3			37.1		28.0
Securities	19.8			16.5		11.4
Clearing and Execution Services	14.3			14.3		10.7
Other	10.3			10.0		7.1
Total	$	228.7		$	229.5	$	128.1
Net segment income:
(Net contribution less non-variable direct segment costs):
Commodity and Risk Management Services	$	69.7		$	93.5	$	32.8
Foreign Exchange	28.3			28.0		21.8
Securities	4.5			1.9		5.6
Clearing and Execution Services	2.2			4.9		1.1
Other	5.4			5.6		3.7
Total	$	110.1		$	133.9	$	65.0
Reconciliation of segment income to income from continuing operations, before tax:
Net segment income	$	110.1		$	133.9	$	65.0
Costs not allocated to operating segments	90.8			74.4		47.1
Income from continuing operations, before tax	$	19.3		$	59.5	$	17.9

(in millions)	As of September 30, 2012			As of September 30, 2011
Total assets:
Commodity and Risk Management Services	$	1,449.2		$	1,540.8
Foreign Exchange	124.5			146.1
Securities	88.7			104.8
Clearing and Execution Services	1,090.9			734.4
Other	110.8			43.4
Corporate unallocated	94.8			66.2
Total	$	2,958.9		$	2,635.7

Information regarding revenues and operating revenues for the years ended September 30, 2012, 2011 and 2010, and information regarding long-lived assets (defined as property, equipment, leasehold improvements and software) as of September 30, 2012 and 2011 in geographic areas were as follows:



	Year Ended September 30,
(in millions)	2012		2011		2010
Total revenues:
United States	$	55,564.8	$	53,660.2	$	31,962.7
Europe	69.9		35.1		20.4
South America	58.2		53.3		17.8
Asia	13,555.3		21,738.4		14,926.6
Other	12.4		10.6		12.8
Total	$	69,260.6	$	75,497.6	$	46,940.3

Operating revenues:
United States	$	297.3	$	302.1	$	213.4
Europe	69.9		35.1		20.4
South America	58.2		53.3		17.8
Asia	19.9		27.6		14.4
Other	12.4		5.1		3.0
Total	$	457.7	$	423.2	$	269.0

(in millions)	As of September 30, 2012		As of September 30, 2011
Long-lived assets, as defined:
United States	$	11.5	$	10.7
Europe	3.8		2.0
South America	2.8		1.6
Asia	0.7		0.6
Other	0.1		0.1
Total	$	18.9	$	15.0

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Subsequent Events	12 Months Ended
Subsequent Events	Sep. 30, 2012
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events In October 2012, the Company reached an agreement in which Tradewire Securities, LLC, a Miami-based securities broker-dealer servicing customers throughout Latin America and a wholly-owned subsidiary of Tradewire Group Ltd., has agreed to transfer its institutional accounts to INTL FCStone Inc.'s broker-dealer subsidiary, INTL FCStone Securities. Completion of this transaction is expected to occur in mid-December 2012. Tradewire Securities, LLC provides global brokerage services to institutions and individual investors directly and through a global network of partners. With its experienced team, Tradewire Securities, LLC services a wide range of customers, including hedge funds, pension funds, broker-dealers and banks located in Latin America, Caribbean, North America and Europe.

Condensed Parent Only Financial Statements [Schedule]

12 Months Ended

Sep. 30, 2012

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Financial Information of Parent Company Only Disclosure [Text Block]

Schedule I

INTL FCStone Inc.

Condensed Balance Sheets

Parent Company Only



(in millions)	September 30, 2012			September 30, 2011
ASSETS
Cash and cash equivalents	$	13.1		$	2.0
Receivables from subsidiaries	20.1			43.9
Notes receivable, net	10.2			—
Income taxes receivable	14.3			21.4
Financial instruments owned, at fair value	1.5			3.2
Investment in subsidiaries⁽¹⁾	220.1			207.9
Deferred income taxes	0.9			0.8
Property and equipment, net	4.3			2.6
Goodwill and intangible assets, net	—			0.3
Other assets	3.4			3.5
Total assets	$	287.9		$	285.6
LIABILITIES AND EQUITY
Liabilities:
Accounts payable and other accrued liabilities	$	4.2		$	6.4
Payables to customers	0.7			—
Payables to lenders under loans	48.0			—
Financial instruments sold, not yet purchased, at fair value	25.3			58.7
Total liabilities	78.2			65.1

Equity:
INTL FCStone Inc. (Parent Company Only) stockholders’ equity:
Preferred stock, $.01 par value. Authorized 1,000,000 shares; no shares issued or outstanding	—			—
Common stock, $.01 par value. Authorized 30,000,000 shares; 19,214,219 issued and 18,984,951 outstanding at September 30, 2012 and 18,653,964 issued and 18,642,407 outstanding at September 30, 2011	0.2			0.2
Common stock in treasury, at cost - 229,064 shares at September 30, 2012 and 11,557 shares at September 30, 2011	(4.1		)	(0.1		)
Additional paid-in capital	213.2			205.0
Retained earnings⁽¹⁾	0.4			15.4
Total INTL FCStone Inc. (Parent Company Only) stockholders’ equity	209.7			220.5
Total liabilities and equity	$	287.9		$	285.6

⁽¹⁾ Within the Condensed Balance Sheets and Condensed Statements of Operations of INTL FCStone Inc. - Parent Company Only, the Company has accounted for its investment in wholly owned subsidiaries using the cost method of accounting. Under this method, the Company's share of the earnings or losses of such subsidiaries are not included in the Condensed Balance Sheet or Condensed Statements of Operations. If the accounting for its investment in wholly owned subsidiaries were presented under the equity method of accounting, investment in subsidiaries and retained earnings would each increase by $111.6 million as of September 30, 2012, respectively, and $81.8 million as of September 30, 2011, respectively.

Schedule I

INTL FCStone Inc.

Condensed Statements of Operations

Parent Company Only



	Year Ended September 30,
(in millions)	2012			2011			2010
Revenues:
Trading gains, net	$	7.1		$	3.1		$	2.5
Commission and clearing fees	—			—			0.9
Interest income	2.1			4.3			1.7
Other income⁽²⁾	0.3			0.4			13.9
Total revenues	9.5			7.8			19.0
Interest expense	5.6			9.7			6.3
Net revenues	3.9			(1.9		)	12.7
Non-interest expenses:
Compensation and benefits	12.4			8.6			10.2
Clearing and related expenses	0.3			0.1			0.1
Introducing broker commissions	—			0.2			0.2
Communication and data services	0.6			0.5			0.5
Occupancy and equipment rental	1.0			1.2			0.8
Professional fees	3.1			3.8			1.3
Depreciation and amortization	1.2			0.6			—
Bad debts and impairments	2.2			—			(1.1		)
Other	6.8			(0.5		)	3.1
Total non-interest expenses	27.6			14.5			15.1
Loss from continuing operations, before tax	(23.7		)	(16.4		)	(2.4		)
Income tax benefit	9.2			6.4			5.7
Net (loss) income	$	(14.5	)	$	(10.0	)	$	3.3

⁽²⁾ Within the Condensed Balance Sheets and Condensed Statements of Operations of INTL FCStone Inc. - Parent Company Only, the Company has accounted for its investment in wholly owned subsidiaries using the cost method of accounting. Under this method, the Company's share of the earnings or losses of such subsidiaries are not included in the Condensed Balance Sheet or Condensed Statements of Operations. If the accounting for its investment in wholly owned subsidiaries were presented under the equity method of accounting, revenues would include income from investment in subsidiaries of $29.5 million, $47.3 million and $2.1 million, for the years ended September 30, 2012, 2011 and 2010, respectively.

Schedule I

INTL FCStone Inc.

Condensed Statements of Cash Flows

Parent Company Only



	Year Ended September 30,
(in millions)	2012			2011			2010
Cash flows from operating activities:
Net (loss) income	$	(14.5	)	$	(10.0	)	$	3.3
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	1.2			0.6			—
Provision for impairments	2.2			—			—
Deferred income taxes	(0.1		)	1.1			(1.6		)
Amortization of debt issuance costs and debt discount	0.5			0.2			0.2
Convertible debt interest settled in common stock upon conversion	—			0.2			—
Amortization of stock-based compensation expense	5.9			2.3			1.9
Gain on acquisition of INTL Provident	—			(0.4		)	—
Impairment of INTL Sieramet, LLC	—			—			(1.1		)
Changes in operating assets and liabilities:
Receivables from subsidiaries	21.7			35.7			(6.5		)
Notes receivable, net	(10.2		)	—			—
Income taxes receivable	7.1			(13.6		)	(0.5		)
Financial instruments owned, at fair value	1.7			(0.4		)	(2.8		)
Other assets	(0.3		)	(0.8		)	(0.3		)
Accounts payable and other accrued liabilities	(2.2		)	1.7			(1.3		)
Payables to customers	0.7			—			—
Financial instruments sold, not yet purchased, at fair value	(33.4		)	(0.5		)	37.1
Net cash provided by operating activities	(19.7		)	16.1			28.4
Cash flows from investing activities:
Cash paid for acquisitions, net	—			—			(5.0		)
Capital contribution in affiliates	(12.5		)	(1.0		)	(0.7		)
Purchase of property and equipment	(2.7		)	(1.7		)	—
Net cash used in investing activities	(15.2		)	(2.7		)	(5.7		)
Cash flows from financing activities:
Payable to lenders under loans and overdrafts	48.0			(11.9		)	(23.0		)
Share repurchase	(4.0		)	—			—
Debt issuance costs	(0.1		)	(1.2		)	—
Exercise of stock options	1.9			1.3			0.7
Income tax benefit on stock options and awards	0.2			—			—
Net cash provided by (used in) financing activities	46.0			(11.8		)	(22.3		)
Net increase in cash and cash equivalents	11.1			1.6			0.4
Cash and cash equivalents at beginning of period	2.0			0.4			—
Cash and cash equivalents at end of period	$	13.1		$	2.0		$	0.4
Supplemental disclosure of cash flow information:
Cash paid for interest	$	2.1		$	3.0		$	3.8
Income taxes paid (received), net of cash refunds	$	0.1		$	10.8		$	(1.7	)
Supplemental disclosure of non-cash investing and financing activities:
Conversion of subordinated notes to common stock, net	$	—		$	16.7		$	—

- Definition

The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document.

+ References + Details

Basis of Presentation and Consolidation (Policies)	12 Months Ended
Basis of Presentation and Consolidation (Policies)	Sep. 30, 2012
Basis of Presentation and Consolidation [Abstract]
Basis of Accounting, Policy [Policy Text Block]	The accompanying consolidated financial statements include the accounts of INTL FCStone Inc. and all other entities in which the Company has a controlling financial interest. All material intercompany transactions and balances have been eliminated in consolidation. Unless otherwise stated herein, all references to 2012, 2011, and 2010 refer to the Company’s fiscal years ended September 30.
Use of Estimates, Policy [Policy Text Block]	The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. The most significant of these estimates and assumptions relate to fair value measurements for financial instruments and investments, revenue recognition, the provision for potential losses from bad debts, valuation of inventories, valuation of goodwill and intangible assets, incomes taxes and contingencies. These estimates are based on management's best knowledge of current events and actions the Company may undertake in the future. The Company reviews all significant estimates affecting the financial statements on a recurring basis and records the effect of any necessary adjustments prior to their issuance. Although these and other estimates and assumptions are based on the best available information, actual results could be materially different from these estimates.
New Accounting Pronouncements, Policy [Policy Text Block]	In January 2010, new guidance was issued to require new disclosures and clarify existing disclosure requirements about fair value measurements as set forth in the Fair Value Measurements and Disclosures Topic in the ASC. The guidance requires that a reporting entity should disclose separately the amounts of transfers in and out of Level 1 and Level 2 fair value measurements and describe the reasons for the transfers; and in the reconciliation for fair value measurements using significant unobservable inputs, a reporting entity should present separately information about purchases, sales, issuances, and settlements. In addition, the guidance clarifies that for purposes of reporting fair value measurement for each class of assets and liabilities, a reporting entity needs to use judgment in determining the appropriate classes of assets and liabilities; and a reporting entity should provide disclosures about the valuation techniques and inputs used to measure fair value for both recurring and nonrecurring fair value measurements. This guidance was effective for the Company as of the first interim period beginning after December 15, 2009, except for the detailed level 3 roll forward disclosure, which is effective for fiscal years beginning after December 15, 2010. The Company adopted the requirements of the disclosures during the quarter ended March 31, 2010, except for the detailed level 3 roll forward disclosures. The Company adopted the detailed level 3 roll forward disclosures beginning with the first quarter ended December 31, 2011. The adoption of this guidance did not have a material impact on the Company's disclosures in its consolidated financial statements. In May 2011, the Financial Accounting Standards Board ("FASB") issued an update to the fair value measurement guidance to achieve common fair value measurement and disclosure requirements in U.S. GAAP and International Financial Reporting Standards ("IFRS"). The amendments in the update change the wording used to describe many of the requirements in U.S. GAAP for measuring fair value and for disclosing information about fair value measurements. The amendment is not intended to result in a change in the application of the requirements in the Fair Value Measurements Topic in the ASC. This guidance is effective for interim and annual periods beginning after December 15, 2011. The Company adopted this guidance in the second quarter of fiscal year 2012. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. In June 2011, the FASB issued new guidance on the presentation of comprehensive income. This guidance eliminates the current option to report comprehensive income and its components in the statement of changes in equity. Under this guidance, an entity can elect to present items of net income and comprehensive income in one continuous statement or in two separate, but consecutive, statements. In addition, the guidance requires entities to show the effects of items reclassified from accumulated other comprehensive loss to net income on the face of the financial statements. This guidance is effective for fiscal years beginning after December 15, 2011 and interim and annual periods thereafter. Early adoption is permitted, but full retrospective application is required. This guidance is effective for the Company's fiscal year beginning October 1, 2012 and all interim periods within that fiscal year. In December 2011, the FASB issued guidance that deferred the portion of the original guidance that required a company to separately present within net income reclassification adjustments of items out of accumulated other comprehensive loss. The deferral is intended to be temporary until the FASB has time to reconsider these changes. The other provisions of the guidance will become effective as originally planned by the FASB. The Company is expecting to adopt this guidance in the first quarter of fiscal year 2013. As the Company reports comprehensive income within its consolidated statements of stockholders' equity, the adoption of this guidance will result in a change in the presentation of comprehensive income in the Company's consolidated financial statements. In September 2011, the FASB issued amended guidance on goodwill impairment testing. Under the revised guidance, entities testing goodwill for impairment have the option of performing a qualitative assessment, whether it is more likely than not (a likelihood of more than 50%) that the fair value of a reporting unit is less than its carrying amount, before calculating the fair value of the reporting unit. Because the qualitative assessment is optional, entities may bypass it for any reporting unit in any period and begin their impairment analysis with the quantitative calculation in step 1. The guidance does not change how goodwill is calculated or assigned to reporting units, nor does it revise the requirement to test goodwill annually for impairment. In addition, the guidance does not amend the requirement to test goodwill for impairment between annual tests if events or circumstances warrant, however, it does revise the examples of events and circumstances that an entity should consider. The amended guidance is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted. The Company adopted this guidance at the beginning of fiscal year 2012.The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. On December 16, 2011, the FASB issued new guidance on the disclosures about offsetting assets and liabilities. While the FASB retained the existing offsetting models under U.S. GAAP, the new standard requires disclosures to allow investors to better compare and understand significant quantitative differences in financial statements prepared under U.S. GAAP. The new standard is effective for annual periods beginning after January 1, 2013, and interim periods within those annual periods. Retrospective application is required. This guidance is effective for the Company's fiscal year beginning October 1, 2013. The Company is expecting to adopt this guidance starting with the first quarter of fiscal year 2014. The adoption of this guidance is expected to change some of the Company's disclosures within the notes to the consolidated financial statements. In July 2012, the FASB issued final guidance on indefinite-lived intangible assets impairment testing. Under the guidance, entities testing indefinite-lived intangibles for impairment have the option of first performing a qualitative assessment to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired. If a company determines that it is more likely than not that the fair value of such an asset exceeds its carrying amount, it would not need to calculate the fair value of the asset in that year. However, if a company concludes otherwise, it must calculate the fair value of the asset, compare that value with its carrying amount and record an impairment charge, if any. The guidance does not revise the requirement to test indefinite-lived intangible assets annually for impairment. In addition, the guidance does not amend the requirement to test indefinite-lived intangible assets for impairment between annual tests if events or circumstances warrant, however, it does revise the examples of events and circumstances that an entity should consider. The guidance is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption is permitted. The Company is expecting to adopt this guidance for the impairment testing to be performed during the fiscal year ended September 30, 2013. It is expected that the adoption of this guidance will not have a material impact on the Company's consolidated financial statements.

Description of Business and Significant Accounting Policies Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2012
Accounting Policies [Abstract]
Shares Subject to Mandatory Redemption, Changes in Redemption Value, Policy [Policy Text Block]	The Company had $16.7 million in aggregate principal amount of the Company’s senior subordinated convertible notes due September 2011 (the "Notes") outstanding as of September 30, 2010. The Notes were general unsecured obligations of the Company and bore interest at the rate of 7.625% per annum, payable quarterly in arrears. During the fiscal year ended September 30, 2011, the Notes were converted along with accrued interest of $0.2 million into 778,703 shares of common stock of the Company.
Finance, Loans and Leases Receivable, Policy [Policy Text Block]	The Company originates short-term notes receivable from customers with the outstanding balances being insured 90% to 98% by a third party, including accrued interest. The Company may sell the insured portion of the notes through non-recourse participation agreements with other third parties. See discussion of notes receivable related to commodity repurchase agreements below. Accrual of commodity financing income on any note is discontinued when, in the opinion of management, there is reasonable doubt as to the timely collectability of interest or principal. Nonaccrual notes are returned to an accrual status when, in the opinion of management, the financial position of the borrower indicates there is no longer any reasonable doubt as to the timely payment of principal and interest. The Company records a charge against earnings for notes receivable losses when management believes that collectability of the principal is unlikely.
Inventory, Policy [Policy Text Block]	Physical commodities inventories are stated at the lower of cost or market ("LCM"), using the weighted-average price and first-in first-out costing method. Cost includes finished commodity or raw material and processing costs related to the purchase and processing of inventories.
Property, Plant and Equipment, Policy [Policy Text Block]	Property and equipment is stated at cost, net of accumulated depreciation and amortization and depreciated using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized on a straight-line basis over the estimated useful life of the improvement or the term of the lease, whichever is shorter. Certain costs of software developed or obtained for internal use are capitalized and amortized over the estimated useful life of the software. Expenditures for maintenance, repairs, and minor replacements are charged against earnings, as incurred. Expenditures that increase the value or productive capacity of assets are capitalized. When property and equipment are retired, sold, or otherwise disposed of, the asset's carrying amount and related accumulated depreciation are removed from the accounts and any gain or loss is included in earnings.
Goodwill and Intangible Assets, Policy [Policy Text Block]	Goodwill is the cost of acquired companies in excess of the fair value of identifiable net assets at acquisition date. In accordance with the Intangibles – Goodwill and Other Topic of the ASC, goodwill is tested for impairment on an annual basis at the fiscal year-end, and between annual tests if indicators of potential impairment exist, using a fair-value-based approach. No impairment of goodwill has been identified during any of the periods presented. Identifiable intangible assets subject to amortization are amortized using the straight-line method over their estimated period of benefit, ranging from two to twenty years. Identifiable intangible assets are tested for impairment whenever events or changes in circumstances suggest that an asset’s or asset group’s carrying value may not be fully recoverable in accordance with the Intangibles – Goodwill and Other Topic of the ASC. Residual value is presumed to be zero. Identifiable intangible assets not subject to amortization are reviewed at each reporting period to reevaluate if the intangible asset’s useful life remains indefinite. Additionally, intangible assets not subject to amortization are tested annually for impairment at the fiscal year-end, and between annual tests if indicators of potential impairment exist, using a fair-value-based approach. See Note 9 for discussion of impairments of intangible assets that have been identified during the fiscal year ended September 30, 2012.
Investment, Policy [Policy Text Block]	Financial instruments owned and sold, not yet purchased, at fair value consist of financial instruments carried at fair value or amounts that approximate fair value, with related unrealized changes in gains or losses recognized in earnings, except for securities classified as available-for-sale. The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties, other than in a forced or liquidation sale. The Company accounts for its securities pledged on behalf of customers and proprietary securities in accordance with the Investments - Debt and Equity Securities Topic in the ASC. In accordance with this guidance, the Company determines the appropriate classification of its investments as trading, available-for-sale, or held-to-maturity at the time of purchase and reevaluates the designation as of each reporting period. The Company has classified certain U.S. government obligations, corporate debt securities and exchange firm common stock not pledged for clearing purposes as available-for-sale, which are carried at fair value based on observable or quoted market prices and associated unrealized gains or losses are recorded as a component of OCI, net of tax, until realized, unless an unrealized loss is determined to be other than temporary, in which case such loss is charged to earnings. The Company classifies those securities as available-for-sale because it would consider selling them prior to maturity to meet liquidity needs or as part of the Company’s risk management program. The Company computes the cost of its securities on a specific identification basis. Such cost includes the direct costs to acquire securities, adjusted for the amortization of any discount or premium. The amortized cost of securities is computed under the effective-interest method and is included in interest income. Realized gains and losses, declines in value judged to be other than temporary and interest on available-for-sale securities are included in earnings. Investment in managed funds, at fair value represents investments in funds managed by the Company’s fund managers. The investments are valued at period-end at the net asset value provided by the fund’s administrator. Commodities warehouse receipts are valued at the cash price for the commodity based on published market quotes. For commodities warehouse receipts, the change in fair value is offset against the payable to customers with no impact on the consolidated income statements. The Company utilizes derivative instruments to manage exposures to foreign currency, commodity price and interest rate risks for the Company and its customers. The Company’s objectives for holding derivatives include reducing, eliminating, and efficiently managing the economic impact of these exposures as effectively as possible. Derivative instruments are recognized as either assets or liabilities and are measured at fair value. The accounting for changes in the fair value of a derivative depends on the intended use of the derivative and the resulting designation. For a derivative instrument designated as a cash flow hedge, the effective portion of the derivative’s gain or loss is initially recorded in OCI, net of tax, and is subsequently recognized in earnings when the hedged exposure affects earnings. The ineffective portion of the gain or loss is recognized in earnings. Gains and losses from changes in fair values of derivatives that are not designated as cash flow hedges for accounting purposes are recognized in earnings. The Company’s derivative contracts consist of exchange-traded and OTC derivatives. Fair values of exchange-traded derivatives are generally determined from quoted market prices. OTC derivatives are valued using valuation models. The valuation models used to derive the fair values of OTC derivatives require inputs including contractual terms, market prices, yield curves and measurements of volatility. The Company uses similar models to value similar instruments. Where possible, the Company verifies the values produced by pricing models by comparing them to market transactions. Inputs may involve judgment where market prices are not readily available. The Company does not elect hedge accounting under the Derivatives and Hedging Topic of the ASC in accounting for derivatives used as economic hedges on its commodities. The Company provides clearing and execution of exchange-traded futures and options-on-futures for middle-market intermediaries, end-users, producers of commodities and the institutional and professional trader market segments. The Company has a subsidiary that is a registered futures commission merchant ("FCM"), clearing on various exchanges. The primary sources of revenues for the Company's FCM are commissions and clearing fees derived from executing and clearing orders for commodity futures contracts and options-on-futures on behalf of its customers. The Company also brokers foreign exchange forwards, options and cash, or spot, transactions between customers and external counterparties. A portion of the contracts are arranged on an offsetting basis, limiting the Company's risk to performance of the two offsetting parties. The offsetting nature of the contracts eliminates the effects of market fluctuations on the Company's operating results. Due to the Company's role as a principal participating in both sides of these contracts, the amounts are presented gross on the consolidated balance sheets at their respective fair values, net of offsetting assets and liabilities. In addition, the Company engages in speculative trading and holds proprietary positions in futures, options, swaps and forward derivatives, including corn, wheat, soybeans, sugar and foreign currency contracts. Since some of the derivatives held or sold by the Company are for speculative trading purposes, these derivative instruments are not designated as hedging instruments and accordingly, the changes in fair value during the period are recorded in the consolidated income statements as a component of 'trading gains, net' (see Note 4). The Company also holds proprietary positions in its foreign exchange line of business. On a limited basis, the Company's foreign exchange trade desk will accept a customer transaction and will offset that transaction with a similar but not identical position with a counterparty. These unmatched transactions are intended to be short-term in nature and are often conducted to facilitate the most effective transaction for the Company's customer. These spot and forward contracts are accounted for as free-standing derivatives and reported in the consolidated balance sheets at their fair values. The Company does not seek hedge accounting treatment for these derivatives, and accordingly, the changes in fair value during the period are recorded in the consolidated income statements within 'trading gains, net' (see Note 4). In applying the guidance in the Balance Sheet-Offsetting Topic of the ASC, the Company's accounting policy is such that open contracts with the same customer are netted at the account level, in accordance with netting arrangements in place with each party, as applicable and rights to reclaim cash collateral or obligations to return cash collateral are netted against fair value amounts recognized for derivative instruments with the same customer in accordance with the master netting arrangements in place with each customer. The Company may lease commodities to or from customers or counterparties, or advance commodities to customers on an unpriced basis, receiving payment when they become priced. These are valued at fair value utilizing the fair value option based on guidance within the Financial Instruments Topic of the ASC. The Company uses the fair value option to value these financial instruments since they are hybrid contracts with embedded derivative features that cannot be reliably measured and separated from the host contract. As permitted by the fair value option election, the entire instrument is recorded at fair value within the consolidated balance sheets as a component of 'financial instruments owned and sold, not yet purchased'. Due to the short term nature of the instruments, the balance of the agreements is not materially different than the recorded fair value. The corresponding change in fair value of the instrument is recognized within the consolidated income statements as a component of 'trading gains, net' for the fiscal years ended 2012, 2011 and 2010. The Company does elect to value all of their commodities lease agreements at fair value using the fair value option. See fair value measurements in Note 3.
Trade and Other Accounts Receivable, Policy [Policy Text Block]	Receivables from customers, net of the allowance for doubtful accounts, include the total of net deficits in individual exchange-traded and OTC trading accounts carried by the Company. Customer deficits arise from realized and unrealized trading losses on futures, options-on-futures, swaps and forwards and amounts due on cash and margin transactions. Customer deficit accounts are reported gross of customer accounts that contain net credit or positive balances, except where a right of offset exists. Net deficits in individual exchange-traded and OTC trading accounts include both secured and unsecured deficit balances due from customers as of the balance sheet date. Secured deficit amounts are backed by U.S. Treasury bills and notes with a fair value of $0.8 million and $0.4 million as of September 30, 2012 and 2011, respectively, and commodity warehouse receipts with a fair value of $7.5 million and $16.2 million as of September 30, 2012 and 2011, respectively. These U.S Treasury bills and notes and commodity warehouse receipts are not netted against the secured deficit amounts, as the conditions for right of setoff have not been met. Payables to customers represent the total of customer accounts with credit or positive balances. Customer accounts are used primarily in connection with commodity transactions and include gains and losses on open commodity trades as well as securities and other deposits made as required by the Company or the exchange-clearing organizations or counterparties. Customer accounts with credit or positive balances are reported gross of customer deficit accounts, except where a right of offset exists. For regulatory purposes, certain customers, which would include persons who are affiliated with the Company or are principals, such as an officer or director, and any person who is materially involved in the management of the Company, are identified as noncustomers. A noncustomer account may not be carried as a customer account due to an affiliation with the Company. In a liquidation event, amounts owed to noncustomers are paid in the same priority as amounts owed to general creditors of the Company. These accounts are also referred to as proprietary accounts. The amounts related to noncustomer accounts are included in 'payables to customers' on the consolidated balance sheets. The future collectability of the receivables from customers can be impacted by the Company’s collection efforts, the financial stability of its customers, and the general economic climate in which it operates. The Company evaluates accounts that it believes may become uncollectible on a specific identification basis, through reviewing daily margin deficit reports, the historical daily aging of the receivables, and by monitoring the financial strength of its customers. The Company may unilaterally close customer trading positions in certain circumstances. In addition, to evaluate customer margining and collateral requirements, customer positions are stress tested regularly and monitored for excessive concentration levels relative to the overall market size. The Company generally charges off an outstanding receivable balance when all economically sensible means of recovery have been exhausted. That determination considers information such as the occurrence of significant changes in the customer's financial position such that the customer can no longer pay the obligation, or that the proceeds from collateral will not be sufficient to pay the balance.
Repurchase and Resale Agreements Policy [Policy Text Block]	In the normal course of operations the Company accepts notes receivable under sale/repurchase agreements with customers whereby the customers sell certain commodity inventory or other investments and agree to repurchase the commodity inventory or investment at a future date at either a fixed or floating rate. These transactions are short-term in nature, and in accordance with the guidance contained in the Transfers and Servicing Topic of the ASC, are treated as secured borrowings rather than commodity inventory and purchases and sales in the Company’s consolidated financial statements. Additionally, the Company participates in transactions involving commodities or other investments sold under repurchase agreements (“repos”). In accordance with the guidance contained in the Transfers and Servicing Topic of the ASC, these transactions are treated as secured borrowings that are recorded as a liability in the consolidated balance sheets. Commodities or investments sold under repurchase agreements are reflected at the amount of cash received in connection with the transactions. The Company may be required to provide additional collateral based on the fair value of the underlying asset. The Company has an overnight sweep reverse repurchase agreement program to allow the Company to enter into secured overnight investments (reverse repurchase agreements or reverse repos), which generally provides a higher investment yield than a regular operating account. The reverse repurchase agreements are recorded at amounts at which the securities were initially acquired. It is the policy of the Company to take possession of the securities purchased under agreements to resell. The Company receives U.S. Treasury securities as collateral for the overnight agreements. The securities received are recorded at no more than the lesser of the current fair value of the securities or the net amount to be realized by the Company upon resale of the securities. The maturity of the reverse repurchase agreements is typically one day, at which point the securities are sold and the proceeds are returned to the Company, plus any accrued interest. There were no agreements to resell securities as of September 30, 2012 and 2011.
Business Combinations Policy [Policy Text Block]	Acquisitions during fiscal 2012 and 2011 are accounted for as business combinations in accordance with the provisions of the Business Combinations Topic of the ASC. Under this accounting guidance most of the assets and liabilities acquired and assumed are measured at fair value as of the acquisition date. Certain contingent liabilities acquired require remeasurement at fair value in each subsequent reporting period. Noncontrolling interests are initially measured at fair value and classified as a separate component of equity. Acquisition related costs, such as fees for attorneys, accountants, and investment bankers, are expensed as incurred and are not capitalized as part of the purchase price. For all acquisitions, regardless of the consummation date, deferred tax assets, valuation allowances, and uncertain tax position adjustments occurring after the measurement period are recorded as a component of income, rather than adjusted through goodwill. Determining the fair value of certain assets and liabilities acquired is subjective in nature and often involves the use of significant estimates and assumptions. Estimating the fair value of the assets and liabilities acquired requires significant judgment.
Revenue Recognition, Policy [Policy Text Block]	Sales of physical commodities revenue are recognized when persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, and collectability is reasonably assured. The Company reports its physical commodities revenues on a gross basis, with the corresponding cost of sales shown separately, in accordance with the guidelines provided in the Revenue Recognition Topic of the ASC. Trading gains, net include brokerage fees and margins generated from OTC derivative trades executed with customers and other counterparties and are recognized when trades are executed. Trading gains, net also include activities where the Company acts as principal in the purchase and sale of individual securities, currencies, commodities or derivative instruments with customers. These transactions may be offset simultaneously with another customer or counterparty, offset with similar but not identical positions on an exchange, made from inventory, or may be aggregated with other purchases to provide liquidity intraday, for a number of days, or in some cases, particularly the base metals business, even longer periods (during which fair value may fluctuate). In addition, trading gains, net includes activities from the Company's operations of a proprietary foreign exchange desk which arbitrages the futures and cash markets (see additional discussion in the Financial Instruments and Derivatives policy note for revenue recognition on proprietary trading activities). Net dealer inventory and investment gains are recognized on a trade-date basis and include realized gains or losses and changes in unrealized gains or losses on investments at fair value. Dividend income and dividend expense, on short equity positions, are recognized net, within 'trading gain, net' on the ex-dividend date. Commissions on futures contracts are recognized on a half-turn basis in two equal parts. The first half is recognized when the contract is opened and the second half is recognized when the transaction is closed. Commissions on options-on-futures contracts are generally recognized on a half-turn basis, except that full commissions are recognized on options expected to expire without being exercised or offset. Commissions and fees are charged at various rates based on the type of account, the products traded, and the method of trade. Clearing and transaction fees are charged to customers on a per exchange contract basis based on the trade date. Such fees are for clearing customers’ exchange trades and include fees charged to the Company by the various futures exchanges. See discussion of clearing and related expenses below. Consulting and management fees include risk management consulting fees which are billed and recognized as revenue on a monthly basis when risk management services are provided. Such agreements are generally for one year periods, but are cancelable by either party upon providing thirty days written notice to the other party and the amounts are not variable based on customer trading activities. Asset management fees are recognized as they are earned based on fees due at each period-end date. These include performance fees based on the amount that is due under the formula for exceeding performance targets as of the period-end date. Fee income for structuring and arrangement of debt transactions and management and investment advisory income is recorded when the services related to the underlying transactions are provided and success fees are recorded when complete, as determined under the terms of the assignment or engagement. Interest income, generated primarily from investments and customer inventory financing, is recognized on an accrual basis. Interest from investments is generated from securities purchased using customer funds deposited with the Company to satisfy margin requirements, net of interest returned to customers, and from securities acquired through internally-generated company funds. Interest also includes unrealized gains and losses on securities owned and those deposited with other parties. Revenue generally is recognized net of any taxes collected from customers and subsequently remitted to governmental authorities.
Cost of Sales, Policy [Policy Text Block]	Cost of sales of physical commodities include finished commodity or raw material and processing costs along with operating costs relating to the receipt, storage and delivery of the physical commodities.
Compensation Related Costs, Policy [Policy Text Block]	Compensation and benefits consists primarily of salaries, incentive compensation, commissions, related payroll taxes and employee benefits. The Company classifies employees as either traders / risk management consultants, operational or administrative personnel, which includes the executive officers. The most significant component of the Company’s compensation expense is the employment of the traders / risk management consultants, who are paid commissions based on the revenues that their customer portfolios generate. The Company accrues commission expense on a trade date basis.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	The Company accounts for share-based compensation in accordance with the guidance of the Compensation-Stock Compensation Topic of the ASC. The cost of employee services received in exchange for a share-based award is generally measured based on the grant-date fair value of the award. Share-based employee awards that require future service are amortized over the relevant service period. Expected forfeitures are included in determining share-based employee compensation expense. In the first quarter of 2006, the Company adopted the guidance under the Compensation-Stock Compensation Topic of the ASC using the modified prospective method. For option awards granted subsequent to the adoption, compensation cost is recognized on a straight-line basis over the vesting period for the entire award. The expense of unvested option awards granted prior to the adoption are recognized on a straight-line basis, over the balance of the vesting period.
Exchange Memberships, Policy [Policy Text Block]	The Company is required to hold certain exchange membership seats and exchange firm common stock and pledge them for clearing purposes, in order to provide the Company the right to process trades directly with the various exchanges. Exchange memberships include seats on the Chicago Board of Trade ("CBOT"), the Board of Trade of Kansas City, Missouri, Inc. ("KCBT"), the Minnesota Grain Exchange, the New York Mercantile Exchange ("NYMEX"), the COMEX Division of the New York Mercantile Exchange, Mercado de Valores de Buenos Aires S.A. ("MERVAL"), the Chicago Mercantile Exchange ("CME") Growth and Emerging Markets, InterContinental Exchange, Inc. ("ICE") Futures US, ICE Europe Ltd and London Metal Exchange ("LME"). Exchange firm common stock include shares of CME Group, Inc., ICE and LME. In December 2012, the CME completed its acquisition of the KCBT. The Company expects to receive proceeds of $1.5 million and recognize a gain of $0.9 million before taxes, in connection with its class A shares of the KCBT held as of September 30, 2012, during the first quarter of fiscal year 2013. Exchange memberships and firm common stocks pledged for clearing purposes are recorded at cost, in accordance with U.S. GAAP and CFTC regulations and are included within 'other assets' on the consolidated balance sheets. Equity investments in exchange firm common stock not pledged for clearing purposes are classified as available-for-sale and recorded at fair value, with unrealized gains and losses recorded as a component of OCI, net of tax, until realized. Equity investments in exchange firm common stock not pledged for clearing purposes are included within 'financial instruments owned' on the consolidated balance sheets. The Company acquired shares of the LME during the year ended September 30, 2011 at a cost of $3.4 million. In January 2011, excess shares of exchange firm common stock, with a cost basis of $1.2 million, were sold, resulting in a nominal gain. In July 2011, the CME Group removed the requirement of its member firms to hold a specified quantity of its exchange firm common stock in order to process trades directly with the exchange. Since the shares of CME Group common stock are no longer pledged for clearing purposes, during the fiscal year ended September 30, 2011, the Company designated the shares as available-for-sale and recorded them at fair value within 'financial instruments owned' in the consolidated balance sheets. See Note 3 for additional discussion of equity investments in exchange firm common stock not pledged for clearing purposes. The cost basis for exchange memberships and firm common stock pledged for clearing purposes was $10.5 million and $10.3 million as of September 30, 2012 and 2011, respectively. The fair value of exchange memberships and firm common stock pledged for clearing purposes was $8.9 million and $10.5 million as of September 30, 2012 and 2011, respectively. The fair value of exchange firm common stock is determined by quoted market prices, and the fair value of exchange memberships is determined by recent sale transactions. The Company monitors the fair value of exchange membership seats and firm common stock on a quarterly basis, and does not consider any current unrealized losses on individual exchange memberships to be anything other than a temporary impairment.
Preferred Stock [Text Block]	The Company is authorized to issue one million shares of preferred stock, par value of $0.01 per share, in one or more classes or series to be established by the Company's board of directors. As of September 30, 2012 and 2011, no preferred shares were outstanding and the Company's board of directors had not yet established any class or series of shares.
New Accounting Pronouncements, Policy [Policy Text Block]	In January 2010, new guidance was issued to require new disclosures and clarify existing disclosure requirements about fair value measurements as set forth in the Fair Value Measurements and Disclosures Topic in the ASC. The guidance requires that a reporting entity should disclose separately the amounts of transfers in and out of Level 1 and Level 2 fair value measurements and describe the reasons for the transfers; and in the reconciliation for fair value measurements using significant unobservable inputs, a reporting entity should present separately information about purchases, sales, issuances, and settlements. In addition, the guidance clarifies that for purposes of reporting fair value measurement for each class of assets and liabilities, a reporting entity needs to use judgment in determining the appropriate classes of assets and liabilities; and a reporting entity should provide disclosures about the valuation techniques and inputs used to measure fair value for both recurring and nonrecurring fair value measurements. This guidance was effective for the Company as of the first interim period beginning after December 15, 2009, except for the detailed level 3 roll forward disclosure, which is effective for fiscal years beginning after December 15, 2010. The Company adopted the requirements of the disclosures during the quarter ended March 31, 2010, except for the detailed level 3 roll forward disclosures. The Company adopted the detailed level 3 roll forward disclosures beginning with the first quarter ended December 31, 2011. The adoption of this guidance did not have a material impact on the Company's disclosures in its consolidated financial statements. In May 2011, the Financial Accounting Standards Board ("FASB") issued an update to the fair value measurement guidance to achieve common fair value measurement and disclosure requirements in U.S. GAAP and International Financial Reporting Standards ("IFRS"). The amendments in the update change the wording used to describe many of the requirements in U.S. GAAP for measuring fair value and for disclosing information about fair value measurements. The amendment is not intended to result in a change in the application of the requirements in the Fair Value Measurements Topic in the ASC. This guidance is effective for interim and annual periods beginning after December 15, 2011. The Company adopted this guidance in the second quarter of fiscal year 2012. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. In June 2011, the FASB issued new guidance on the presentation of comprehensive income. This guidance eliminates the current option to report comprehensive income and its components in the statement of changes in equity. Under this guidance, an entity can elect to present items of net income and comprehensive income in one continuous statement or in two separate, but consecutive, statements. In addition, the guidance requires entities to show the effects of items reclassified from accumulated other comprehensive loss to net income on the face of the financial statements. This guidance is effective for fiscal years beginning after December 15, 2011 and interim and annual periods thereafter. Early adoption is permitted, but full retrospective application is required. This guidance is effective for the Company's fiscal year beginning October 1, 2012 and all interim periods within that fiscal year. In December 2011, the FASB issued guidance that deferred the portion of the original guidance that required a company to separately present within net income reclassification adjustments of items out of accumulated other comprehensive loss. The deferral is intended to be temporary until the FASB has time to reconsider these changes. The other provisions of the guidance will become effective as originally planned by the FASB. The Company is expecting to adopt this guidance in the first quarter of fiscal year 2013. As the Company reports comprehensive income within its consolidated statements of stockholders' equity, the adoption of this guidance will result in a change in the presentation of comprehensive income in the Company's consolidated financial statements. In September 2011, the FASB issued amended guidance on goodwill impairment testing. Under the revised guidance, entities testing goodwill for impairment have the option of performing a qualitative assessment, whether it is more likely than not (a likelihood of more than 50%) that the fair value of a reporting unit is less than its carrying amount, before calculating the fair value of the reporting unit. Because the qualitative assessment is optional, entities may bypass it for any reporting unit in any period and begin their impairment analysis with the quantitative calculation in step 1. The guidance does not change how goodwill is calculated or assigned to reporting units, nor does it revise the requirement to test goodwill annually for impairment. In addition, the guidance does not amend the requirement to test goodwill for impairment between annual tests if events or circumstances warrant, however, it does revise the examples of events and circumstances that an entity should consider. The amended guidance is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted. The Company adopted this guidance at the beginning of fiscal year 2012.The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. On December 16, 2011, the FASB issued new guidance on the disclosures about offsetting assets and liabilities. While the FASB retained the existing offsetting models under U.S. GAAP, the new standard requires disclosures to allow investors to better compare and understand significant quantitative differences in financial statements prepared under U.S. GAAP. The new standard is effective for annual periods beginning after January 1, 2013, and interim periods within those annual periods. Retrospective application is required. This guidance is effective for the Company's fiscal year beginning October 1, 2013. The Company is expecting to adopt this guidance starting with the first quarter of fiscal year 2014. The adoption of this guidance is expected to change some of the Company's disclosures within the notes to the consolidated financial statements. In July 2012, the FASB issued final guidance on indefinite-lived intangible assets impairment testing. Under the guidance, entities testing indefinite-lived intangibles for impairment have the option of first performing a qualitative assessment to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired. If a company determines that it is more likely than not that the fair value of such an asset exceeds its carrying amount, it would not need to calculate the fair value of the asset in that year. However, if a company concludes otherwise, it must calculate the fair value of the asset, compare that value with its carrying amount and record an impairment charge, if any. The guidance does not revise the requirement to test indefinite-lived intangible assets annually for impairment. In addition, the guidance does not amend the requirement to test indefinite-lived intangible assets for impairment between annual tests if events or circumstances warrant, however, it does revise the examples of events and circumstances that an entity should consider. The guidance is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption is permitted. The Company is expecting to adopt this guidance for the impairment testing to be performed during the fiscal year ended September 30, 2013. It is expected that the adoption of this guidance will not have a material impact on the Company's consolidated financial statements.
Use of Estimates, Policy [Policy Text Block]	The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. The most significant of these estimates and assumptions relate to fair value measurements for financial instruments and investments, revenue recognition, the provision for potential losses from bad debts, valuation of inventories, valuation of goodwill and intangible assets, incomes taxes and contingencies. These estimates are based on management's best knowledge of current events and actions the Company may undertake in the future. The Company reviews all significant estimates affecting the financial statements on a recurring basis and records the effect of any necessary adjustments prior to their issuance. Although these and other estimates and assumptions are based on the best available information, actual results could be materially different from these estimates.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Assets and liabilities recorded in foreign currencies are translated at the exchange rates prevailing on the balance sheet date. Revenue and expenses are translated at average rates of exchange prevailing during the period. Gains or losses on translation of the financial statements of a non-United States (“U.S.”) operation, when the functional currency is other than the U.S. dollar, are recorded in other comprehensive income (“OCI”), net of tax, a component of stockholders' equity. Foreign currency remeasurement gains or losses on transactions in nonfunctional currencies are included within 'trading gains, net' in the consolidated income statements.
Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block]	The Company considers cash held at banks and all highly liquid investments, including certificates of deposit, which may be withdrawn at any time at the discretion of the Company without penalty, to be cash and cash equivalents. Cash and cash equivalents consist of cash, foreign currency, money market funds and certificates of deposit not deposited with or pledged to an exchange-clearing organization. The money market funds are valued at period-end at the net asset value provided by the fund’s administrator, which approximates fair value. Certificates of deposit are stated at cost plus accrued interest, which approximates fair value. All cash and cash equivalents that are deposited with brokers, dealers and clearing organizations support the Company’s trading activities, and are subject to contractual restrictions. The Company has an investment policy, which limits the maximum amount placed in any one fund and with any one institution in order to reduce credit risk. The Company does not believe that it is exposed to significant risk on cash and cash equivalents.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Pursuant to requirements of the Commodity Exchange Act in the U.S. and similarly in the United Kingdom ("UK"), pursuant to the Markets in Financial Instruments Implementing Directive 2006/73/EC underpinning the Client Asset or 'CASS' rules in the Financial Services Authority ("FSA") handbook, funds deposited by customers relating to futures and options-on-futures contracts in regulated commodities must be carried in separate accounts which are designated as segregated customer accounts. The deposits in segregated customer accounts are not commingled with the funds of the Company. Under the FSA's rules, certain categories of clients may choose to opt-out of segregation. As of September 30, 2012 and 2011, cash, securities and other assets segregated under federal and other regulations consisted of cash held at banks and money market funds of approximately $284.7 million and $96.7 million, respectively, U.S. government securities and federal agency obligations of approximately $50.5 million and $3.7 million, respectively, and commodities warehouse receipts of approximately $22.3 million and $19.0 million, respectively (see fair value measurements discussion in Note 3).
Due to and from Broker-Dealers and Clearing Organizations Disclosure [Text Block]	As required by the regulations of the U.S. Commodity Futures Trading Commission (“CFTC”) and the Markets in Financial Instruments Implementing Directive 2006/73/EC underpinning the CASS rules in the FSA handbook, customer funds received to margin, guarantee, and/or secure commodity futures transactions are segregated and accounted for separately from the general assets of the Company. Under the FSA's rules, certain categories of clients may choose to opt-out of segregation. Deposits with exchange-clearing organizations, broker-dealers and counterparties pertain primarily to deposits made to satisfy margin requirements on customer and proprietary open futures and options-on-futures positions and to satisfy the requirements set by clearing exchanges for clearing membership. The Company also pledges margin deposit with various counterparties for OTC derivative contracts, and these deposits are also included in deposits and receivables from broker-dealers and counterparties. Deposits with and receivables from exchange-clearing organizations and broker-dealers and counterparties are reported gross, except where a right of offset exists. As of September 30, 2012 and 2011, the Company had cash and cash equivalents on deposit with or pledged to exchange-clearing organizations, broker-dealers and counterparties of $0.4 billion and $1.2 billion, respectively. These balances also include securities pledged by the Company on behalf of customers and customer-owned securities that are pledged. It is the Company’s practice to include customer owned securities on its consolidated balance sheets, as the rights to those securities have been transferred to the Company under the terms of the futures trading agreement. Securities pledged include U.S. Treasury bills and instruments backed by U.S. government sponsored entities and government-sponsored enterprise backed mortgage-backed securities ("mortgage-backed securities"). The securities that are not customer-owned are adjusted to fair value with associated changes in unrealized gains or losses recorded in OCI, net of tax, until realized, a component of stockholders' equity. For customer owned securities, the change in fair value is offset against the payable to customers with no impact recognized on the consolidated income statements. The securities, primarily U.S. Government obligations and mortgage-backed securities, held by FCStone LLC ("FCStone"), a subsidiary of INTL, as collateral or as margin have been deposited with exchange-clearing organizations, broker-dealers or other counterparties. The fair value of these securities was approximately $1.3 billion and $0.5 billion as of September 30, 2012 and 2011, respectively. Management has considered guidance required by the Transfers and Servicing Topic of the ASC as it relates to securities pledged by customers to margin their accounts. Based on a review of the agreements with the customer, management believes a legal basis exists to support that the transferor surrenders control over those assets if all of the following three conditions are met: (a) the transferred assets have been isolated from the transferor—put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership, (b) each transferee has the right to pledge or exchange the assets (or beneficial interests) it received, and no condition both constrains the transferee (or holder) from taking advantage of its right to pledge or exchange and provides more than a trivial benefit to the transferor and (c) the transferor does not maintain effective control over the transferred assets through either (1) an agreement that both entitles and obligates the transferor to repurchase or redeem them before their maturity or (2) the ability to unilaterally cause the holder to return specific assets, other than through a cleanup call. Under this guidance, the Company reflects the customer collateral assets and corresponding liabilities in the Company’s consolidated balance sheets as of September 30, 2012 and 2011. In addition to margin, deposits with exchange-clearing organizations include guaranty deposits. The guaranty deposits are held by the clearing organization for use in potential default situations by one or more members of the clearing organization. The guaranty deposits may be applied to the Company’s obligations to the clearing organization, or to the clearing organization’s obligations to other clearing members or third parties. The Company maintains customer omnibus and proprietary accounts with other counterparties, and the equity balances in those accounts along with any margin cash or securities deposited with the carrying broker are included in deposits and receivables from broker-dealers and counterparties. Receivables from and payables to exchange-clearing organizations are also comprised of amounts due from or due to exchange-clearing organizations for daily variation settlements on open futures and options-on-futures positions. The variation settlements due from or due to exchange-clearing organizations are paid in cash on the following business day. Deposits and receivables with exchange-clearing organizations also includes the unrealized gains and losses associated with the customers' options-on-futures contracts. See discussion in the Financial Instruments and Derivatives section below for additional information on the treatment of derivative contracts. For customer owned derivative contracts, the fair value is offset against the payable to customers with no impact recognized on the consolidated income statements.
Floor Brokerage, Policy [Policy Text Block]	Clearing fees and related expenses include expenses for exchange-traded futures and options-on-futures clearing and settlement services, including fees the Company pays to the exchanges and the floor pit brokers. These fees are based on transaction volume, and recorded as expense on the trade date. Clearing fees are passed on to customers and are presented gross in the consolidated statements of income under the Revenue Recognition Topic of the ASC, as the Company acts as a principal for these transactions.
Commissions Expense, Policy [Policy Text Block]	Introducing broker commissions include commissions paid to non-employee third parties that have introduced customers to the Company. Introducing brokers are individuals or organizations that maintain relationships with customers and accept futures and options orders from those customers. The Company directly provides all account, transaction and margining services to introducing brokers, including accepting money, securities and property from the customers. The commissions are determined and settled monthly.
Income Tax, Policy [Policy Text Block]	Income tax expense includes U.S. federal, state and local and foreign income taxes. Certain items of income and expense are not reported in tax returns and financial statements in the same year. The tax effect of such temporary differences is reported as deferred income taxes. Tax provisions are computed in accordance with the Income Taxes Topic of the ASC.
Comprehensive Income, Policy [Policy Text Block]	Comprehensive income consists of net income and other gains and losses affecting stockholders’ equity that, under U.S. GAAP, are excluded from net income. Other comprehensive income (loss) includes net actuarial losses from defined benefit pension plans, unrealized gains and losses on available-for-sale securities, gains and losses on foreign currency translations, and changes in the fair value of interest rate swap agreements, to the extent they are, or previously were, effective as cash flow hedges.
Consolidation, Variable Interest Entity, Policy [Policy Text Block]	In accordance with the Consolidation Topic of the Accounting Standards Codification (“ASC”) the Company consolidates any variable interest entities for which it is the primary beneficiary, as defined. The Company applies the equity method of accounting when the Company does not have a controlling interest in an entity, but exerts significant influence over the entity. The Company had a majority interest in and was the general partner of the Blackthorn Multi-Advisor Fund, LP (the “Blackthorn Fund”), whose assets, liabilities, income and expenses were included within the Company's consolidated financial statements as of and for the years ended September 30, 2011 and 2010. The Blackthorn Fund is a commodity investment pool, which allocates most of its assets to third-party commodity trading advisors and other investment managers. The Blackthorn Fund engages in speculative trading of a wide variety of commodity futures and options-on-futures contracts, securities and other financial instruments. During 2012, the Company redeemed its remaining investment in Blackthorn Fund effective December 31, 2011. As a result of the final redemption, the Company no longer retains any ownership interests in the Blackthorn Fund, has transferred its rights as general partner and deconsolidated its interest in the Blackthorn Fund as of December 31, 2011. The aggregate of the redemption and remaining noncontrolling interest less the carrying amount of the net assets of the Blackthorn Fund resulted in a nominal gain and was recorded as a component of 'trading gains, net' in the consolidated income statement for the year ended September 30, 2012, as a result of the deconsolidation. The Blackthorn Fund had net assets of $3.2 million as of September 30, 2011. The net assets of the Blackthorn fund consisted of cash and cash equivalents of $17 thousand, deposits and receivables from broker-dealers, clearing organizations and counterparties of $2.6 million, investments in managed funds of $1.3 million, and accounts payable and other accrued liabilities of $0.7 million as of September 30, 2011. The noncontrolling interest shown in the consolidated balance sheet includes the noncontrolling interest of the Blackthorn Fund of $1.3 million as of September 30, 2011. See Note 3 for discussion of fair value of the financial assets and liabilities.

Income Taxes (Policies)	12 Months Ended
Income Taxes (Policies)	Sep. 30, 2012
Income Taxes [Abstract]
Income Tax, Policy [Policy Text Block]	Income tax expense includes U.S. federal, state and local and foreign income taxes. Certain items of income and expense are not reported in tax returns and financial statements in the same year. The tax effect of such temporary differences is reported as deferred income taxes. Tax provisions are computed in accordance with the Income Taxes Topic of the ASC.

- Definition

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32840-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2144749

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 740
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6491622&loc=d3e9504-115650

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2144681

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 17
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32809-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32247-109318

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32280-109318

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 6-34, 43, 47, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 4
-Paragraph 11
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings per Share (Tables)

12 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]

The following is a reconciliation of the numerator and denominator of the diluted net income per share computations for the periods presented below.



	Year Ended September 30,
(in millions, except share amounts)	2012			2011			2010
Numerator:
Income from continuing operations attributable to INTL FCStone Inc. stockholders	$	15.0		$	37.1		$	11.8
Less: Allocation to participating securities	(0.6		)	(0.9		)	(0.2		)
Income from continuing operations allocated to common stockholders	$	14.4		$	36.2		$	11.6
Income from discontinued operations	$	—		$	0.2		$	0.6
Less: Allocation to participating securities	—			—			—
Income from discontinued operations allocated to common stockholders	$	—		$	0.2		$	0.6
Extraordinary loss	$	—		$	—		$	(7.0	)
Less: Allocation to participating securities	—			—			0.1
Extraordinary loss allocated to common stockholders	$	—		$	—		$	(6.9	)
Diluted net income	$	15.0		$	37.3		$	5.4
Less: Allocation to participating securities	(0.6		)	(0.9		)	(0.1		)
Diluted net income allocated to common stockholders	$	14.4		$	36.4		$	5.3
Denominator:
Weighted average number of:
Common shares outstanding	18,282,939			17,618,085			17,306,019
Dilutive potential common shares outstanding:
Share-based awards	873,960			949,369			577,214
Diluted weighted-average shares	19,156,899			18,567,454			17,883,233

Assets and Liabilities, at Fair Value (Tables)

12 Months Ended

Sep. 30, 2012

Assets and Liabilities, at Fair Value [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]



	September 30, 2012
(in millions)	Level 1		Level 2		Level 3		Netting and Collateral (1)			Total
Assets:
Money market funds	$	0.1	$	—	$	—	$	—		$	0.1
Certificate of deposits	10.4		—		—		—			10.4
Unrestricted cash equivalents	10.5		—		—		—			10.5
Commodities warehouse receipts	22.3		—		—		—			22.3
U.S. government obligations	—		50.5		—		—			50.5
Securities and other assets segregated under federal and other regulations	22.3		50.5		—		—			72.8
Money market funds	335.1		—		—		—			335.1
U.S. government obligations	—		1,318.3		—		—			1,318.3
Mortgage-backed securities	—		7.0		—		—			7.0
Derivatives	3,344.3		—		—		(3,494.7		)	(150.4		)
Deposits and receivables from exchange-clearing organizations	3,679.4		1,325.3		—		(3,494.7		)	1,510.0
Deposits and receivables from broker-dealers, clearing organizations and counterparties - derivatives	0.7		5.0		—		(6.4		)	(0.7		)
Common and preferred stock and American Depositary Receipts ("ADRs")	17.8		5.6		0.9		—			24.3
Exchangeable foreign ordinary equities and ADRs	10.0		—		—		—			10.0
Corporate and municipal bonds	0.3		0.6		3.6		—			4.5
U.S. government obligations	—		0.3		—		—			0.3
Foreign government obligations	14.8		—		—		—			14.8
Derivatives	315.6		785.3		—		(1,047.0		)	53.9
Commodities leases	—		135.2		—		(93.1		)	42.1
Commodities warehouse receipts	7.5		—		—		—			7.5
Exchange firm common stock	3.4		9.0		—		—			12.4
Mutual funds and other	1.9		—		—		—			1.9
Financial instruments owned	371.3		936.0		4.5		(1,140.1		)	171.7
Total assets at fair value	$	4,084.2	$	2,316.8	$	4.5	$	(4,641.2	)	$	1,764.3
Liabilities:
Accounts payable and other accrued liabilities - contingent liabilities	$	—	$	—	$	14.8	$	—		$	14.8
Payables to customers - derivatives	3,562.3		—		—		(3,562.3		)	—
Common and preferred stock and ADRs	16.4		5.9		—		—			22.3
Exchangeable foreign ordinary equities and ADRs	5.7		—		—		—			5.7
Derivatives	338.1		775.2		—		(1,068.7		)	44.6
Commodities leases	—		220.0		—		(117.2		)	102.8
Financial instruments sold, not yet purchased	360.2		1,001.1		—		(1,185.9		)	175.4
Total liabilities at fair value	$	3,922.5	$	1,001.1	$	14.8	$	(4,748.2	)	$	190.2


(1)	Represents cash collateral and the impact of netting across the levels of the fair value hierarchy. Netting among positions classified within the same level are included in that level.



	September 30, 2011
(in millions)	Level 1		Level 2		Level 3		Netting and Collateral (1)			Total
Assets:
Money market funds	$	0.1	$	—	$	—	$	—		$	0.1
Certificate of deposits	12.6		—		—		—			12.6
Unrestricted cash equivalents	12.7		—		—		—			12.7
Commodities warehouse receipts	19.0		—		—		—			19.0
U.S. government obligations	—		3.7		—		—			3.7
Securities and other assets segregated under federal and other regulations	19.0		3.7		—		—			22.7
Money market funds	1,193.5		—		—		—			1,193.5
U.S. government obligations	—		470.5		—		—			470.5
Mortgage-backed securities	—		8.5		—		—			8.5
Derivatives	7,227.4		—		—		(7,491.7		)	(264.3		)
Deposits and receivables from exchange-clearing organizations	8,420.9		479.0		—		(7,491.7		)	1,408.2
U.S. government obligations	—		0.1		—		—			0.1
Derivatives	47.3		1,073.5		—		(1,104.7		)	16.1
Deposits and receivables from broker-dealers, clearing organizations and counterparties	47.3		1,073.6		—		(1,104.7		)	16.2
Common and preferred stock and ADRs	45.6		0.2		1.1		—			46.9
Exchangeable foreign ordinary equities and ADRs	7.8		2.0		—		—			9.8
Corporate and municipal bonds	—		5.1		3.6		—			8.7
U.S. government obligations	—		0.8		—		—			0.8
Foreign government obligations	5.8		0.9		—		—			6.7
Derivatives	210.5		557.6		—		(666.2		)	101.9
Commodities leases	—		66.3		—		(40.2		)	26.1
Commodities warehouse receipts	16.2		—		—		—			16.2
Exchange firm common stock	3.0		0.7		—		—			3.7
Mutual funds and other	0.6		—		0.4		—			1.0
Investment in managed funds	—		1.3		—		—			1.3
Financial instruments owned	289.5		634.9		5.1		(706.4		)	223.1
Total assets at fair value	$	8,789.4	$	2,191.2	$	5.1	$	(9,302.8	)	$	1,682.9
Liabilities:
Accounts payable and other accrued liabilities - contingent liabilities	$	—	$	—	$	22.3	$	—		$	22.3
Payables to customers - derivatives	6,234.7		—		—		(6,234.7		)	—
Common and preferred stock and ADRs	23.4		—		—		—			23.4
Exchangeable foreign ordinary equities and ADRs	21.5		2.3		—		—			23.8
Derivatives	219.9		1,679.1		—		(1,776.1		)	122.9
Commodities leases	—		431.9		—		(211.1		)	220.8
Financial instruments sold, not yet purchased	264.8		2,113.3		—		(1,987.2		)	390.9
Total liabilities at fair value	$	6,499.5	$	2,113.3	$	22.3	$	(8,221.9	)	$	413.2

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The Company’s financial assets at fair value classified within level 3 of the fair value hierarchy as of September 30, 2012 and 2011 are summarized below:



(in millions)	September 30, 2012			September 30, 2011
Total level 3 assets	$	4.5		$	5.1
Level 3 assets for which the Company bears economic exposure	$	4.5		$	5.1
Total assets	$	2,958.9		$	2,635.7
Total financial assets at fair value	$	1,764.3		$	1,682.9
Total level 3 assets as a percentage of total assets	0.2		%	0.2		%
Level 3 assets for which the Company bears economic exposure as a percentage of total assets	0.2		%	0.2		%
Total level 3 assets as a percentage of total financial assets at fair value	0.3		%	0.3		%



	Level 3 Financial Assets and Financial Liabilities For the Year Ended September 30, 2012
(in millions)	Balances at beginning of period		Realized gains (losses) during period			Unrealized gains (losses) during period			Purchases/ issuances		Settlements			Transfers in or (out) of Level 3		Balances at end of period
Assets:
Common and preferred stock and ADRs	$	1.1	$	—		$	(0.2	)	$	—	$	—		$	—	$	0.9
Corporate and municipal bonds	3.6		—			—			—		—			—		3.6
Mutual funds and other	0.4		(0.4		)	—			—		—			—		—
	$	5.1	$	(0.4	)	$	(0.2	)	$	—	$	—		$	—	$	4.5
Liabilities:
Contingent liabilities	$	22.3	$	—		$	2.0		$	0.1	$	(9.6	)	$	—	$	14.8



	Level 3 Financial Assets and Financial Liabilities For the Year Ended September 30, 2011
(in millions)	Balances at beginning of period		Realized gains (losses) during period		Unrealized gains (losses) during period			Purchases/ issuances		Settlements			Transfers in or (out) of Level 3		Balances at end of period
Assets:
Common and preferred stock and ADRs	$	1.2	$	—	$	(0.1	)	$	—	$	—		$	—	$	1.1
Corporate and municipal bonds	8.0		—		(1.7		)	—		(2.7		)	—		3.6
Mutual funds and other	0.4		—		—			—		—			—		0.4
Investment in managed funds	0.6		0.2		—			—		(0.8		)	—		—
	$	10.2	$	0.2	$	(1.8	)	$	—	$	(3.5	)	$	—	$	5.1
Liabilities:
Contingent liabilities	$	32.3	$	—	$	(2.9	)	$	2.3	$	(9.4	)	$	—	$	22.3

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]



	September 30, 2012
(in millions)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	—	$	0.4	$	—	$	0.4
Fixed income:
Government and agencies	—		0.8		—		0.8
Collective funds:
Fixed income	—		7.7		—		7.7
Equities	—		16.6		—		16.6
Real estate	—		1.0		—		1.0
Total	$	—	$	26.5	$	—	$	26.5



	September 30, 2011
(in millions)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	—	$	0.5	$	—	$	0.5
Fixed income:
Government and agencies	—		0.9		—		0.9
Mutual funds	0.2		—		—		0.2
Collective funds:
Fixed income	—		6.0		—		6.0
Equities	—		15.5		—		15.5
Real estate	—		1.7		—		1.7
Total	$	0.2	$	24.6	$	—	$	24.8

Available-for-sale Securities [Table Text Block]

The following tables summarize the amortized cost basis, the aggregate fair value and gross unrealized holding gains and losses of the Company’s investment securities classified as available-for-sale as of September 30, 2012 and September 30, 2011:



September 30, 2012
Amounts included in deposits with and receivables from exchange-clearing organizations:
	Amortized Cost		Unrealized Holding ⁽¹⁾				Estimated Fair Value
(in millions)	Amortized Cost		Gains		(Losses)		Estimated Fair Value
U.S. government obligations	$	1,298.9	$	—	$	—	$	1,298.9
Mortgage-backed securities	6.8		0.1		—		6.9
	$	1,305.7	$	0.1	$	—	$	1,305.8


(1)	Unrealized gain/loss on U.S. government obligations as of September 30, 2012, is less than 0.1 million .



September 30, 2011
Amounts included in financial instruments owned:
	Amortized Cost		Unrealized Holding ⁽¹⁾				Estimated Fair Value
(in millions)	Amortized Cost		Gains		(Losses)		Estimated Fair Value
U.S. government obligations	$	0.5	$	—	$	—	$	0.5
Corporate bonds	5.0		—		—		5.0
	$	5.5	$	—	$	—	$	5.5


(1)	Unrealized gain/loss on financial instruments owned as of September 30, 2011, is less than $0.1 million.



Amounts included in deposits with and receivables from exchange-clearing organizations:
	Amortized Cost		Unrealized Holding				Estimated Fair Value
(in millions)	Amortized Cost		Gains		(Losses)		Estimated Fair Value
U.S. government obligations	$	440.6	$	0.1	$	—	$	440.7
Mortgage-backed securities	8.3		0.2		—		8.5
	$	448.9	$	0.3	$	—	$	449.2

As of September 30, 2012 and September 30, 2011, investments in debt securities classified as available-for-sale (AFS) mature as follows:



September 30, 2012
	Due in				Estimated Fair Value
(in millions)	Less than 1 year		1 year or more		Estimated Fair Value
U.S. government obligations	$	1,298.9	$	—	$	1,298.9
Mortgage-backed securities	—		6.9		6.9
	$	1,298.9	$	6.9	$	1,305.8



September 30, 2011
	Due in				Estimated Fair Value
(in millions)	Less than 1 year		1 year or more		Estimated Fair Value
U.S. government obligations	$	441.2	$	—	$	441.2
Corporate bonds	5.0		—		5.0
Mortgage-backed securities	—		8.5		8.5
	$	446.2	$	8.5	$	454.7

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 19, 20, 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References + Details

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References + Details

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk (Tables)

12 Months Ended

Sep. 30, 2012

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract]

Schedule of Derivative Instruments [Table Text Block]



	September 30, 2012						September 30, 2011
(in millions)	Assets ⁽¹⁾			Liabilities ⁽¹⁾			Assets ⁽¹⁾			Liabilities ⁽¹⁾
Derivative contracts not accounted for as hedges:
Exchange-traded commodity derivatives	$	3,325.6		$	3,565.3		$	7,074.2		$	6,062.4
OTC commodity derivatives	823.6			841.4			763.7			780.1
Exchange-traded foreign exchange derivatives	63.0			47.7			126.9			89.8
OTC foreign exchange derivatives ⁽²⁾⁽³⁾	215.4			196.6			1,074.3			1,118.9
Exchange-traded interest rate derivatives	0.9			2.6			2.3			2.8
OTC interest rate derivatives	1.6			—			3.2			—
Equity index derivatives	20.8			22.0			71.7			79.7
Gross fair value of derivative contracts	4,450.9			4,675.6			9,116.3			8,133.7
Impact of netting and collateral	(4,548.1		)	(4,631.0		)	(9,262.6		)	(8,010.8		)
Total fair value included in ‘Deposits and receivables from exchange-clearing organizations’	$	(150.4	)				$	(264.3	)
Total fair value included in 'Deposits and receivables from broker-dealers, clearing organizations and counterparties'	$	(0.7	)				$	16.1
Total fair value included in ‘Financial instruments owned, at fair value’	$	53.9					$	101.9
Fair value included in ‘Financial instruments sold, not yet purchased, at fair value’				$	44.6					$	122.9

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]



	Year Ended September 30,
(in millions)	2012		2011		2010
Commodities	$	65.7	$	34.1	$	(19.1	)
Foreign exchange	10.4		15.0		13.3
Interest rate	1.4		3.5		2.5
Net gains (losses) from derivative contracts	$	77.5	$	52.6	$	(3.3	)

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

+ References + Details

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Receivables from customers and notes receivable, net (Tables)

12 Months Ended

Sep. 30, 2012

Receivables from customers and notes receivable, net [Abstract]

Allowance for Credit Losses on Financing Receivables [Table Text Block]



(in millions)	2012			2011			2010
Balance, beginning of year	$	11.9		$	119.2		$	123.4
Provision for bad debts	0.4			7.2			2.3
Transfer in ⁽¹⁾	—			2.5			—
Deductions:
Charge-offs	(11.2		)	(113.3		)	(5.8		)
Recoveries	(0.1		)	(3.7		)	(0.7		)
Balance, end of year	$	1.0		$	11.9		$	119.2

Physical Commodities Inventory (Tables)

12 Months Ended

Sep. 30, 2012

Physical Commodities Inventory [Abstract]

Schedule of Inventory, Current [Table Text Block]

The carrying values of the Company’s inventory as of September 30, 2012 and 2011 are shown below.



(in millions)	September 30, 2012		September 30, 2011
Commodities in process	$	13.6	$	2.4
Finished commodities	118.0		158.2
Physical commodities inventory	$	131.6	$	160.6

Property and Equipment, Net Property and Equipment, Net (Tables)

12 Months Ended

Sep. 30, 2012

Property and Equipment, net [Abstract]

Property, Plant and Equipment [Table Text Block]

A summary of property and equipment, at cost less accumulated depreciation as of September 30, 2012 and 2011 is as follows:



(in millions)	September 30, 2012			September 30, 2011
Property and equipment:
Furniture and fixtures	$	6.3		$	4.8
Software	3.9			2.4
Equipment	9.3			6.0
Leasehold improvements	9.0			7.1
Total property and equipment	28.5			20.3
Less accumulated depreciation	(9.6		)	(5.3		)
Property and equipment, net	$	18.9		$	15.0

Goodwill (Tables)

12 Months Ended

Sep. 30, 2012

Goodwill [Abstract]

Schedule of Goodwill [Table Text Block]

Goodwill allocated to the Company’s operating segments as of September 30, 2012 and 2011 is as follows:



(in millions)	September 30, 2012		September 30, 2011
Commodity and Risk Management Services	$	32.0	$	30.9
Foreign Exchange	6.3		6.3
Securities	5.3		5.3
Goodwill	$	43.6	$	42.5

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References + Details

Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2012

Intangible Assets [Abstract]

Schedule of Finite and Indefinite-Lived Intangible Assets [Table Text Block]



	September 30, 2012							September 30, 2011
(in millions)	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Intangible assets subject to amortization
Noncompete agreement	$	3.7	$	(3.0	)	$	0.7	$	3.7	$	(1.7	)	$	2.0
Trade name	0.7		(0.5		)	0.2		0.6		(0.5		)	0.1
Software programs/platforms	2.2		(1.0		)	1.2		2.1		(0.6		)	1.5
Customer base	9.6		(1.8		)	7.8		8.9		(1.0		)	7.9
	16.2		(6.3		)	9.9		15.3		(3.8		)	11.5
Intangible assets not subject to amortization
Trade name	1.2		—			1.2		2.1		—			2.1
Total intangible assets	$	17.4	$	(6.3	)	$	11.1	$	17.4	$	(3.8	)	$	13.6

Schedule of Expected Amortization Expense [Table Text Block]



(in millions)
Fiscal 2013	$	2.0
Fiscal 2014	1.1
Fiscal 2015	0.8
Fiscal 2016	0.4
Fiscal 2017	0.4
Fiscal 2018 and thereafter	5.2
	$	9.9

Credit Facilities (Tables)

12 Months Ended

Sep. 30, 2012

Credit Facilities [Abstract]

Schedule of Debt [Table Text Block]

Credit facilities and outstanding borrowings as of September 30, 2012 and 2011 were as follows:



(in millions)					Amounts Outstanding
Borrower	Security	Renewal / Expiration Date	Total Commitment		September 30, 2012		September 30, 2011
INTL FCStone Inc.	Certain pledged shares	October 1, 2013	$	95.0	$	48.0	$	—
INTL Commodities	Certain commodities assets	January 31, 2013	140.0		107.0		60.0
FCStone, LLC	None	April 11, 2013	75.0		20.0		—
FCStone Merchants	Certain commodities assets	May 31, 2013	75.0		43.2		—
FCStone Merchants	Certain forward commodity contracts	Terminated June 2012	—		—		1.9
FCStone Financial, Inc.	Certain commodities assets	Terminated August 2012	—		—		15.5
			$	385.0	$	218.2	$	77.4

Commitments and Contingencies Future Minimum Lease Commitments (Tables)

12 Months Ended

Sep. 30, 2012

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Future aggregate minimum lease payments under noncancelable operating leases as of September 30, 2012 are as follows:



(in millions)
Year ending September 30,
	2013	$	7.1
	2014	6.1
	2015	4.9
	2016	5.7
	2017	6.3
	Thereafter	9.3
		$	39.4

Regulatory Requirements and Subsidiary Dividend Restrictions (Tables)

12 Months Ended

Sep. 30, 2012

Capital and Other Regulatory Requirements [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

Excluding INTL FCStone DTVM, all other subsidiaries of the Company are in compliance with all of their regulatory requirements as of September 30, 2012, as follows:



(in millions)			As of September 30, 2012
Subsidiary	Regulatory Authority	Requirement Type	Actual		Minimum Requirement
FCStone, LLC	CFTC	Net capital	$	124.3	$	86.3
FCStone, LLC	CFTC	Segregated funds	$	1,665.5	$	1,620.5
FCStone, LLC	CFTC	Secured funds	$	89.3	$	77.6
INTL FCStone (Europe)	FSA	Net capital	$	35.0	$	18.8
INTL FCStone (Europe)	FSA	Segregated funds	$	26.4	$	26.4
INTL Global Currencies Limited	FSA	Net capital	$	7.6	$	1.2
TRX Futures Limited	FSA	Capital adequacy	$	8.5	$	4.3
INTL FCStone Securities Inc.	SEC	Net capital	$	2.0	$	1.0
FCC Investments, Inc.	SEC	Net capital	$	0.4	$	0.3
FCStone Australia	Australian Securities and Investment Commission	Net capital	$	1.9	$	1.0
FCStone Australia	New Zealand Clearing Ltd	Capital adequacy	$	11.5	$	1.3
FCStone Europe	Central Bank of Ireland	Net capital	$	1.8	$	0.4

Schedule of Regulatory Assets [Table Text Block]



(in millions)	September 30, 2012		September 30, 2011
Cash, at banks - segregated	$	225.6	$	71.3
Securities - customer segregated	—		5.5
Securities held for customers in lieu of cash, at banks	47.2		3.7
Deposits with and receivables from:
Exchange-clearing organizations, including securities, net of omnibus eliminations	1,370.4		1,358.0
Securities held for customers in lieu of cash	22.3		19.0
Total customer-segregated funds	1,665.5		1,457.5
Amount required to be segregated	1,620.5		1,406.6
Excess funds in segregation	$	45.0	$	50.9



(in millions)	September 30, 2012		September 30, 2011
Cash - secured	$	25.2	$	6.4
Securities	3.3		—
Equities with futures commission merchants	9.9		30.3
Amounts held by clearing organizations of foreign boards of trade	20.8		—
Amounts held by members of foreign boards of trade	30.1		2.1
Total customer-secured funds	89.3		38.8
Amount required to be secured	77.6		27.2
Excess secured funds	$	11.7	$	11.6

Stock-Based Compensation (Tables)

12 Months Ended

Sep. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Fair value is estimated at the grant date based on a Black-Scholes-Merton option-pricing model using the following weighted-average assumptions:



	Year Ended September 30,
	2012		2011		2010
Expected stock price volatility	57	%	77	%	85	%
Expected dividend yield	—	%	—	%	—	%
Risk free interest rate	1.53	%	0.72	%	1.45	%
Average expected life (in years)	7.86		2.94		2.80

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following is a summary of stock option activity for the year ended September 30, 2012:



	Shares Available for Grant		Number of Options Outstanding		Weighted Average Exercise Price		Weighted Average Grant Date Fair Value		Weighted Average Remaining Term (in years)	Aggregate Intrinsic Value ($ millions)
Balances at September 30, 2011	750,481		1,344,646		$	21.05	$	8.93	3.06	$	9.8
Additional shares authorized by shareholders	1,000,000
Granted	(925,000	)	925,000		$	25.71	$	13.57
Exercised			(212,160	)	$	8.68	$	6.11
Forfeited	46,500		(46,500	)	$	25.74	$	13.53
Expired	49,431		(120,352	)	$	40.56	$	13.54
Balances at September 30, 2012	921,412		1,890,634		$	23.36	$	11.11	5.45	$	6.0
Exercisable at September 30, 2012			695,702		$	26.84	$	11.13	2.63	$	2.7

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The options outstanding as of September 30, 2012 broken down by exercise price are as follows:



Exercise Price					Number of Options Outstanding	Weighted Average Exercise Price		Weighted Average Remaining Term (in Years)
$	—	-	$	5.00	68,374	$	2.50	0.43
$	5.00	-	$	10.00	379,830	$	7.03	2.13
$	10.00	-	$	15.00	8,560	$	14.60	0.63
$	15.00	-	$	20.00	276,269	$	18.12	2.75
$	20.00	-	$	25.00	127,876	$	23.51	4.07
$	25.00	-	$	30.00	800,000	$	25.91	9.22
$	30.00	-	$	35.00	—	n/a		n/a
$	35.00	-	$	40.00	—	n/a		n/a
$	40.00	-	$	45.00	—	n/a		n/a
$	45.00	-	$	50.00	—	n/a		n/a
$	50.00	-	$	55.00	229,725	$	54.23	3.49
					1,890,634	$	23.36	5.45

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

The following is a summary of restricted stock activity through September 30, 2012:



	Shares Available for Grant		Number of Shares Outstanding		Weighted Average Grant Date Fair Value		Weighted Average Remaining Term (in years)	Aggregate Intrinsic Value ($ millions)
Balances at September 30, 2011	290,963		299,118		$	17.71	1.92	$	6.2
Termination of 2007 Plan	(22,075	)
Additional shares authorized by shareholders	1,500,000
Granted	(348,961	)	348,961		$	23.82
Vested			(135,627	)	$	16.89
Forfeited	187		(328	)	$	23.02
Balances at September 30, 2012	1,420,114		512,124		$	22.09	1.81	$	9.8

Retirement Plans Retirement Plans (Tables)

12 Months Ended

Sep. 30, 2012

Compensation and Retirement Disclosure [Abstract]

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]



(in millions)	September 30, 2012			September 30, 2011			September 30, 2010
Changes in benefit obligation:
Benefit obligation, beginning of year	$	39.0		$	37.6		$	35.6
Service cost	—			—			—
Interest cost	1.8			1.9			2.0
Actuarial loss	5.8			2.6			2.8
Benefits paid	(3.8		)	(3.1		)	(2.8		)
Benefit obligation, end of year	42.8			39.0			37.6
Changes in plan assets:
Fair value, beginning of year	24.2			24.2			18.9
Actual return	4.6			(0.4		)	1.7
Employer contribution	1.5			3.5			6.4
Benefits paid	(3.8		)	(3.1		)	(2.8		)
Fair value, end of year	26.5			24.2			24.2
Funded status	$	(16.3	)	$	(14.8	)	$	(13.4	)

Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]



(in millions)	September 30, 2012		September 30, 2011
Accumulated benefit obligations	$	42.8	$	39.0
Projected benefit obligations	$	42.8	$	39.0
Plan assets	$	26.5	$	24.2

Schedule of Assumptions Used [Table Text Block]

The following weighted-average assumptions were used to determine net periodic pension cost for the years ended September 30, 2012 and 2011:



	Year Ended September 30,
	2012	2011	2010
Weighted average assumptions:
Discount rate	4.80%	5.30%	5.90%
Expected return on assets	7.30%	7.30%	8.25%

The following weighted-average assumptions were used to determine benefit obligations in the accompanying consolidated balance sheets as of September 30, 2012 and 2011:



	September 30, 2012	September 30, 2011
Weighted average assumptions:
Discount rate	3.80%	4.80%
Expected return on assets	7.00%	7.30%

Schedule of Net Benefit Costs [Table Text Block]

The components of net periodic pension cost recognized in the consolidated income statements for the years ended September 30, 2012, 2011 and 2010 were as follows:



	Year Ended September 30,
(in millions)	2012			2011			2010
Interest cost	$	1.8		$	1.9		$	2.0
Less expected return on assets	(1.7		)	(1.7		)	(1.7		)
Net amortization and deferral	0.4			—			—
Net periodic pension cost	$	0.5		$	0.2		$	0.3

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

Other changes in plan assets and benefit obligations recognized in other comprehensive income for the years ended September 30, 2012 and 2011 were as follows:



	Year Ended September 30,
(in millions)	2012			2011
Net loss	$	2.9		$	4.6
Amortization of loss	(0.4		)	—
Total recognized in other comprehensive income	2.5			4.6
Total recognized in net periodic benefit cost and other comprehensive income	$	3.0		$	4.8

Schedule of Allocation of Plan Assets [Table Text Block]

The following table sets forth the actual asset allocation as of September 30, 2012 and 2011, and the target asset allocation for the Company’s plan assets:



	September 30, 2012	September 30, 2011	Target Asset Allocation
Equity securities	66%	70%	70%
Debt securities	34%	30%	30%
Total	100%	100%

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]



	September 30, 2012
(in millions)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	—	$	0.4	$	—	$	0.4
Fixed income:
Government and agencies	—		0.8		—		0.8
Collective funds:
Fixed income	—		7.7		—		7.7
Equities	—		16.6		—		16.6
Real estate	—		1.0		—		1.0
Total	$	—	$	26.5	$	—	$	26.5



	September 30, 2011
(in millions)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	—	$	0.5	$	—	$	0.5
Fixed income:
Government and agencies	—		0.9		—		0.9
Mutual funds	0.2		—		—		0.2
Collective funds:
Fixed income	—		6.0		—		6.0
Equities	—		15.5		—		15.5
Real estate	—		1.7		—		1.7
Total	$	0.2	$	24.6	$	—	$	24.8

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

The following table summarizes the changes in the Company’s Level 3 pension assets for the years ended September 30, 2012 and 2011:



(in millions)	Real Estate
Balance as of September 30, 2010	$	1.3
Sales	(1.3		)
Unrealized gains/(losses), net, relating to instruments still held at year end	—
Balance as of September 30, 2011	$	—
Purchases, sales, issuances and settlements, net	—
Unrealized gains/(losses), net, relating to instruments still held at year end	—
Balance as of September 30, 2012	$	—

Schedule of Expected Benefit Payments [Table Text Block]

The following benefit payments, which reflect expected future service, are expected to be paid:



(in millions)
Year ending September 30,
2013	$	4.3
2014	3.7
2015	3.3
2016	3.2
2017	2.8
2018 - 2022	9.2
	$	26.5

Other Expenses (Tables)

12 Months Ended

Sep. 30, 2012

Other Expenses [Abstract]

Schedule of Other Operating Cost and Expense, by Component [Table Text Block]

Other expenses for the years ended September 30, 2012, 2011 and 2010 are comprised of the following:



	Year Ended September 30,
(in millions)	2012		2011		2010
Business development	$	11.2	$	8.9	$	6.3
Contingent consideration, net⁽¹⁾	2.9		4.7		—
Insurance	1.7		1.5		1.8
Advertising, meetings and conferences	2.4		1.8		1.7
Non-trading hardware and software maintenance and software licensing	2.2		2.8		1.3
Office supplies and printing	1.3		1.1		1.2
Other non-income taxes	4.0		2.8		1.3
Other	5.3		4.9		3.5
Total other expenses	$	31.0	$	28.5	$	17.1

Income Taxes Income Taxes (Tables)

12 Months Ended

Sep. 30, 2012

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The components of the provision for income taxes attributable to income from continuing operations were as follows:



	Year Ended September 30,
(in millions)	2012			2011		2010
Current taxes:
U.S. Federal	$	(5.7	)	$	9.1	$	—
U.S. State and local	0.5			1.7		0.4
International	10.1			9.9		4.8
Total current taxes	4.9			20.7		5.2
Deferred taxes	(0.5		)	1.8		1.2
Income tax expense	$	4.4		$	22.5	$	6.4

Income tax expense (benefit) for the years ended September 30, 2012, 2011 and 2010 was allocated as follows:



	Year Ended September 30,
(in millions)	2012			2011			2010
Income tax expense attributable to income from continuing operations	$	4.4		$	22.5		$	6.4
Income tax expense attributable to loss from discontinued operations	—			0.1			0.6
Income tax expense attributable to extraordinary loss	—			—			5.8
Taxes allocated to stockholders' equity, related to unrealized gains (losses) on available-for-sale securities	2.2			(0.3		)	0.1
Taxes allocated to stockholders' equity, related to pension liabilities	(1.0		)	(1.7		)	(1.1		)
Taxes allocated to stockholders' equity, related to unrealized loss on derivatives	—			0.6			0.7
Taxes allocated to additional paid-in capital, related to stock-based compensation	(0.2		)	—			—
Total income tax expense	$	5.4		$	21.2		$	12.5

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

U.S. and international components of income (loss) from continuing operations, before income taxes, was as follows:



	Year Ended September 30,
(in millions)	2012			2011		2010
U.S.	$	(13.7	)	$	27.3	$	4.4
International	33.0			32.2		13.5
Income from continuing operations, before tax	$	19.3		$	59.5	$	17.9

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Items accounting for the difference between income taxes computed at the federal statutory rate and the provision for income taxes were as follows:



	Year Ended September 30,
	2012		2011		2010
Federal statutory rate effect of:	35.0	%	35.0	%	35.0	%
U.S. State income taxes	(1.2	)%	0.9	%	2.9	%
Foreign earnings taxed at lower rates	(16.7	)%	(2.9	)%	(7.0	)%
Change in foreign valuation allowance	1.8	%	0.7	%	5.0	%
Change in state valuation allowance	(0.2	)%	1.0	%	—	%
Tax impact of state rate change	—	%	1.1	%	—	%
Uncertain tax positions	(1.2	)%	1.4	%	—	%
Non-deductible meals and entertainment	2.2	%	—	%	(0.8	)%
Foreign permanent items	4.9	%	—	%	—	%
Other reconciling items	(3.4	)%	0.6	%	0.5	%
Effective rate	21.2	%	37.8	%	35.6	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The components of deferred income tax assets and liabilities were as follows:



(in millions)	September 30, 2012			September 30, 2011
Deferred tax assets:
Stock-based compensation	$	2.5		$	1.9
Pension liability	6.1			5.5
Deferred compensation	3.2			4.0
Foreign net operating loss carryforwards	2.0			1.5
State net operating loss carryforwards	4.9			4.1
Intangible assets	6.1			5.0
Partnership tax basis timing differences	1.1			2.4
Bad debt reserve	0.1			1.1
Foreign tax credit	0.3			0.6
Other compensation	4.5			3.3
Other	1.2			1.2
Total gross deferred tax assets	32.0			30.6
Less valuation allowance	(4.1		)	(3.7		)
Deferred tax assets	27.9			26.9
Deferred income tax liabilities:
Unrealized gain on securities	3.1			1.1
Prepaid expenses	1.1			1.5
Fixed assets	3.8			3.6
Deferred income tax liabilities	8.0			6.2
Net deferred tax assets	$	19.9		$	20.7

Summary of Income Tax Contingencies [Table Text Block]

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:



	Year Ended September 30,
(in millions)	2012			2011		2010
Balance, beginning of year	$	0.9		$	—	$	—
Gross increases for tax positions related to current year	—			—		—
Gross increases for tax positions related to prior years	—			0.9		—
Gross decreases for tax positions of prior years	(0.1		)	—		—
Settlements	(0.1		)	—		—
Lapse of statute of limitations	(0.2		)	—		—
Balance, end of year	$	0.5		$	0.9	$	—

- Definition

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

+ References + Details

Quarterly Financial Information Quarterly Financial Information (Tables)

12 Months Ended

Sep. 30, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

The Company has set forth certain quarterly unaudited financial data for the past two years in the tables below:



	For the 2012 Fiscal Quarter Ended
(in millions, except per share amounts)	September 30		June 30		March 31		December 31
Total revenues	17,668.1		17,351.1		16,951.0		17,290.4
Cost of sales of physical commodities	17,550.1		17,227.3		16,831.4		17,194.1
Operating revenues	$	118.0	$	123.8	$	119.6	$	96.3
Interest expense	3.3		2.6		3.6		2.1
Net revenues	114.7		121.2		116.0		94.2
Total non-interest expense	104.2		115.3		112.4		94.9
Income (loss), before tax	10.5		5.9		3.6		(0.7		)
Income tax expense (benefit)	2.2		1.2		1.2		(0.2		)
Net income (loss)	8.3		4.7		2.4		(0.5		)
Add: Net loss attributable to noncontrolling interests	—		—		—		0.1
Net income (loss) attributable to INTL FCStone Inc. common stockholders	$	8.3	$	4.7	$	2.4	$	(0.4	)
Net basic earnings (loss) per share	$	0.44	$	0.24	$	0.13	$	(0.02	)
Net diluted earnings (loss) per share	$	0.42	$	0.23	$	0.12	$	(0.02	)



	For the 2011 Fiscal Quarter Ended
(in millions, except per share amounts)	September 30			June 30		March 31		December 31
Total revenues	$	24,070.4		$	20,573.4	$	14,583.0	$	16,270.8
Cost of sales of physical commodities	$	23,962.3		$	20,468.0	$	14,470.0	$	16,174.1
Operating revenues	$	108.1		$	105.4	$	113.0	$	96.7
Interest expense	2.2			2.0		3.3		3.8
Net revenues	105.9			103.4		109.7		92.9
Total non-interest expense	92.9			86.1		86.4		87.0
Income from continuing operations, before tax	13.0			17.3		23.3		5.9
Income tax expense	5.4			7.0		8.0		2.1
Income from continuing operations	7.6			10.3		15.3		3.8
Income from discontinued operations	—			—		—		0.2
Net income	7.6			10.3		15.3		4.0
Add: Net (income) loss attributable to noncontrolling interests	(0.1		)	0.1		0.1		—
Net income attributable to INTL FCStone Inc. common stockholders	$	7.5		$	10.4	$	15.4	$	4.0
Net basic earnings per share	$	0.41		$	0.58	$	0.87	$	0.23
Net diluted earnings per share	$	0.39		$	0.55	$	0.81	$	0.22

Segment and Geographic Information (Tables)

12 Months Ended

Sep. 30, 2012

Segment Analysis [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

Information concerning operations in these segments of business is shown in accordance with the Segment Reporting Topic of the ASC as follows:



	Year Ended September 30,
(in millions)	2012			2011		2010
Total revenues:
Commodity and Risk Management Services	$	68,928.3		$	75,274.1	$	46,785.2
Foreign Exchange	62.6			59.3		47.5
Securities	39.9			30.5		20.8
Clearing and Execution Services	93.8			66.1		61.8
Other	136.2			67.2		24.8
Corporate unallocated	(0.2		)	0.4		0.2
Total	$	69,260.6		$	75,497.6	$	46,940.3
Operating revenues (loss):
Commodity and Risk Management Services	$	246.0		$	252.6	$	129.8
Foreign Exchange	62.6			59.3		47.5
Securities	39.9			30.5		20.8
Clearing and Execution Services	93.8			66.1		61.8
Other	15.6			14.3		8.9
Corporate unallocated	(0.2		)	0.4		0.2
Total	$	457.7		$	423.2	$	269.0
Net contribution:
(Revenues less cost of sales, clearing and related expenses, variable bonus compensation, introducing broker commissions and interest expense):
Commodity and Risk Management Services	$	143.0		$	151.6	$	70.9
Foreign Exchange	41.3			37.1		28.0
Securities	19.8			16.5		11.4
Clearing and Execution Services	14.3			14.3		10.7
Other	10.3			10.0		7.1
Total	$	228.7		$	229.5	$	128.1
Net segment income:
(Net contribution less non-variable direct segment costs):
Commodity and Risk Management Services	$	69.7		$	93.5	$	32.8
Foreign Exchange	28.3			28.0		21.8
Securities	4.5			1.9		5.6
Clearing and Execution Services	2.2			4.9		1.1
Other	5.4			5.6		3.7
Total	$	110.1		$	133.9	$	65.0
Reconciliation of segment income to income from continuing operations, before tax:
Net segment income	$	110.1		$	133.9	$	65.0
Costs not allocated to operating segments	90.8			74.4		47.1
Income from continuing operations, before tax	$	19.3		$	59.5	$	17.9

(in millions)	As of September 30, 2012			As of September 30, 2011
Total assets:
Commodity and Risk Management Services	$	1,449.2		$	1,540.8
Foreign Exchange	124.5			146.1
Securities	88.7			104.8
Clearing and Execution Services	1,090.9			734.4
Other	110.8			43.4
Corporate unallocated	94.8			66.2
Total	$	2,958.9		$	2,635.7

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]



	Year Ended September 30,
(in millions)	2012		2011		2010
Total revenues:
United States	$	55,564.8	$	53,660.2	$	31,962.7
Europe	69.9		35.1		20.4
South America	58.2		53.3		17.8
Asia	13,555.3		21,738.4		14,926.6
Other	12.4		10.6		12.8
Total	$	69,260.6	$	75,497.6	$	46,940.3

Operating revenues:
United States	$	297.3	$	302.1	$	213.4
Europe	69.9		35.1		20.4
South America	58.2		53.3		17.8
Asia	19.9		27.6		14.4
Other	12.4		5.1		3.0
Total	$	457.7	$	423.2	$	269.0

(in millions)	As of September 30, 2012		As of September 30, 2011
Long-lived assets, as defined:
United States	$	11.5	$	10.7
Europe	3.8		2.0
South America	2.8		1.6
Asia	0.7		0.6
Other	0.1		0.1
Total	$	18.9	$	15.0

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Basis of Presentation and Consolidation (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2012 $ / shares	Sep. 30, 2011 USD ($) $ / shares
Net Assets of Investments [Line Items]
Preferred Stock, Par or Stated Value Per Share \| $ / shares	$ 0.01	$ 0.01
Number of different types of foreign currencies	130
Number of customers company-wide	20,000
Accounts Payable [Member]
Net Assets of Investments [Line Items]
Net Assets of Investment in Managed Funds		$ 700
Cash and Cash Equivalents [Member]
Net Assets of Investments [Line Items]
Net Assets of Investment in Managed Funds		17
Deposits and Receivables from Broker-dealers, clearing organizations and counterparties [Member]
Net Assets of Investments [Line Items]
Net Assets of Investment in Managed Funds		2,600
Investment in managed funds [Member]
Net Assets of Investments [Line Items]
Net Assets of Investment in Managed Funds		1,300
Noncontrolling Interest [Member]
Net Assets of Investments [Line Items]
Net Assets of Investment in Managed Funds		$ 1,300

Description of Business and Significant Accounting Policies Cash, Cash Equivalents, Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Cash, Cash Equivalents, and Securities Disclosed in Significant Accounting Policies [Abstract]
Convertible Debt Holder's Principal Balance			$ 16.7
Cash Held at Banks and Money Market Funds - Segregated	$ 284.7	$ 96.7
US Government Obligations and other securities	50.5	3.7
Commodities Warehouse Receipts	22.3	19.0
Cash and Cash Equivalents - Deposits and Receivables	400.0	1,200.0
US Government Securities and Other Securities - Deposits and Receivables	1,300.0	500.0
Secured Deficits - US T-bills	0.8	0.4
Secured Deficits - Commodities Warehouse Receipts	7.5	16.2
Proceeds from Sale of Property, Plant, and Equipment	1.5
Gain (Loss) on Sale of Property Plant Equipment	0.9
Acquisition of Memberships in Exchanges		3.4
Memberships in Exchanges Owned	10.5	10.3
Proceeds from Shares of Exchanges Sold		1.2
Fair Value of Exchange Memberships	$ 8.9	10.5
Debt Instrument, Interest Rate, Stated Percentage			7.625%
Accrued interest on convertible		$ 0.2
Stock Issued During Period, Shares, Conversion of Convertible Securities		778,703

Description of Business and Significant Accounting Policies Blackthorn Investment (Details) $ in Millions	Sep. 30, 2011 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Investment in Funds Net Assets	$ 3.2

Earnings per Share - Antidulitive Securities (Details) - shares	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,157,601	386,031	815,066

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations Attributable to Parent	$ 15.0	$ 37.1	$ 11.8
Undistributed Earnings Allocated to Participating Securities - Continuing Ops	(0.6)	(0.9)	(0.2)
Income from continuing operations allocated to common stockholders	14.4	36.2	11.6
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.2	0.6
Undistributed Earnings Allocated to Participating Securities - Disc Ops	0.0	0.0	0.0
Income from discontinued operations allocated to common stockholders	0.0	0.2	0.6
Extraordinary loss	0.0	0.0	(7.0)
Less: Allocation to participating securities	0.0	0.0	0.1
Extraordinary loss allocated to common stockholders	0.0	0.0	(6.9)
Net Income (Loss) Available to Common Stockholders, Diluted	15.0	37.3	5.4
Undistributed Earnings Allocated to Participating Securities	(0.6)	(0.9)	(0.1)
Diluted net income allocated to common stockholders	$ 14.4	$ 36.4	$ 5.3
Weighted Average Number of Shares Outstanding, Basic	18,282,939	17,618,085	17,306,019
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Stock Options And Warrants For Diluted Earnings Per Share Calculation	873,960	949,369	577,214
Diluted weighted-average shares	19,156,899	18,567,454	17,883,233

Assets and Liabilities, at Fair Value - Details of Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Assets and Liabilities, at Fair Value [Abstract]
Total Level 3 Assets	$ 4.5	$ 5.1
Level 3 assets for which the company bears economic exposure	4.5	5.1
Assets	2,958.9	2,635.7
Assets, Fair Value Disclosure	$ 1,764.3	$ 1,682.9
Total level 3 assets as a percentage of total assets	0.20%	0.20%
Level 3 assets for which the company bears economic exposure as a percertange of total assets	0.20%	0.20%
Total level 3 assets as a percentage of total financial assets at fair value	0.30%	0.30%

Assets and Liabilities, at Fair Value - Rollforward of Level 3 (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Rollforward of Level 3 Securities [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 5.1	$ 10.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(0.4)	0.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	(0.2)	(1.8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0.0	(3.5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	4.5	5.1
Contingent Consideration [Member]
Rollforward of Level 3 Liabilities [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	22.3	32.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)	2.0	(2.9)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	(9.6)	(9.4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	14.8	22.3
Common stock and American Depositary Receipts (ADRs) [Member]
Rollforward of Level 3 Securities [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	1.1	1.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	(0.2)	(0.1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0.9	1.1
Corporate Debt Securities [Member]
Rollforward of Level 3 Securities [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	3.6	8.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	0.0	(1.7)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0.0	(2.7)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	3.6	3.6
Mutual funds and other [Member]
Rollforward of Level 3 Securities [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0.4	0.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(0.4)	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0.0	0.4
Investment in managed funds [Member]
Rollforward of Level 3 Securities [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 0.0	0.6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)		0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements		(0.8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net		0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		$ 0.0

Assets and Liabilities, at Fair Value - Schedule of Financial Instruments Owned and Sold, Not Yet Purchased (Details) $ in Millions	Sep. 30, 2012 USD ($)
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Derivative Liabilities	$ 44.6

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References + Details

Assets and Liabilities, at Fair Value - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 4.5	$ 5.1	$ 10.2
Cash and Securities Segregated under Federal and Other Regulations	357.5	119.4
Receivables from Clearing Organizations	1,619.8	1,489.2
Receivables from Brokers-Dealers and Clearing Organizations	127.4	146.5
Financial instruments, owned, at fair value	171.7	223.1
Equity Investments in Exchange Stock - Fair Value	12.4	3.7
Equity Investments in Exchange Stock - Cost	4.4	4.4
Assets, Fair Value Disclosure	1,764.3	1,682.9
Total Level 3 Assets	4.5	5.1
Accounts payable and other accrued liabilities	127.0	122.0
Payables to Customers	2,072.3	1,739.8
Financial Instruments Sold, Not yet Purchased, at Fair Value	175.4	390.9
Derivative Liabilities	44.6
Level 3 assets for which the company bears economic exposure	4.5	5.1
Assets	$ 2,958.9	$ 2,635.7
Total level 3 assets as a percentage of total assets	0.20%	0.20%
Level 3 assets for which the company bears economic exposure as a percertange of total assets	0.20%	0.20%
Total level 3 assets as a percentage of total financial assets at fair value	0.30%	0.30%
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ (0.4)	$ 0.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	(0.2)	(1.8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0.0	(3.5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0.0	0.0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	10.5	12.7
Cash and Securities Segregated under Federal and Other Regulations	72.8	22.7
Receivables from Clearing Organizations	1,510.0	1,408.2
Receivables from Brokers-Dealers and Clearing Organizations		16.2
Financial instruments, owned, at fair value	171.7	223.1
Financial Instruments Sold, Not yet Purchased, at Fair Value		390.9
Liabilities, Fair Value Disclosure	190.2	413.2
Fair Value, Measurements, Recurring [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payables to Customers	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts payable and other accrued liabilities	14.8	22.3
Fair Value, Measurements, Recurring [Member] \| Investment in managed funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value		1.3
Fair Value, Measurements, Recurring [Member] \| Commodities leases and unpriced positions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	42.1	26.1
Financial Instruments Sold, Not yet Purchased, at Fair Value	102.8	220.8
Fair Value, Measurements, Recurring [Member] \| Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	14.8	6.7
Fair Value, Measurements, Recurring [Member] \| Common stock and American Depositary Receipts (ADRs) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	24.3	46.9
Financial Instruments Sold, Not yet Purchased, at Fair Value	22.3	23.4
Fair Value, Measurements, Recurring [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	4.5	8.7
Fair Value, Measurements, Recurring [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.3	0.8
Fair Value, Measurements, Recurring [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	53.9	101.9
Financial Instruments Sold, Not yet Purchased, at Fair Value		122.9
Fair Value, Measurements, Recurring [Member] \| Commodities warehouse receipts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	7.5	16.2
Fair Value, Measurements, Recurring [Member] \| Exchangeable foreign ordinary equities and ADRs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	10.0	9.8
Financial Instruments Sold, Not yet Purchased, at Fair Value	5.7	23.8
Fair Value, Measurements, Recurring [Member] \| Mutual funds and other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	1.9	1.0
Fair Value, Measurements, Recurring [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Brokers-Dealers and Clearing Organizations		0.0
Fair Value, Measurements, Recurring [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Brokers-Dealers and Clearing Organizations	(0.7)	16.1
Fair Value, Measurements, Recurring [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	335.1	1,193.5
Fair Value, Measurements, Recurring [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	1,318.3	470.5
Fair Value, Measurements, Recurring [Member] \| Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	7.0	8.5
Fair Value, Measurements, Recurring [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	(150.4)	(264.3)
Fair Value, Measurements, Recurring [Member] \| Commodities warehouse receipts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Securities Segregated under Federal and Other Regulations	22.3	19.0
Fair Value, Measurements, Recurring [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Securities Segregated under Federal and Other Regulations	50.5	3.7
Fair Value, Measurements, Recurring [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.1	0.1
Fair Value, Measurements, Recurring [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	10.4	12.6
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	10.5	12.7
Cash and Securities Segregated under Federal and Other Regulations	22.3	19.0
Receivables from Clearing Organizations	3,679.4	8,420.9
Receivables from Brokers-Dealers and Clearing Organizations		47.3
Financial instruments, owned, at fair value	371.3	289.5
Assets, Fair Value Disclosure	4,084.2	8,789.4
Financial Instruments Sold, Not yet Purchased, at Fair Value	360.2	264.8
Liabilities, Fair Value Disclosure	3,922.5	6,499.5
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payables to Customers	3,562.3	6,234.7
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts payable and other accrued liabilities	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Investment in managed funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value		0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Exchange firm common stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	3.4	3.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Commodities leases and unpriced positions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	14.8	5.8
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Common stock and American Depositary Receipts (ADRs) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	17.8	45.6
Financial Instruments Sold, Not yet Purchased, at Fair Value	16.4	23.4
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.3	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	315.6	210.5
Financial Instruments Sold, Not yet Purchased, at Fair Value	338.1	219.9
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Commodities warehouse receipts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	7.5	16.2
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Exchangeable foreign ordinary equities and ADRs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	10.0	7.8
Financial Instruments Sold, Not yet Purchased, at Fair Value	5.7	21.5
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Mutual funds and other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	1.9	0.6
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Brokers-Dealers and Clearing Organizations		0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Brokers-Dealers and Clearing Organizations	0.7	47.3
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	335.1	1,193.5
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	3,344.3	7,227.4
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Commodities warehouse receipts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Securities Segregated under Federal and Other Regulations	22.3	19.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Securities Segregated under Federal and Other Regulations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.1	0.1
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	10.4	12.6
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Cash and Securities Segregated under Federal and Other Regulations	50.5	3.7
Receivables from Clearing Organizations	1,325.3	479.0
Receivables from Brokers-Dealers and Clearing Organizations		1,073.6
Financial instruments, owned, at fair value	936.0	634.9
Assets, Fair Value Disclosure	2,316.8	2,191.2
Financial Instruments Sold, Not yet Purchased, at Fair Value	1,001.1	2,113.3
Liabilities, Fair Value Disclosure	1,001.1	2,113.3
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payables to Customers	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts payable and other accrued liabilities	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Investment in managed funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value		1.3
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Exchange firm common stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	9.0	0.7
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Commodities leases and unpriced positions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	135.2	66.3
Financial Instruments Sold, Not yet Purchased, at Fair Value	220.0	431.9
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.9
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Common stock and American Depositary Receipts (ADRs) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	5.6	0.2
Financial Instruments Sold, Not yet Purchased, at Fair Value	5.9	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.6	5.1
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.3	0.8
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	785.3	557.6
Financial Instruments Sold, Not yet Purchased, at Fair Value	775.2	1,679.1
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Commodities warehouse receipts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Exchangeable foreign ordinary equities and ADRs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	2.0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0.0	2.3
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Mutual funds and other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Brokers-Dealers and Clearing Organizations		0.1
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Brokers-Dealers and Clearing Organizations	5.0	1,073.5
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	1,318.3	470.5
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	7.0	8.5
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Commodities warehouse receipts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Securities Segregated under Federal and Other Regulations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Securities Segregated under Federal and Other Regulations	50.5	3.7
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Cash and Securities Segregated under Federal and Other Regulations	0.0	0.0
Receivables from Clearing Organizations	0.0	0.0
Receivables from Brokers-Dealers and Clearing Organizations		0.0
Financial instruments, owned, at fair value	4.5	5.1
Financial Instruments Sold, Not yet Purchased, at Fair Value	0.0	0.0
Liabilities, Fair Value Disclosure	14.8	22.3
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payables to Customers	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts payable and other accrued liabilities	14.8	22.3
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Investment in managed funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value		0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Exchange firm common stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Commodities leases and unpriced positions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Common stock and American Depositary Receipts (ADRs) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.9	1.1
Financial Instruments Sold, Not yet Purchased, at Fair Value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	3.6	3.6
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Commodities warehouse receipts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Exchangeable foreign ordinary equities and ADRs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Mutual funds and other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.4
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Brokers-Dealers and Clearing Organizations		0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Brokers-Dealers and Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Commodities warehouse receipts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Securities Segregated under Federal and Other Regulations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Securities Segregated under Federal and Other Regulations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Cash and Securities Segregated under Federal and Other Regulations	0.0	0.0
Receivables from Clearing Organizations	(3,494.7)	(7,491.7)
Receivables from Brokers-Dealers and Clearing Organizations		(1,104.7)
Financial instruments, owned, at fair value	(1,140.1)	(706.4)
Assets, Fair Value Disclosure	(4,641.2)	(9,302.8)
Financial Instruments Sold, Not yet Purchased, at Fair Value	(1,185.9)	(1,987.2)
Liabilities, Fair Value Disclosure	(4,748.2)	(8,221.9)
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payables to Customers	(3,562.3)	(6,234.7)
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts payable and other accrued liabilities	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Investment in managed funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value		0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Exchange firm common stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Commodities leases and unpriced positions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	(93.1)	(40.2)
Financial Instruments Sold, Not yet Purchased, at Fair Value	(117.2)	(211.1)
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Common stock and American Depositary Receipts (ADRs) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	(1,047.0)	(666.2)
Financial Instruments Sold, Not yet Purchased, at Fair Value	(1,068.7)	(1,776.1)
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Commodities warehouse receipts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Exchangeable foreign ordinary equities and ADRs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Mutual funds and other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, owned, at fair value	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Brokers-Dealers and Clearing Organizations		0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Brokers-Dealers and Clearing Organizations	(6.4)	(1,104.7)
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables from Clearing Organizations	(3,494.7)	(7,491.7)
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Commodities warehouse receipts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Securities Segregated under Federal and Other Regulations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| US Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Securities Segregated under Federal and Other Regulations	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Fair Value, Measurements, Recurring [Member] \| Netting [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Investment in managed funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0.0	0.6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)		0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements		(0.8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net		0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		0.0
Mutual funds and other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0.0	0.4	0.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(0.4)	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0.0	0.0
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	3.6	3.6	8.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	0.0	(1.7)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0.0	(2.7)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0.0	0.0
Common stock and American Depositary Receipts (ADRs) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0.9	1.1	1.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	(0.2)	(0.1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0.0	0.0
Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	(9.6)	(9.4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	14.8	22.3	$ 32.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)	2.0	(2.9)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	$ 0.1	$ 2.3

Assets and Liabilities, at Fair Value - Suriwongse Bonds (Details) ฿ in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2012 THB (฿)	Sep. 30, 2012 USD ($)
Assets and Liabilities, at Fair Value [Abstract]
Suriwongse Debt Investment - Original Investment	฿ 0.0	$ 0.0
Suriwongse Debt Investment - Interest Rate	9.50%	9.50%
Sale of A Portion of the Suriwongse Debt Investment	฿ 0.0	$ 0.0
Sale of the Suriwongse Debt Investment to Two Investors	0.0	$ 0.0
Suriwongse Debt Investment - Maxium Interest Funding with Sale Proceed \| ฿	฿ 0.0
Ownership % of shares of single asset owning company (Suriwongse)	100.00%	100.00%
Suriwongse Debt Investment Balance		$ 3.6
Loss on Suriwongse Debt Investment		$ (1.7)

Assets and Liabilities, at Fair Value - Contingent Consideration (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)	$ 2.0	$ (2.9)

Assets and Liabilities, at Fair Value - Available for Sale Securities - Fin Inst (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 1,305.7	$ 448.9
Available-for-sale Securities, Gross Unrealized Gains	0.1	0.3
Available-for-sale Securities, Gross Unrealized Losses	0.0	0.0
Available-for-sale Securities, Debt Securities	$ 1,305.8	454.7
Financial instruments owned [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis			$ 5.5
Available-for-sale Securities, Gross Unrealized Gains			0.0
Available-for-sale Securities, Gross Unrealized Losses			0.0
Available-for-sale Securities, Debt Securities			5.5
Available-for-sale Securities, Gross Unrealized Gain (Loss)		$ 0.1
US Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis			0.5
Available-for-sale Securities, Gross Unrealized Gains			0.0
Available-for-sale Securities, Gross Unrealized Losses			0.0
Available-for-sale Securities, Debt Securities			0.5
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis			5.0
Available-for-sale Securities, Gross Unrealized Gains			0.0
Available-for-sale Securities, Gross Unrealized Losses			0.0
Available-for-sale Securities, Debt Securities			$ 5.0

- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-Subparagraph (b)-(g)
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 137
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15C
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Assets and Liabilities, at Fair Value - Available for Sale Securities - Dep and Rec (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 1,305.7	$ 448.9
Available-for-sale Securities, Gross Unrealized Gains	0.1	0.3
Available-for-sale Securities, Gross Unrealized Losses	0.0	0.0
Available-for-sale Securities, Debt Securities	1,305.8	454.7
US Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,298.9	440.6
Available-for-sale Securities, Gross Unrealized Gains	0.0	0.1
Available-for-sale Securities, Gross Unrealized Losses	0.0	0.0
Available-for-sale Securities, Debt Securities	1,298.9	440.7
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	6.8	8.3
Available-for-sale Securities, Gross Unrealized Gains	0.1	0.2
Available-for-sale Securities, Gross Unrealized Losses	0.0	0.0
Available-for-sale Securities, Debt Securities	6.9	8.5
Deposits and Receivables from Exchange Clearing Organizations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gain (Loss)	0.1
Available-for-sale Securities, Debt Securities	$ 1,305.8	449.2
Financial instruments owned [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gain (Loss)		$ 0.1
Available-for-sale Debt Securities, Amortized Cost Basis			$ 5.5
Available-for-sale Securities, Gross Unrealized Gains			0.0
Available-for-sale Securities, Gross Unrealized Losses			0.0
Available-for-sale Securities, Debt Securities			$ 5.5

Assets and Liabilities, at Fair Value - Available for Sale Securities (Maturities) (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	$ 1,298.9	$ 446.2
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	6.9	8.5
Available-for-sale Securities, Debt Securities	1,305.8	454.7
US Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	1,298.9	441.2
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	0.0	0.0
Available-for-sale Securities, Debt Securities	1,298.9	441.2
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value		5.0
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value		0.0
Available-for-sale Securities, Debt Securities		5.0
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	0.0	0.0
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	6.9	8.5
Available-for-sale Securities, Debt Securities	$ 6.9	$ 8.5

- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

+ Details

Assets and Liabilities, at Fair Value - Available for Sale Securities in OCI (Details) - USD ($) $ in Thousands	Sep. 30, 2012	Sep. 30, 2011
Assets and Liabilities, at Fair Value [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	$ (90)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	53
Equity Investments in Exchange Stock - Cost	4,400	$ 4,400
Equity Investments in Exchange Stock - Fair Value	12,400	3,700
Equity Investments in Exchange Stock - LME Shares Fair Value	8,700
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax - LME Shares	(6,300)
Deferred Tax Liabilities, Accumulated Other Comprehensive Income - LME Shares	2,000
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax - Other Exchange Shares	300	400
Deferred Tax Assets, Accumulated Other Comprehensive Income - Other Exchange Shares	$ (100)	$ (300)

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Obligations to Purchase Financial Instruments at a Future Date (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract]
Financial Instruments Sold, Not yet Purchased, at Fair Value	$ 175.4	$ 390.9
Derivatives Liabilties	$ 44.6

- Definition

+ References + Details

- Definition

Fair value of obligations incurred from short sales.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6475908&loc=d3e42429-110968

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-BRD
-Paragraph 2
-IssueDate 2006-05-01
-Chapter 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-BRD
-Paragraph 40
-IssueDate 2006-05-01
-Chapter 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-BRD
-Paragraph 38
-IssueDate 2006-05-01
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-BRD
-Paragraph 19
-IssueDate 2006-05-01
-Chapter 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Derivatives Volume (Details) number in Millions	12 Months Ended
	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)
Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract]
Derivative, Collateral, Obligation to Return Cash	$ 9,200,000	$ 0
Derivative, Collateral, Right to Reclaim Cash	0	53,500,000
Notional Amount of Interest Rate Derivatives	$ 765,000,000	$ 1,100,000,000
Derivative, Average Remaining Maturity	6 months	14 months
Derivative, Number of Instruments Held	4.1	3.9

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Gross Derivative Assets and Liabilities by Type and Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 4,450.9	$ 9,116.3
Derivative Liability, Fair Value, Gross Liability	4,675.6	8,133.7
Derivative Asset, Fair Value, Amount Offset Against Collateral	(4,548.1)	(9,262.6)
Derivative Liability, Fair Value, Amount Offset Against Collateral	(4,631.0)	(8,010.8)
Derivative, Collateral, Right to Reclaim Cash	0.0	53.5
Exchange-traded Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	3,325.6	7,074.2
Derivative Liability, Fair Value, Gross Liability	3,565.3	6,062.4
Over the Counter (OTC) Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	823.6	763.7
Derivative Liability, Fair Value, Gross Liability	841.4	780.1
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	63.0	126.9
Derivative Liability, Fair Value, Gross Liability	47.7	89.8
Over the Counter (OTC) Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	215.4	1,074.3
Derivative Liability, Fair Value, Gross Liability	196.6	1,118.9
Exchange-traded interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.9	2.3
Derivative Liability, Fair Value, Gross Liability	2.6	2.8
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1.6	3.2
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Equity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	20.8	71.7
Derivative Liability, Fair Value, Gross Liability	22.0	79.7
Deposits and receivables from exchange clearing organizations [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(150.4)	(264.3)
Deposits and receivables from broker-dealers, clearing organizations and counterparties [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(0.7)	16.1
Financial instruments owned [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	53.9	101.9
Financial instrument sold, not yet purchased [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ 44.6	$ 122.9

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Realized Gains/Losses on Derivative Contracts (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 65.7	$ 34.1	$ (19.1)
Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	10.4	15.0	13.3
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	1.4	3.5	2.5
Derivative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 77.5	$ 52.6	$ (3.3)

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References + Details

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk Interest Rate Cash Flow Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Mar. 31, 2011	Dec. 31, 2010
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Amount of Interest Rate Cash Flow Hedge Derivatives	$ 50.0
Accumulated other comprehensive, unrealized gain (loss) on cash flow interest rate swaps			$ 0.6	$ 0.2
Notional Amount of Interest Rate Derivatives	1,100.0	$ 765.0
Cash Flow Hedge Loss Reclassified to Earnings	$ 0.3

Receivables from customers and notes receivable, net - Allowance for Customer Receivables (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Receivables from customers and notes receivable, net [Abstract]
Closed Derivative Contracts - Deficit Balance	$ 0.0	$ 2.5	$ 0.0
Allowance Notes Receivable	0.1	0.1
Allowance for Doubtful Accounts Receivable	$ 0.9	$ 11.8

Receivables from customers and notes receivable, net - Allowance for Notes Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Receivables from customers and notes receivable, net [Abstract]
Allowance Notes Receivable	$ 0.1	$ 0.1

Receivables from customers and notes receivable, net - Bad Debt Expense and Recoveries (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Doubtful Accounts Receivable, Charge-offs		$ (11.2)	$ (113.3)	$ (5.8)
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease)		0.4	7.2	2.3
Allowance for Doubtful Accounts Receivable, Recoveries		0.0	(3.7)	(0.7)
Consigned gold bad debt expense				2.5
C&RM Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Doubtful Accounts		0.7	4.5
Allowance for Doubtful Accounts Receivable, Charge-offs		0.8	8.2
Allowance for Doubtful Accounts Receivable, Recoveries		0.1	3.7
CES Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
CR&M customer deficit charge-off			$ 3.7
Consigned gold charge-off		8.5
CES customer deficits charge-off		$ 2.7
FCStone LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Doubtful Accounts				3.5
Allowance for Doubtful Accounts Receivable, Charge-offs				4.2
Allowance for Doubtful Accounts Receivable, Recoveries	$ 0.7			15.5
FCM give-up bad debt expense				$ 2.3

Receivables from customers and notes receivable, net - Allowance for Bad Debts Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for Doubtful Accounts - Customer and Notes Receivable	$ 11.9	$ 119.2	$ 123.4
Provision for Doubtful Accounts	0.4	7.2	2.3
Closed Derivative Contracts - Deficit Balance	0.0	2.5	0.0
Allowance for Doubtful Accounts Receivable, Charge-offs	(11.2)	(113.3)	(5.8)
Allowance for Doubtful Accounts Receivable, Recoveries	0.0	(3.7)	(0.7)
Allowance for Doubtful Accounts - Customer and Notes Receivable	$ 1.0	$ 11.9	$ 119.2

Receivables from customers and notes receivable, net - Notes Receivable (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Doubtful Accounts Receivable, Charge-offs		$ (11.2)	$ (113.3)	$ (5.8)
Allowance for Doubtful Accounts Receivable, Recoveries		0.0	(3.7)	(0.7)
Financing Receivable, Net		92.5	24.3
FCStone LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Doubtful Accounts Receivable, Charge-offs				4.2
Allowance for Doubtful Accounts Receivable, Recoveries	$ 0.7			15.5
Remaining Acquired Notes Receivable		$ 1.2
Acquired notes receivable				$ 133.7
Notes Receivable					$ 16.7
Notes receivable recovered during the year			15.6
Notes receivable charge-off during the year			$ 111.5

Receivables from customers and notes receivable, net Exim Bank Notes Receivable (Details) $ in Millions	12 Months Ended
	Sep. 30, 2012 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Insured short-term notes receivable	$ 10.2
Notes Sold through Participation Agreements	$ 0.8
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short Term Notes Receivable Outstanding Balance Threshold, Percentage	90.00%
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short Term Notes Receivable Outstanding Balance Threshold, Percentage	98.00%

Physical Commodities Inventory - Inventory Serving as Collateral (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Physical Commodities Inventory [Abstract]
Inventory serving as collateral	$ 129.1	$ 159.4
Inventory Adjustments	$ 0.4	$ 21.9

Physical Commodities Inventory - Physical Commodities Inventory by CIP and Finished (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Physical Commodities Inventory [Abstract]
Commodities in process	$ 13.6	$ 2.4
Finished commodities	118.0	158.2
Physical commodities inventory	$ 131.6	$ 160.6

Property and Equipment, Net Property and Equipment, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Property, Plant and Equipment [Line Items]
Depreciation	$ 4.7	$ 2.4	$ 1.0
Furniture and Fixtures, Gross	6.3	4.8
Capitalized Computer Software, Gross	3.9	2.4
Machinery and Equipment, Gross	9.3	6.0
Leasehold Improvements, Gross	9.0	7.1
Property, Plant and Equipment, Gross	28.5	20.3
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	9.6	5.3
Property, Plant and Equipment, Net	$ 18.9	$ 15.0
Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	10 years

Goodwill - Goodwill by Segment (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Goodwill [Line Items]
Goodwill	$ 43.6	$ 42.5
Commodity and Risk Management [Member]
Goodwill [Line Items]
Goodwill	32.0	30.9
Foreign Exchange [Member]
Goodwill [Line Items]
Goodwill	6.3	6.3
Securities [Member]
Goodwill [Line Items]
Goodwill	$ 5.3	$ 5.3

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Goodwill Additions to Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Goodwill [Abstract]
Goodwill, Acquired During Period	$ 1.1	$ 2.2

Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Trade Names, Gross	$ 0.1
Finite-Lived Intangible Assets, Gross	16.2	$ 15.3
Finite-Lived Intangible Assets, Accumulated Amortization	(6.3)	(3.8)
Finite-Lived Intangible Assets, Net	9.9	11.5
Goodwill	43.6	42.5
Gross Finite and Indefinite-Lived Intangible Assets	17.4	17.4
Finite and Indefinited-Lived Accumulated Amortization and Impairment Charges	(6.3)	(3.8)
Intangible Assets, Net (Excluding Goodwill)	11.1	13.6
Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Noncompete Agreements, Gross	3.7	3.7
Finite-Lived Intangible Assets, Accumulated Amortization	(3.0)	(1.7)
Finite-Lived Intangible Assets, Net	0.7	2.0
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Trade Names, Gross	0.7	0.6
Finite-Lived Intangible Assets, Accumulated Amortization	(0.5)	(0.5)
Finite-Lived Intangible Assets, Net	0.2	0.1
Computer Software, Intangible Asset [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Computer Software, Gross	2.2	2.1
Finite-Lived Intangible Assets, Accumulated Amortization	(1.0)	(0.6)
Finite-Lived Intangible Assets, Net	1.2	1.5
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Customer Lists, Gross	9.6	8.9
Finite-Lived Intangible Assets, Accumulated Amortization	(1.8)	(1.0)
Finite-Lived Intangible Assets, Net	$ 7.8	$ 7.9

Intangible Assets - Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Indefinite-lived Intangible Assets [Line Items]
Gross Finite and Indefinite-Lived Intangible Assets	$ 17.4	$ 17.4
Finite and Indefinited-Lived Accumulated Amortization and Impairment Charges	(6.3)	(3.8)
Intangible Assets, Net (Excluding Goodwill)	11.1	13.6
Trade Names [Member]
Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Trade Names	1.2	2.1
Indefinite-lived Intangible Assets, Impairment Losses	$ 0.0	$ 0.0

Intangible Assets - Finite-Lived Intangible Assets Future Amortization Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Intangible Assets [Abstract]
Amortization of Intangible Assets	$ 2.5	$ 2.3	$ 0.7
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Fiscal 2013	2.0
Fiscal 2014	1.1
Fiscal 2015	0.8
Fiscal 2016	0.4
Fiscal 2017	0.4
Fiscal 2018 and thereafter	5.2
Finite-Lived Intangible Assets, Net	$ 9.9	$ 11.5

Intangible Assets Intangible Impairments (Details) $ in Millions	12 Months Ended
	Sep. 30, 2012 USD ($)
Intangible Assets [Abstract]
Impairment of Intangible Assets (Excluding Goodwill)	$ (0.8)
Finite-Lived Intangible Assets, Gross	$ 0.1

Credit Facilities - Number of Credit Facilities (Details) $ in Millions	12 Months Ended
	Sep. 30, 2012 USD ($) Rate
Line of Credit Facility [Line Items]
Number of credit facilities	4
Main line of credit facilities [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity \| $	$ 385.0
HCO Syndicated line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity \| $	$ 95.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage \| Rate	0.625%
Line of Credit Facility, Interest Rate at Period End \| Rate	3.22%
Debt Issuance Cost \| $	$ 1.2
INTL COM line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity \| $	$ 140.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage \| Rate	0.75%
Line of Credit Facility, Interest Rate at Period End \| Rate	0.21%
Debt Issuance Cost \| $	$ 0.2
FCS Margin line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity \| $	$ 75.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage \| Rate	0.50%
Line of Credit Facility, Interest Rate at Period End \| Rate	5.25%
Eurodollar Rate [Member] \| HCO Syndicated line of credit facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.00%
Eurodollar Rate [Member] \| INTL COM line of credit facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.875%
Base Rate [Member] \| HCO Syndicated line of credit facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Base Rate [Member] \| FCS Margin line of credit facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%

Credit Facilities - Credit Facilities (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 218.2	$ 77.4
Main line of credit facilities [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 385.0
INTL COM line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate at Period End	0.21%
Line of Credit Facility, Maximum Borrowing Capacity	$ 140.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.75%
Line of Credit Facility, Amount Outstanding	$ 107.0	60.0
HCO Syndicated line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate at Period End	3.22%
Line of Credit Facility, Maximum Borrowing Capacity	$ 95.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.625%
Line of Credit Facility, Amount Outstanding	$ 48.0	0.0
FCS Margin line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate at Period End	5.25%
Line of Credit Facility, Maximum Borrowing Capacity	$ 75.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
Line of Credit Facility, Amount Outstanding	$ 20.0	0.0
FMS Sub-note commodity line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate at Period End	2.39%
Line of Credit Facility, Maximum Borrowing Capacity	$ 75.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
Line of Credit Facility, Amount Outstanding	$ 43.2	0.0
FCF Sub-note commodity line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0.0
Line of Credit Facility, Amount Outstanding	0.0	15.5
FMS line of credit for uncommited forward contracts [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0.0
Line of Credit Facility, Amount Outstanding	$ 0.0	$ 1.9

Commitments and Contingencies - Contingencies and Litigation (Details) - USD ($)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Mar. 31, 2012
Commitments and Contingencies [Abstract]
Asset Impairment Charges	$ 0	$ 0	$ 1,100,000
Equity Method Investment, Ownership Percentage			55.00%
Equity Method Investment, Realized Gain (Loss) on Disposal	100,000
Convertible Debt Holder's Principal Balance - Investor who filed litigation	$ 3,700,000
Redemption Premium % for Convertible Debt	15.00%
Debt Conversion, Converted Instrument, Default Rate	15.00%
Convertible Debt Holder's Principal Balance - Remaining Three Holders	$ 13,000,000
Convertible Debt Holder's Principal Balance - Two Holders who continued litigation	4,000,000
Loss Contingency, Settlement Agreement, Consideration	250,000			$ 200,000
Excess segregated funds returned	15,500,000
Excess segregated funds invested	21,900,000
Pre and Post Transfers of Funds related to Sentinel	15,500,000
Customer Segregated Transfers of Funds Pursuant to Safe Harbor	$ 1,100,000

Commitments and Contingencies - Contigent Consideration for Acquisitions (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Nov. 30, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Contingent Consideration, Potential Cash Payment, Year One					$ 0.3
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ 2.1	$ 5.4	$ 26.3
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed	0.4
Hencorp Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0.1	0.5
Business Acquisition, Contingent Consideration, at Fair Value	2.5
RMI-RMC Acquistion [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0.0	(1.5)
Business Acquisition, Contingent Consideration, at Fair Value	2.9
Coffee Network Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Contingent Consideration, at Fair Value				$ 0.1
Hencorp Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Contingent Consideration, Potential Cash Payment					0.3
Business Acquisition, Contingent Consideration, Potential Cash Payment, Year Two					0.4
Business Acquisition, Contingent Consideration, Potential Cash Payment Year Three					2.3
Business Acquisition, Cost of Acquired Entity, Purchase Price	6.5	6.4
Business Acquisition, Contingent Consideration, at Fair Value					$ 2.3
Hanley Group Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Contingent Consideration, Potential Cash Payment, Year One						$ 10.0
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	2.0	4.2
Business Acquisition, Cost of Acquired Entity, Purchase Price	53.5	51.6
Business Acquisition, Contingent Consideration, at Fair Value	$ 9.3					$ 15.6
Contingent payments equal to a % of the forecasted adjusted earnings before interest and taxes	15.00%
RMI-RMC Acquistion [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Contingent Consideration, Potential Cash Payment, Year One							$ 3.1
Business Acquisition, Cost of Acquired Entity, Purchase Price	$ 15.1	$ 15.2
Business Acquisition, Contingent Consideration, at Fair Value							$ 10.7

Commitments and Contingencies Operating Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Operating Leases [Abstract]
Operating Leases, Rent Expense	$ 8.9	$ 7.2	$ 5.5
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	7.1
Operating Leases, Future Minimum Payments, Due in Two Years	6.1
Operating Leases, Future Minimum Payments, Due in Three Years	4.9
Operating Leases, Future Minimum Payments, Due in Four Years	5.7
Operating Leases, Future Minimum Payments, Due in Five Years	6.3
Operating Leases, Future Minimum Payments, Due Thereafter	9.3
Operating Leases, Future Minimum Payments Due	$ 39.4

Commitments and Contingencies Purchase Obligations (Details) $ in Millions	Sep. 30, 2012 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase Obligation, Due in Next Twelve Months	$ 635.5
Purchase Obligation, Due in Second and Third Year	6.1
Purchase Obligation, Due in Fourth and Fifth Year	3.3
Purchase Obligation, Due after Fifth Year	$ 2.4

Commitments and Contingencies Impairment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Commitments and Contingencies [Abstract]
Asset Impairment Charges	$ 0.0	$ 0.0	$ 1.1
Equity Method Investment, Ownership Percentage			55.00%
Equity Method Investment, Realized Gain (Loss) on Disposal	$ 0.1

Regulatory Requirements and Subsidiary Dividend Restrictions - Minimum net capital (Details)	Sep. 30, 2012
Capital and Other Regulatory Requirements [Abstract]
Ratio of Indebtedness to Net Capital	15
Ratio of Indebtedness to Net Capital - Equity Withdrawal Limitation	10

Regulatory Requirements and Subsidiary Dividend Restrictions - Regulatory Capital Requirements (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Cash and Securities Segregated under Commodity Exchange Act Regulation	$ 1,665.5	$ 1,457.5
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated	1,620.5	1,406.6
Secured funds	89.3	38.8
Secured Funds Required Under Commodity Exchange Act	77.6	$ 27.2
FCStone LLC [Member]
Net Capital under Commodity Exchange Act Computation	124.3
Required Net Capital under Commodity Exchange Act	86.3
INTL FCStone Europe [Member]
Net Capital under Commodity Exchange Act Computation	35.0
Required Net Capital under Commodity Exchange Act	18.8
Net Capital	26.4
Cash and Securities Segregated under Commodity Exchange Act Regulation	26.4
INTL Global Currencies [Member]
Net Capital under Commodity Exchange Act Computation	7.6
Required Net Capital under Commodity Exchange Act	1.2
TRX Futures [Member]
Net Capital	8.5
Capital Required for Capital Adequacy	4.3
INTL Trading [Member]
Net Capital	2.0
Minimum Net Capital Required for Entity	1.0
FCC Investments [Member]
Net Capital	0.4
Minimum Net Capital Required for Entity	0.3
FCStone Australia [Member]
Net Capital under Commodity Exchange Act Computation	1.9
Required Net Capital under Commodity Exchange Act	1.0
Net Capital	11.5
Capital Required for Capital Adequacy	1.3
FCStone Europe [Member]
Net Capital under Commodity Exchange Act Computation	1.8
Required Net Capital under Commodity Exchange Act	$ 0.4

Regulatory Requirements and Subsidiary Dividend Restrictions Regulatory Requirements and Subsidiary Dividend Restrictions - Customer Secured Funds (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Cash and Securities Segregated under Commodity Exchange Act [Abstract]
Cash Segregated under Commodity Exchange Act Regulation	$ 225.6	$ 71.3
Securities Segregated under Commodity Exchange Act Regulation	0.0	5.5
Securities Held for Customers in Lieu of Cash, At Banks, Segregated under Commodity Exchange Act Regulation	47.2	3.7
Deposits with and Receivables From Clearing Organizations, Segregated under Commodity Exchange Act Regulation	1,370.4	1,358.0
Securities Held for Customers in Lieu of Cash, Segregated under Commodity Exchange Act Regulation	22.3	19.0
Cash and Securities Segregated under Commodity Exchange Act Regulation	1,665.5	1,457.5
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated	1,620.5	1,406.6
Cash and Securities Segregated under Commodity Exchange Act Regulation, Excess Funds in Segregation	45.0	50.9
Cash and Securities Segregated under Other Regulations [Abstract]
Cash Segregated under Other Regulations	25.2	6.4
Securities Segregated under Other Regulations	3.3	0.0
Equities with Futures Commission Merchants Segregated under Other Regulations	9.9	30.3
Amounts Held by Clearing Organizations Segregated under Other Regulations	20.8	0.0
Amounts Held by Members of Foreign Boards of Trade Segregated under Other Regulations	30.1	2.1
Secured funds	89.3	38.8
Secured Funds Required Under Commodity Exchange Act	77.6	27.2
Cash and Securities Segregated under Other Regulations	$ 11.7	$ 11.6

Commodity and Other Repurchase Agreements Commodity and Other Repurchase Agreements (Details) - USD ($)	Sep. 30, 2012	Sep. 30, 2011
Assets Sold under Agreements to Repurchase [Line Items]
Financing Receivables, net - Sales/Repurchase Agreements	$ 92,500,000	$ 24,300,000
Broker-dealers, Clearing Organizations and Counterparties [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Obligations outstanding related to commodities sold under repurchase agreements	37,000,000	0
Lenders Under Loans [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Obligations outstanding related to commodities sold under repurchase agreements	$ 43,200,000	$ 17,400,000

Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Allocated Share-based Compensation Expense	$ 5.9	$ 2.3	$ 1.9

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Stock-Based Compensation - Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options	$ 11.6
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	3,250,000	2,250,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	6 years 1 month 2 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 3.0	$ 1.6	$ 1.4
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	921,412	750,481
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 13.57	$ 11.66	$ 8.12

Stock-Based Compensation - Stock Option Plan Fair Value Weighted-Average Assumptions (Details)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	57.00%	77.00%	85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.53%	0.72%	1.45%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	7 years 10 months 10 days	2 years 11 months 9 days	2 years 9 months 18 days

Stock-Based Compensation - Stock Based Compensation Table (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	750,481
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,344,646
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	(925,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease)	925,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(212,160)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	46,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period	(46,500)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Net	49,431
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	(120,352)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	921,412	750,481
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,890,634	1,344,646
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	695,702
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 23.36	$ 21.05
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	25.71
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	8.68
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	25.74
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	40.56
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	26.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value	11.11	8.93
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	13.57	$ 11.66	$ 8.12
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excrecises in Period, Weighted Average Grant Date Fair Value	6.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeited in Period, Weighted Average Grant Date Fair Value	13.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expired in Period, Weighted Average Grant Date Fair Value	13.54
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excercisable, Weighted Average Grant Date Fair Value	$ 11.13
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 5 months 12 days	3 years 22 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	2 years 7 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 6.0	$ 9.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	2.7
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options	$ 11.6
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	6 years 1 month 2 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 3.0	$ 1.6	$ 1.4
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	3,250,000	2,250,000

Stock-Based Compensation - Restricted Stock Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	1,500,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 7.7
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition - Restricted Stock	1 year 9 months 22 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	1,420,114	290,963

Stock-Based Compensation Options by Exercise Price (Details)	12 Months Ended
	Sep. 30, 2012 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	1,890,634
Weighted Average Exercise Price	$ 23.36
Weighted Average Remaining Term (in years)	5 years 5 months 12 days
$0 - $5,00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	68,374
Weighted Average Exercise Price	$ 2.50
Weighted Average Remaining Term (in years)	5 months 4 days
Exercise Price Range, Lower Range Limit	$ 0.00
Exercise Price Range, Upper Range Limit	$ 5.00
$5.00 - $10.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	379,830
Weighted Average Exercise Price	$ 7.03
Weighted Average Remaining Term (in years)	2 years 1 month 17 days
Exercise Price Range, Lower Range Limit	$ 5.00
Exercise Price Range, Upper Range Limit	$ 10.00
$10.00 - $15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	8,560
Weighted Average Exercise Price	$ 14.60
Weighted Average Remaining Term (in years)	7 months 17 days
Exercise Price Range, Lower Range Limit	$ 10.00
Exercise Price Range, Upper Range Limit	$ 15.00
$15.00 - $20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	276,269
Weighted Average Exercise Price	$ 18.12
Weighted Average Remaining Term (in years)	2 years 9 months
Exercise Price Range, Lower Range Limit	$ 15.00
Exercise Price Range, Upper Range Limit	$ 20.00
$20.00 - $25.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	127,876
Weighted Average Exercise Price	$ 23.51
Weighted Average Remaining Term (in years)	4 years 25 days
Exercise Price Range, Lower Range Limit	$ 20.00
Exercise Price Range, Upper Range Limit	$ 25.00
$25.00 - $30.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	800,000
Weighted Average Exercise Price	$ 25.91
Weighted Average Remaining Term (in years)	9 years 2 months 19 days
Exercise Price Range, Lower Range Limit	$ 25.00
Exercise Price Range, Upper Range Limit	$ 30.00
$30.00 - $35.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	0
Exercise Price Range, Lower Range Limit	$ 30.00
Exercise Price Range, Upper Range Limit	$ 35.00
$35.00 - $40.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	0
Exercise Price Range, Lower Range Limit	$ 35.00
Exercise Price Range, Upper Range Limit	$ 40.00
$40.00 - $45.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	0
Exercise Price Range, Lower Range Limit	$ 40.00
Exercise Price Range, Upper Range Limit	$ 45.00
$45.00 - $50.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	0
Exercise Price Range, Lower Range Limit	$ 45.00
Exercise Price Range, Upper Range Limit	$ 50.00
$50.00 - $55.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options \| shares	229,725
Weighted Average Exercise Price	$ 54.23
Weighted Average Remaining Term (in years)	3 years 5 months 26 days
Exercise Price Range, Lower Range Limit	$ 50.00
Exercise Price Range, Upper Range Limit	$ 55.00

Stock-Based Compensation - Restricted Stock Plan Table (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted	1,420,114	290,963
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	299,118
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Other	(22,075)
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)	(348,961)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	348,961
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(135,627)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(328)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures	187
ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted	1,420,114	290,963
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	512,124	299,118
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 22.09	$ 17.71
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	23.82
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	16.89
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 23.02
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	1 year 9 months 22 days	1 year 11 months 1 day
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value	$ 9,800,000	$ 6,200,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 7.7
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition - Restricted Stock	1 year 9 months 22 days

Retirement Plans Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Defined Benefit Plan, Fair Value of Plan Assets	$ 26.5	$ 24.2	$ 24.2	$ 18.9
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	$ 2.9	4.6
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	100.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 3.7	$ 2.8	$ 2.1
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	$ (0.4)	$ 0.0
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.80%	5.30%	5.90%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.80%	4.80%
Defined Benefit Plan, Accumulated Benefit Obligation	$ 42.8	$ 39.0
Defined Benefit Plan, Amounts Recognized in Balance Sheet	(16.4)	(15.0)
Defined Benefit Plan, Benefit Obligation	42.8	39.0	$ 37.6	$ 35.6
Defined Benefit Plan, Service Cost	0.0	0.0	0.0
Defined Benefit Plan, Interest Cost	1.8	1.9	2.0
Defined Benefit Plan, Actuarial Gain (Loss)	5.8	2.6	2.8
Defined Benefit Plan, Expected Future Benefit Payments, Total	26.5
Defined Benefit Plan, Actual Return on Plan Assets	4.6	(0.4)	1.7
Defined Benefit Plan, Contributions by Employer	1.5	3.5	6.4
Defined Benefit Plan, Benefits Paid	(3.8)	(3.1)	(2.8)
Defined Benefit Plan, Funded Status of Plan	(16.3)	(14.8)	(13.4)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	6.2	4.6
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	0.8
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	2.5
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	42.8	39.0
Defined Benefit Plan, Expected Return on Plan Assets	$ (1.7)	$ (1.7)	$ (1.7)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.30%	7.30%	8.25%
Defined Benefit Plan, Amortization of Gains (Losses)	$ 0.4	$ 0.0	$ 0.0
Defined Benefit Plan, Net Periodic Benefit Cost	0.5	$ 0.2	0.3
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	4.3
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	3.7
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	3.3
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	3.2
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	2.8
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 9.2
Weighted Average Discount Rate, Percent	7.00%	7.30%
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax	$ 2.5	$ 4.6
Defined Benefit Plan, Amounts Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), Net Gain (Loss), before Tax	$ 3.0	$ 4.8
Debt Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	34.00%	30.00%
Defined Benefit Plan, Target Allocation Percentage	0.3
Equity Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	66.00%	70.00%
Defined Benefit Plan, Target Allocation Percentage	0.7
Other Assets [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet	$ 0.1	$ 0.2
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.2
Fair Value, Inputs, Level 1 [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0
Fair Value, Inputs, Level 1 [Member] \| US Treasury and Government [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0
Fair Value, Inputs, Level 1 [Member] \| Mutual funds and other [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0.2
Fair Value, Inputs, Level 1 [Member] \| Debt Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0
Fair Value, Inputs, Level 1 [Member] \| Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0
Fair Value, Inputs, Level 1 [Member] \| Real Estate [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	26.5	24.6
Fair Value, Inputs, Level 2 [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.4	0.5
Fair Value, Inputs, Level 2 [Member] \| US Treasury and Government [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.8	0.9
Fair Value, Inputs, Level 2 [Member] \| Mutual funds and other [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0.0
Fair Value, Inputs, Level 2 [Member] \| Debt Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	7.7	6.0
Fair Value, Inputs, Level 2 [Member] \| Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	16.6	15.5
Fair Value, Inputs, Level 2 [Member] \| Real Estate [Member]
Defined Benefit Plan, Fair Value of Plan Assets	1.0	1.7
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0	$ 1.3
Fair Value, Inputs, Level 3 [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0
Fair Value, Inputs, Level 3 [Member] \| US Treasury and Government [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0
Fair Value, Inputs, Level 3 [Member] \| Mutual funds and other [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0.0
Fair Value, Inputs, Level 3 [Member] \| Debt Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0
Fair Value, Inputs, Level 3 [Member] \| Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0
Fair Value, Inputs, Level 3 [Member] \| Real Estate [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0
Estimate of Fair Value, Fair Value Disclosure [Member]
Defined Benefit Plan, Fair Value of Plan Assets	26.5	24.8
Estimate of Fair Value, Fair Value Disclosure [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.4	0.5
Estimate of Fair Value, Fair Value Disclosure [Member] \| US Treasury and Government [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.8	0.9
Estimate of Fair Value, Fair Value Disclosure [Member] \| Mutual funds and other [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0.2
Estimate of Fair Value, Fair Value Disclosure [Member] \| Debt Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	7.7	6.0
Estimate of Fair Value, Fair Value Disclosure [Member] \| Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	16.6	15.5
Estimate of Fair Value, Fair Value Disclosure [Member] \| Real Estate [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 1.0	$ 1.7
Savings Incentive Match Plan for Employees IRA [Member]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	3.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	100.00%
UK Plan [Member]
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	100.00%
UK Plan [Member] \| Maximum [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent	10.00%
401k Plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent	62.50%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	8.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage, Two to Three Years	20.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage, Three to Four Years	40.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage, Four to Five Years	60.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage, All Years	100.00%
401k Plan [Member] \| Maximum [Member]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	80.00%
401k Plan [Member] \| Minimum [Member]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	1.00%

Retirement Plans Change in Level 3 Pension Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	$ 24.2	$ 24.2
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	26.5	24.2
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.2
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.2
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	24.6
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	26.5	24.6
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.0	1.3
Defined Benefit Plan, Divestitures, Plan Assets		(1.3)
Defined Benefit Plan, Actual Return on Plan Assets Still Held	0.0	0.0
Defined Benefit Plan, Purchases, Sales, and Settlements	0.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.0
Estimate of Fair Value, Fair Value Disclosure [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	24.8
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	26.5	24.8
Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.0
Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.5
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.4	0.5
Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.0
Cash and Cash Equivalents [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.5
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.4	0.5
US Treasury and Government [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.0
US Treasury and Government [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.9
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.8	0.9
US Treasury and Government [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.0
US Treasury and Government [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.9
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.8	0.9
Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.0
Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	6.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	7.7	6.0
Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.0
Debt Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	6.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	7.7	6.0
Equity Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.0
Equity Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	15.5
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	16.6	15.5
Equity Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.0
Equity Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	15.5
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	16.6	15.5
Real Estate [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.0
Real Estate [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	1.7
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	1.0	1.7
Real Estate [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	0.0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	0.0	0.0
Real Estate [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	1.7
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	$ 1.0	$ 1.7

Other Expenses - Other Expenses Breakout (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	$ 31.0	$ 28.5	$ 17.1
Travel and Entertainment Expense [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	11.2	8.9	6.3
Contingent Consideration [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	2.9	4.7	0.0
Insurance Expense [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	1.7	1.5	1.8
Advertising, Meetings and Conferences [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	2.4	1.8	1.7
Non-trading hardware and software maintenance and software licensing [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	2.2	2.8	1.3
Office supplies and printing [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	1.3	1.1	1.2
Taxes Other than Income and Excise Taxes [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	4.0	2.8	1.3
Other Operating Expense [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	$ 5.3	$ 4.9	$ 3.5

Income Taxes (Details) - USD ($)	12 Months Ended
Income Taxes (Details) - USD ($)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Taxes [Abstract]
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 400,000
Undistributed Earnings of Foreign Subsidiaries	130,700,000	$ 75,700,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	300,000
Operating Loss Carryforwards	2,800,000	1,900,000
Deferred Tax Assets, Valuation Allowance	(4,100,000)	(3,700,000)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	300,000	200,000	$ 0
Income Tax Expense (Benefit), Continuing Operations	4,400,000	22,500,000	6,400,000
Discontinued Operation, Tax Effect of Discontinued Operation	0	100,000	600,000
Income Tax Expense (Benefit), Extraordinary Items	0	0	5,800,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	2,200,000	(300,000)	100,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Tax	(1,000,000)	(1,700,000)	(1,100,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	0	600,000	700,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(200,000)	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	200,000	0
Other Comprehensive Income (Loss), Tax	$ 5,400,000	$ 21,200,000	$ 12,500,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%

Income Taxes Current and Deferred Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ (5.7)	$ 9.1	$ 0.0
Current State and Local Tax Expense (Benefit)	0.5	1.7	0.4
Current Foreign Tax Expense (Benefit)	10.1	9.9	4.8
Current Income Tax Expense (Benefit)	4.9	20.7	5.2
Deferred Income Tax Expense (Benefit)	(0.5)	1.8	1.2
Income Tax Expense (Benefit), Continuing Operations	$ 4.4	$ 22.5	$ 6.4

- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Paragraph Question 1-7

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

+ Details

- Definition

The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted state and local tax law to relevant amounts of taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

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-Name Accounting Standards Codification
-Topic 740
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-Section 50
-Paragraph 9
-Subparagraph (a)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-Section 50
-Paragraph 9
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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-Paragraph 9
-Subparagraph (a),(b)
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-Name Accounting Standards Codification
-Topic 235
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-Paragraph 1
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45, 46
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 15, 16, 19
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes US and International Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ (13.7)	$ 27.3	$ 4.4
Income (Loss) from Continuing Operations before Income Taxes, Foreign	33.0	32.2	13.5
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 19.3	$ 59.5	$ 17.9

Income Taxes Effective Rate Reconciliation (Details)	12 Months Ended
Income Taxes Effective Rate Reconciliation (Details)	Sep. 30, 2012 Rate	Sep. 30, 2011 Rate	Sep. 30, 2010 Rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential	(16.70%)	(2.90%)	(7.00%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate	0.00%	1.10%	0.00%
Effective Income Tax Rate Reconciliation, Tax Contingencies	(1.20%)	1.40%	0.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes	(1.20%)	0.90%	2.90%
Effective Income Tax Rate Reconciliation, Deductions, Other	(3.40%)	1.00%	0.50%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment	2.20%	0.00%	(0.80%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other	4.90%	0.00%	0.00%
Effective Income Tax Rate, Continuing Operations	21.20%	37.80%	35.60%
Foreign Tax Authority [Member]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance	1.80%	0.70%	5.00%
State and Local Jurisdiction [Member]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance	(0.20%)	1.00%	0.00%

Income Taxes Deferred Tax Assets and Liabilites (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	$ 2.5	$ 1.9
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	6.1	5.5
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	3.2	4.0
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	2.0	1.5
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	4.9	4.1
Deferred Tax Liabilities, Intangible Assets	6.1	5.0
Deferred Tax Assets, Equity Method Investments	1.1	2.4
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	0.1	1.1
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	0.3	0.6
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	4.5	3.3
Deferred Tax Assets, Other	1.2	1.2
Deferred Tax Assets, Gross	32.0	30.6
Deferred Tax Assets, Valuation Allowance	(4.1)	(3.7)
Deferred Tax Assets, Net of Valuation Allowance	27.9	26.9
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	3.1	1.1
Deferred Tax Liabilities, Prepaid Expenses	1.1	1.5
Deferred Tax Liabilities, Property, Plant and Equipment	3.8	3.6
Deferred Tax Liabilities, Gross	8.0	6.2
Deferred Tax Assets, Net	$ 19.9	$ 20.7

Income Taxes FIN 48 Analysis (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance beginning of year	$ 0.9	$ 0.0	$ 0.0
Gross increases for tax positions related to current year	0.0	0.0	0.0
Gross increases for tax positions related to prior years	0.0	0.9	0.0
Gross decreases for tax positions of prior years	(0.1)	0.0	0.0
Settlements	(0.1)	0.0	0.0
Lapse of statute of limitations	(0.2)	0.0	0.0
Balance end of year	$ 0.5	$ 0.9	$ 0.0

Acquisitions (Details) $ / shares in Units, $ in Millions			1 Months Ended					3 Months Ended	12 Months Ended			13 Months Ended
Acquisitions (Details) $ / shares in Units, $ in Millions	Apr. 30, 2012 USD ($)	Nov. 25, 2011 USD ($) professional	Nov. 30, 2011 USD ($) payment	Oct. 31, 2010 USD ($) payment	Sep. 30, 2010 USD ($) shares	Jul. 31, 2010 USD ($) payment $ / shares shares	Apr. 30, 2010 USD ($) payment	Dec. 31, 2010 USD ($)	Sep. 30, 2012 USD ($) business shares	Sep. 30, 2011 USD ($) business shares	Sep. 30, 2010 USD ($) business	Sep. 30, 2011 USD ($) shares	Feb. 29, 2012 USD ($)	Aug. 31, 2011 USD ($)	Apr. 30, 2011 USD ($)
Business Acquisition [Line Items]
Number of Businesses Acquired \| business									3	2	3
Goodwill, Expected Tax Deductible Amount					$ 39.8				$ 0.7	$ 4.9	$ 39.8	$ 4.9
Business Acquisition, Cost of Acquired Entity, Cash Paid, Payment 1					6.0						6.0
Business Combination, Contingent Consideration Arrangements, Number of Annual Payments \| payment							2
Acquisition Measurement Period During Which Valuations Are Finalized			1 year
Goodwill									$ 43.6	42.5		42.5
Business Acquisition, Cost of Acquired Entity, Cash Paid, Payment 2										3.1		3.1
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Shares Released from Escrow \| shares									3,255
Coffee Network Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Business Acquisition, Cost of Acquired Entity, Cash Paid, Payment 1			$ 0.2
Business Combination, Contingent Consideration Arrangements, Number of Annual Payments \| payment			3
Business Combination, Consideration Transferred			$ 0.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles			$ 0.2
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			2 years
MF Metals Team Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles		$ 0.5
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		3 years
Business Combination, Professionals Hired From Acquiree Company \| professional		50
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles		$ 1.0
TRX Futures Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Combination, Consideration Transferred	$ 12.9
Acquisition Measurement Period During Which Valuations Are Finalized	1 year
Goodwill	$ 0.3
Business Combination, Consideration, Including Contingent Consideration							$ 15.2
DTVM Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired													100.00%
Business Combination, Consideration Transferred													$ 1.5
Goodwill													$ 0.8
Hencorp Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Contingent Consideration, Potential Cash Payment				$ 0.3
Business Acquisition, Cost of Acquired Entity, Cash Paid, Payment 1				$ 2.3
Business Combination, Contingent Consideration Arrangements, Number of Annual Payments \| payment				3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles				$ 1.7
Goodwill				$ 2.1
Business Combination, Cost of Acquired Entity, Number of Payments \| payment				2
Business Acquisition, Cost of Acquired Entity, Total of Payments 2 and 3				$ 1.4
Business Combination, Consideration, Including Contingent Consideration				6.4
Business Acquisition, Cost of Acquired Entity, Cash Paid, Payment 4				0.3
Hudson Capital Asset Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred															$ 1.0
Arabian Commodities Limited [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred														$ 7.1
RMI-RMC Acquistion [Member]
Business Acquisition [Line Items]
Goodwill							7.7
Hanley Group Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid, Payment 1					7.5						7.5
Business Combination, Contingent Consideration Arrangements, Number of Annual Payments \| payment						2
Goodwill						$ 18.7
Business Combination, Cost of Acquired Entity, Number of Payments \| payment						2
Business Acquisition, Cost of Acquired Entity, Total of Payments 2 and 3						$ 24.3
Business Combination, Consideration, Including Contingent Consideration						51.6
Business Acquisition, Cost of Acquired Entity, Cash Paid, Payment 4										6.3		6.3
Business Acquisition, Cost of Acquired Entity, Cash Paid, Payment 2										$ 18.2		$ 18.2
Business Acquisition, Cost of Acquired Entity, Cash Paid, Payment 3					6.1						6.1
Provident Group Asset Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred					$ 5.0						5.0
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Total Shares Purchased and Placed In Escrow \| shares					8,700					205,625		214,325
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Period From Date of Closing Over Which Shares Will be Released from Escrow					5 years
Business Combination, Bargain Purchase, Gain Recognized, Amount								$ 0.4
Customer Relationships [Member] \| Hencorp Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles				$ 1.3
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				20 years
Customer Relationships [Member] \| RMI-RMC Acquistion [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles							$ 7.0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life							20 years
Customer Relationships [Member] \| Hanley Group Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles						$ 0.2
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life						5 years
Customer Relationships [Member] \| Provident Group Asset Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles					$ 0.2						0.2
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					2 years
Software Programs and Platforms [Member] \| RMI-RMC Acquistion [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles							$ 0.8
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life							5 years
Software Programs and Platforms [Member] \| Hanley Group Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles						$ 1.2
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life						5 years
Noncompete Agreements [Member] \| Hencorp Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles				$ 0.4
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				2 years
Noncompete Agreements [Member] \| Hanley Group Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles						$ 2.9
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life						3 years
Trade Names [Member] \| Hencorp Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles Not Amortizable				$ 0.8			$ 1.2
Trade Names [Member] \| Hanley Group Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles Not Amortizable						$ 0.1
Trade Names [Member] \| Provident Group Asset Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles Not Amortizable					$ 0.2						$ 0.2
Restricted Stock [Member] \| Hanley Group Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Maximum Percent of Final Contingent Payment to be Paid in Stock						30.00%
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Option, Exercise Period, Number of Days Commencing on June 30, 2013						20 days
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Option, Price Per Share \| $ / shares						$ 16
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Option, Price Per Share, Percent of Fair Value of Common Stock on June 20, 2013						75.00%
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Option, Maximum Number of Shares Issuable Upon Exercise \| shares						187,500
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Option, Stock Restriction Lapse Period						3 years

Discontinued Operations Discontinued Operations (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jan. 03, 2010	Jun. 30, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Jan. 01, 2010	Dec. 31, 2009
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Method Investment, Ownership Percentage					55.00%
Asset Impairment Charges			$ 0.0	$ 0.0	$ 1.1
Agora-X, LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Method Investment, Ownership Percentage							80.00%
Controlling Interest Sold	65.00%
Proceeds from Noncontrolling Interests			$ 6.6
Noncontrolling Interest, Ownership Percentage by Parent						15.00%
Asset Impairment Charges		$ 0.5
Gain (Loss) on Sale of Business				$ 0.2	1.9
Gain (Loss) On Sale Of Business, Net of Tax					1.3
INTL Capital Limited [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale of Business					$ (0.7)

Quarterly Financial Information Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Quarterly Financial Information Disclosure [Abstract]
Total Revenues	$ 17,668.1	$ 17,351.1	$ 16,951.0	$ 17,290.4	$ 24,070.4	$ 20,573.4	$ 14,583.0	$ 16,270.8	$ 69,260.6	$ 75,497.6	$ 46,940.3
Cost of sales of physical commodities	17,550.1	17,227.3	16,831.4	17,194.1	23,962.3	20,468.0	14,470.0	16,174.1	68,802.9	75,074.4	46,671.3
Operating revenues	118.0	123.8	119.6	96.3	108.1	105.4	113.0	96.7	457.7	423.2	269.0
Interest expense	3.3	2.6	3.6	2.1	2.2	2.0	3.3	3.8	11.6	11.3	9.9
Net revenues	114.7	121.2	116.0	94.2	105.9	103.4	109.7	92.9	446.1	411.9	259.1
Total non-interest expenses	104.2	115.3	112.4	94.9	92.9	86.1	86.4	87.0	426.8	352.4	241.2
Income from continuing operations, before tax	10.5	5.9	3.6	(0.7)	13.0	17.3	23.3	5.9	19.3	59.5	17.9
Income tax expense	2.2	1.2	1.2	(0.2)	5.4	7.0	8.0	2.1	4.4	22.5	6.4
Net income from continuing operations	8.3	4.7	2.4	(0.5)	7.6	10.3	15.3	3.8	14.9	37.0	11.5
Income from discontinued operations					0.0	0.0	0.0	(0.2)	0.0	0.2	0.6
Net income					7.6	10.3	15.3	4.0	14.9	37.2	5.1
Add: Net loss attributable to noncontrolling interests	0.0	0.0	0.0	0.1	0.1	(0.1)	(0.1)	0.0	0.1	0.1	0.3
Net income attributable to INTL FCStone Inc. common stockholders	$ 8.3	$ 4.7	$ 2.4	$ (0.4)	$ 7.5	$ 10.4	$ 15.4	$ 4.0	$ 15.0	$ 37.3	$ 5.4
Net basic earnings per share	$ 0.44	$ 0.24	$ 0.13	$ (0.02)	$ 0.41	$ 0.58	$ 0.87	$ 0.23	$ 0.79	$ 2.07	$ 0.31
Net diluted earnings per share	$ 0.42	$ 0.23	$ 0.12	$ (0.02)	$ 0.39	$ 0.55	$ 0.81	$ 0.22	$ 0.75	$ 1.96	$ 0.30

Segment and Geographic Information - Reportable Segments (Details)	12 Months Ended
	Sep. 30, 2012 consultant segment
Segment Analysis [Abstract]
Number of Reportable Segments \| segment	5
Number of Consultants \| consultant	188
Number of different types of foreign currencies	130

Segment and Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting Information [Line Items]
Revenues	$ 17,668.1	$ 17,351.1	$ 16,951.0	$ 17,290.4	$ 24,070.4	$ 20,573.4	$ 14,583.0	$ 16,270.8	$ 69,260.6	$ 75,497.6	$ 46,940.3
Gross Profit	118.0	123.8	119.6	96.3	108.1	105.4	113.0	96.7	457.7	423.2	269.0
Net Contribution									228.7	229.5	128.1
Net Segment Income									110.1	133.9	65.0
Costs not allocated									90.8	74.4	47.1
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	10.5	$ 5.9	$ 3.6	$ (0.7)	13.0	$ 17.3	$ 23.3	$ 5.9	19.3	59.5	17.9
Assets	2,958.9				2,635.7				2,958.9	2,635.7
Commodity and Risk Management [Member]
Segment Reporting Information [Line Items]
Revenues									68,928.3	75,274.1	46,785.2
Gross Profit									246.0	252.6	129.8
Net Contribution									143.0	151.6	70.9
Net Segment Income									69.7	93.5	32.8
Assets	1,449.2				1,540.8				1,449.2	1,540.8
Foreign Exchange Segment [Member]
Segment Reporting Information [Line Items]
Revenues									62.6	59.3	47.5
Gross Profit									62.6	59.3	47.5
Net Contribution									41.3	37.1	28.0
Net Segment Income									28.3	28.0	21.8
Assets	124.5				146.1				124.5	146.1
Securities Segment [Member]
Segment Reporting Information [Line Items]
Revenues									39.9	30.5	20.8
Gross Profit									39.9	30.5	20.8
Net Contribution									19.8	16.5	11.4
Net Segment Income									4.5	1.9	5.6
Assets	88.7				104.8				88.7	104.8
Clearing and Execution Services Segment [Member]
Segment Reporting Information [Line Items]
Revenues									93.8	66.1	61.8
Gross Profit									93.8	66.1	61.8
Net Contribution									14.3	14.3	10.7
Net Segment Income									2.2	4.9	1.1
Assets	1,090.9				734.4				1,090.9	734.4
Other Segment [Member]
Segment Reporting Information [Line Items]
Revenues									136.2	67.2	24.8
Gross Profit									15.6	14.3	8.9
Net Contribution									10.3	10.0	7.1
Net Segment Income									5.4	5.6	3.7
Assets	110.8				43.4				110.8	43.4
Corporate [Member]
Segment Reporting Information [Line Items]
Revenues									(0.2)	0.4	0.2
Gross Profit									(0.2)	0.4	$ 0.2
Assets	$ 94.8				$ 66.2				$ 94.8	$ 66.2

Segment and Geographic Information Total Revenues by Geographic Location (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Revenues	$ 17,668.1	$ 17,351.1	$ 16,951.0	$ 17,290.4	$ 24,070.4	$ 20,573.4	$ 14,583.0	$ 16,270.8	$ 69,260.6	$ 75,497.6	$ 46,940.3
Gross Profit	118.0	$ 123.8	$ 119.6	$ 96.3	108.1	$ 105.4	$ 113.0	$ 96.7	457.7	423.2	269.0
Long-Lived Assets	18.9				15.0				18.9	15.0
UNITED STATES
Revenues									55,564.8	53,660.2	31,962.7
Gross Profit									297.3	302.1	213.4
Long-Lived Assets	11.5				10.7				11.5	10.7
Europe [Member]
Revenues									69.9	35.1	20.4
Gross Profit									69.9	35.1	20.4
Long-Lived Assets	3.8				2.0				3.8	2.0
South America [Member]
Revenues									58.2	53.3	17.8
Gross Profit									58.2	53.3	17.8
Long-Lived Assets	2.8				1.6				2.8	1.6
Asia [Member]
Revenues									13,555.3	21,738.4	14,926.6
Gross Profit									19.9	27.6	14.4
Long-Lived Assets	0.7				0.6				0.7	0.6
Other (geographic location) [Member]
Revenues									12.4	10.6	12.8
Gross Profit									12.4	5.1	$ 3.0
Long-Lived Assets	$ 0.1				$ 0.1				$ 0.1	$ 0.1

Condensed Parent Only Financial Statements [Schedule] Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Cash and cash equivalents	$ 236.3	$ 220.6	$ 81.9	$ 60.5
Income taxes receivable	11.9	8.8
Financial instruments, owned, at fair value	171.7	223.1
Deferred income taxes	19.9	20.7
Property and equipment, net	18.9	15.0
Goodwill and intangible assets, net	54.7	56.1
Total assets	2,958.9	2,635.7
Liabilities:
Accounts payable and other accrued liabilities	127.0	122.0
Payables to Customers	2,072.3	1,739.8
Payables to lenders under loans	218.2	77.4
Financial Instruments Sold, Not yet Purchased, at Fair Value	175.4	390.9
Total liabilities	2,639.8	2,338.1
INTL FCStone Inc. (Parent Company Only) stockholders’ equity:
Common stock, $.01 par value. Authorized 30,000,000 shares; 19,214,219 issued and 18,984,951 outstanding at September 30, 2012 and 18,653,964 issued and 18,642,407 outstanding at September 30, 2011	0.2	0.2
Common stock in treasury, at cost - 229,064 shares at September 30, 2012 and 11,557 shares at September 30, 2011	4.1	0.1
Additional Paid in Capital	213.2	205.2
Retained earnings	112.0	97.0
Accumulated other comprehensive loss	(2.2)	(6.0)
Total INTL FCStone Inc. (Parent Company Only) stockholders’ equity	319.1	296.3
Total liabilities and equity	2,958.9	2,635.7
Parent Company [Member]
Cash and cash equivalents	13.1	2.0	$ 0.4	$ 0.0
Receivables from subsidiaries	20.1	43.9
Notes receivable, net	10.2	0.0
Income taxes receivable	14.3	21.4
Financial instruments, owned, at fair value	1.5	3.2
Investment in subsidiaries	220.1	207.9
Deferred income taxes	0.9	0.8
Property and equipment, net	4.3	2.6
Goodwill and intangible assets, net	0.0	0.3
Other assets	3.4	3.5
Total assets	287.9	285.6
Adjustment to Investment in Subs for Equity Method Accounting	111.6	81.8
Adjustment to Retained Earnings for Equity Method	111.6	81.8
Liabilities:
Accounts payable and other accrued liabilities	4.2	6.4
Payables to Customers	0.7	0.0
Payables to lenders under loans	48.0	0.0
Financial Instruments Sold, Not yet Purchased, at Fair Value	25.3	58.7
Total liabilities	78.2	65.1
INTL FCStone Inc. (Parent Company Only) stockholders’ equity:
Preferred stock, $.01 par value. Authorized 1,000,000 shares; no shares issued or outstanding	0.0	0.0
Common stock, $.01 par value. Authorized 30,000,000 shares; 19,214,219 issued and 18,984,951 outstanding at September 30, 2012 and 18,653,964 issued and 18,642,407 outstanding at September 30, 2011	0.2	0.2
Common stock in treasury, at cost - 229,064 shares at September 30, 2012 and 11,557 shares at September 30, 2011	(4.1)	(0.1)
Additional Paid in Capital	213.2	205.0
Retained earnings	0.4	15.4
Total INTL FCStone Inc. (Parent Company Only) stockholders’ equity	209.7	220.5
Total liabilities and equity	$ 287.9	$ 285.6

Condensed Parent Only Financial Statements [Schedule] Income Statement (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Condensed Financial Statements, Captions [Line Items]
Trading gains, net									$ 248.4	$ 205.7	$ 86.5
Commission and clearing fees									161.0	134.5	119.9
Interest income									10.3	10.3	7.0
Other Income									0.5	1.0	0.5
Gross Profit	$ 118.0	$ 123.8	$ 119.6	$ 96.3	$ 108.1	$ 105.4	$ 113.0	$ 96.7	457.7	423.2	269.0
Interest expense	3.3	2.6	3.6	2.1	2.2	2.0	3.3	3.8	11.6	11.3	9.9
Net revenues	114.7	121.2	116.0	94.2	105.9	103.4	109.7	92.9	446.1	411.9	259.1
Noninterest Expense [Abstract]
Compensation and benefits									202.4	176.6	104.2
Clearing and related expenses									107.2	77.4	68.2
Introducing broker commissions									31.0	24.0	18.9
Communication and data services									22.6	15.5	11.1
Occupancy and equipment rental									11.0	8.9	6.2
Professional Fees									12.9	10.6	8.1
Depreciation and amortization									7.2	4.7	1.6
Bad debts and impairments									1.5	6.2	5.8
Other									31.0	28.5	17.1
Total non-interest expenses	104.2	115.3	112.4	94.9	92.9	86.1	86.4	87.0	426.8	352.4	241.2
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	10.5	5.9	3.6	(0.7)	13.0	17.3	23.3	5.9	19.3	59.5	17.9
Income tax benefit	2.2	1.2	1.2	(0.2)	5.4	7.0	8.0	2.1	4.4	22.5	6.4
Net Income (Loss) Attributable to Parent	$ 8.3	$ 4.7	$ 2.4	$ (0.4)	$ 7.5	$ 10.4	$ 15.4	$ 4.0	15.0	37.3	5.4
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Trading gains, net									7.1	3.1	2.5
Commission and clearing fees									0.0	0.0	0.9
Interest income									2.1	4.3	1.7
Other Income									0.3	0.4	13.9
Gross Profit									9.5	7.8	19.0
Interest expense									5.6	9.7	6.3
Net revenues									3.9	(1.9)	12.7
Noninterest Expense [Abstract]
Compensation and benefits									12.4	8.6	10.2
Clearing and related expenses									0.3	0.1	0.1
Introducing broker commissions									0.0	0.2	0.2
Communication and data services									0.6	0.5	0.5
Occupancy and equipment rental									1.0	1.2	0.8
Professional Fees									3.1	3.8	1.3
Depreciation and amortization									1.2	0.6	0.0
Bad debts and impairments									2.2	0.0	(1.1)
Other									6.8	(0.5)	3.1
Total non-interest expenses									27.6	14.5	15.1
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									(23.7)	(16.4)	(2.4)
Income tax benefit									9.2	6.4	5.7
Net Income (Loss) Attributable to Parent									(14.5)	(10.0)	3.3
Adjustment to Investment in Subs for Equity Method Accounting									$ 29.5	$ 47.3	$ 2.1

Condensed Parent Only Financial Statements [Schedule] Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Condensed Financial Statements, Captions [Line Items]
Net Income (Loss) Attributable to Parent	$ 8.3	$ 4.7	$ 2.4	$ (0.4)	$ 7.5	$ 10.4	$ 15.4	$ 4.0	$ 15.0	$ 37.3	$ 5.4
Depreciation, Depletion and Amortization, Nonproduction									7.2	4.7	1.7
Tangible Asset Impairment Charges									1.7	6.2	3.5
Deferred Income Tax Expense (Benefit)									(0.5)	1.8	1.2
Amortization of Financing Costs and Discounts									1.7	1.6	0.2
Convertible debt interest settled in company stock upon conversion									0.0	0.2	0.0
Share-based Compensation									5.9	2.3	1.9
Gain on acquisition of INTL Provident									0.0	(0.4)	0.0
Notes receivable, net									(77.9)	2.9	(7.0)
Income taxes receivable									(3.1)	0.6	35.4
Financial instruments owned, at fair value									58.3	280.7	(212.7)
Other assets									(1.6)	(12.1)	3.9
Increase (Decrease) in Accounts Payable and Accrued Liabilities									10.6	30.8	1.9
Increase (Decrease) in Payables to Customers									248.0	366.2	415.3
Increase (Decrease) in Financial Instruments Sold, Not yet Purchased									(215.5)	202.9	(46.7)
Net Cash Provided by (Used in) Operating Activities									(92.1)	209.0	113.0
Cash paid for other acquisitions, net									(11.7)	(9.3)	(37.6)
Payments to Acquire Property, Plant, and Equipment									(8.7)	(10.1)	(4.7)
Net Cash Provided by (Used in) Investing Activities									(20.0)	(21.5)	(42.4)
Net change in payable to lenders under loans									140.8	(37.5)	6.1
Share repurchase									(4.0)	0.0	0.0
Debt issuance costs									(0.3)	(2.4)	0.0
Exercise of stock options									1.9	1.4	0.7
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities									0.2	0.0	0.0
Net Cash Provided by (Used in) Financing Activities									129.0	(48.4)	(49.2)
Cash and Cash Equivalents, Period Increase (Decrease)									15.7	138.7	21.4
Cash and Cash Equivalents, at Carrying Value	236.3				220.6				236.3	220.6	81.9	$ 60.5
Cash paid for interest									7.9	9.5	7.4
Income taxes paid, net of cash refunds									6.1	17.6	(33.3)
Convertible note conversions										16.9
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net Income (Loss) Attributable to Parent									(14.5)	(10.0)	3.3
Depreciation, Depletion and Amortization, Nonproduction									1.2	0.6	0.0
Tangible Asset Impairment Charges									2.2	0.0	0.0
Deferred Income Tax Expense (Benefit)									(0.1)	1.1	(1.6)
Amortization of Financing Costs and Discounts									0.5	0.2	0.2
Convertible debt interest settled in company stock upon conversion									0.0	0.2	0.0
Share-based Compensation									5.9	2.3	1.9
Gain on acquisition of INTL Provident									0.0	(0.4)	0.0
Increase (Decrease) Due from Affiliates									21.7	35.7	(6.5)
Notes receivable, net									(10.2)	0.0	0.0
Income taxes receivable									7.1	(13.6)	(0.5)
Financial instruments owned, at fair value									1.7	(0.4)	(2.8)
Other assets									(0.3)	(0.8)	(0.3)
Increase (Decrease) in Accounts Payable and Accrued Liabilities									(2.2)	1.7	(1.3)
Increase (Decrease) in Payables to Customers									0.7	0.0	0.0
Increase (Decrease) in Financial Instruments Sold, Not yet Purchased									(33.4)	(0.5)	37.1
Net Cash Provided by (Used in) Operating Activities									(19.7)	16.1	28.4
Cash paid for other acquisitions, net									0.0	0.0	(5.0)
Payments for Advance to Affiliate									(12.5)	(1.0)	(0.7)
Payments to Acquire Property, Plant, and Equipment									(2.7)	(1.7)	0.0
Net Cash Provided by (Used in) Investing Activities									(15.2)	(2.7)	(5.7)
Net change in payable to lenders under loans									48.0	(11.9)	(23.0)
Share repurchase									(4.0)	0.0	0.0
Debt issuance costs									(0.1)	(1.2)	0.0
Exercise of stock options									1.9	1.3	0.7
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities									0.2	0.0	0.0
Net Cash Provided by (Used in) Financing Activities									46.0	(11.8)	(22.3)
Cash and Cash Equivalents, Period Increase (Decrease)									11.1	1.6	0.4
Cash and Cash Equivalents, at Carrying Value	$ 13.1				$ 2.0				13.1	2.0	0.4	$ 0.0
Cash paid for interest									2.1	3.0	3.8
Income taxes paid, net of cash refunds									0.1	10.8	(1.7)
Convertible note conversions									$ 0.0	$ 16.7	$ 0.0