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DEI Document - shares	6 Months Ended
DEI Document - shares	Mar. 31, 2013	May 06, 2013
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-Q
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		19,189,177
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
ASSETS
Cash and cash equivalents	$ 262.0	$ 236.3
Cash, securities and other assets segregated under federal and other regulations (including $43.9 and $72.8 at fair value at March 31, 2013 and September 30, 2012, respectively)	382.3	357.5
Deposits and receivables from:
Exchange-clearing organizations (including $1,460.4 and $1,510.0 at fair value at March 31, 2013 and September 30, 2012, respectively)	1,672.2	1,619.8
Broker-dealers, clearing organizations and counterparties (including $0.5 and $(0.7) at fair value at March 31, 2013 and September 30, 2012, respectively)	170.7	127.4
Receivables from customers, net	127.0	68.9
Notes receivable, net	78.8	104.0
Income taxes receivable	13.4	11.9
Financial Instruments, Owned, at Fair Value	176.0	171.7
Physical commodities inventory	152.0	131.6
Deferred income taxes	20.1	21.9
Property and equipment, net	18.8	18.9
Goodwill and intangible assets, net	56.8	54.7
Other assets	30.3	34.3
Total assets	3,160.4	2,958.9
Liabilities:
Accounts payable and other accrued liabilities (including $18.4 at fair value at March 31, 2013 and September 30, 2012)	126.0	127.0
Payables to:
Customers	2,234.3	2,072.3
Broker-dealers, clearing organizations and counterparties	2.6	39.4
Lenders under loans and overdrafts	226.0	218.2
Income taxes payable	4.9	5.5
Financial instruments sold, not yet purchased, at fair value	237.4	175.4
Deferred income taxes	0.0	2.0
Total liabilities	2,831.2	2,639.8
Commitments and contingencies (see 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; 19,507,582 issued and 19,168,770 outstanding at March 31, 2013 and 19,214,219 issued and 18,984,951 outstanding at September 30, 2012	0.2	0.2
Common stock in treasury, at cost - 339,082 shares at March 31, 2013 and 229,064 shares at September 30, 2012, respectively	(6.1)	(4.1)
Additional paid-in capital	216.9	213.2
Retained earnings	126.8	112.0
Accumulated other comprehensive loss	(8.6)	(2.2)
Total stockholders' equity	329.2	319.1
Total liabilities and equity	$ 3,160.4	$ 2,958.9

Condensed Consolidated Balance Sheets Parentheticals - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Balance Sheet Parentheticals [Abstract]
Securities and other assets segregated, fair value	$ 43.9	$ 72.8
Dep and rec -exch clear org - fair value	1,460.4	1,510.0
Dep and rec -b/d - fair value	0.5	(0.7)
Accounts pay and other accrued - fair value	$ 18.4	$ 14.8
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	19,507,852	19,214,219
Common stock - outstanding	19,168,770	18,984,951
Treasury stock - shares	339,082	229,064

Condensed Consolidated Income Statements Condensed Consolidated Income Statements - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Sales of physical commodities	$ 12,999.7	$ 16,861.6	$ 25,587.6	$ 34,037.5
Trading gains	58.9	38.0	138.8	111.4
Commission and clearing fees	43.4	41.5	83.4	73.5
Consulting and management fees	7.7	7.3	16.0	13.5
Interest income	3.1	2.3	6.4	5.0
Other income	0.3	0.3	0.4	0.5
Total revenues	13,113.1	16,951.0	25,832.6	34,241.4
Cost of sales of physical commodities	12,995.8	16,831.4	25,589.6	34,025.5
Operating revenues	117.3	119.6	243.0	215.9
Interest expense	2.9	3.6	6.4	5.7
Net revenues	114.4	116.0	236.6	210.2
Non-interest expenses:
Compensation and benefits	52.0	55.1	98.7	100.9
Clearing and related expenses	29.1	27.1	54.1	49.8
Introducing broker commissions	9.6	8.0	18.0	13.8
Communication and data services	5.8	5.6	11.1	10.2
Occupancy and equipment rental	3.2	2.7	6.1	5.5
Professional fees	3.5	3.6	7.2	6.3
Depreciation and amortization	2.3	1.9	4.1	3.4
Bad debts and impairments	(0.3)	(0.1)	0.1	0.0
Other	7.8	8.5	17.0	17.4
Total non-interest expenses	113.0	112.4	216.4	207.3
Income from continuing operations, before tax	1.4	3.6	20.2	2.9
Income tax expense	(0.1)	1.2	5.4	1.0
Net income (loss)	1.5	2.4	14.8	1.9
Add: Net loss attributable to noncontrolling interests	0.0	0.0	0.0	0.1
Net income attributable to INTL FCStone Inc. common stockholders	$ 1.5	$ 2.4	$ 14.8	$ 2.0
Basic earnings per share:
Net income attributable to INTL FCStone Inc. common stockholders	$ 0.08	$ 0.13	$ 0.78	$ 0.11
Diluted earnings per share:
Net income attributable to INTL FCStone Inc. common stockholders	$ 0.08	$ 0.12	$ 0.75	$ 0.10
Weighted-average number of common shares outstanding:
Basic	18,380,971	18,303,968	18,327,517	18,233,340
Diluted	18,834,592	19,187,360	18,821,799	19,167,927

Condensed Consolidated Statement of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Condensed Consolidated Statement of Other Comprehensive Income (Loss) [Abstract]
Net income	$ (1.5)	$ (2.4)	$ (14.8)	$ (1.9)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax	(0.3)	(0.1)	(0.6)	(0.2)
Pension liabilities adjustment, net of tax	0.0	0.0	0.4	0.1
Net unrealized loss on available-for-sale securities, net of tax	0.4	0.3	0.2	0.2
Reclassification of adjustment for gains included in net income [Abstract]
Foreign currency transaction adjustment (included in other income)	(0.1)	0.0	(0.1)	0.0
Realized gain on available-for-sale securities (included in trading gains, net)	0.0	0.0	(8.3)	0.0
Income tax expense from reclassification adjustments (included in income tax expense)	0.0	0.0	2.0	0.0
Reclassification adjustment for gains included in net income	(0.1)	0.0	(6.4)	0.0
Other comprehensive loss	0.0	0.2	(6.4)	0.1
Comprehensive income (loss)	$ 1.5	$ 2.6	$ 8.4	$ 2.0

Condensed Consolidated Cash Flows Statements Condensed Consolidated Cash Flows Statements - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 14.8	$ 1.9
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	4.1	3.4
Provision for bad debts and impairments	0.1	0.0
Deferred income taxes	(0.3)	(0.5)
Amortization of debt issuance costs and debt discount	0.6	0.8
Amortization of stock-based compensation expense	3.5	2.3
Gain on sale of exchange memberships and common stock	(9.2)	0.0
Changes in operating assets and liabilities, net:
Cash, securities and other assets segregated under federal and other regulations	(24.9)	(316.2)
Deposits and receivables from exchange-clearing organizations	(52.4)	313.3
Deposits and receivables from broker-dealers, clearing organizations, and counterparties	(43.4)	19.2
Receivable from customers, net	(58.1)	(42.2)
Notes receivable from customers, net	25.2	8.4
Income taxes receivable	(1.5)	0.5
Financial instruments owned, at fair value	(12.6)	23.2
Physical commodities inventory	(20.4)	55.7
Other assets	3.1	6.5
Accounts payable and other accrued liabilities	(3.2)	4.2
Payable to customers	162.1	(56.3)
Payable to broker-dealers, clearing organizations and counterparties	(36.8)	(0.5)
Income taxes payable	1.4	(2.8)
Financial instruments sold, not yet purchased, at fair value	62.0	(170.5)
Net cash provided by (used in) operating activities	14.1	(149.6)
Cash flows from investing activities:
Deconsolidation of affiliates	0.0	0.4
Cash paid for other acquisitions, net	0.0	(1.3)
Sale of exchange memberships and common stock	10.2	0.0
Purchase of property and equipment	(3.1)	(5.8)
Net cash provided by (used in) investing activities	7.1	(6.7)
Cash flows from financing activities:
Net change in payable to lenders under loans and overdrafts	7.7	117.0
Payments related to earn-outs on acquisitions	(0.3)	(0.3)
Debt issuance costs	(0.2)	0.0
Exercise of stock options	0.5	1.5
Share repurchase	(2.2)	0.0
Tax shortfall on stock options and awards	(0.3)	0.0
Net cash provided by financing activities	5.2	118.2
Effect of exchange rates on cash and cash equivalents	(0.7)	(0.2)
Net increase (decrease) in cash and cash equivalents	25.7	(38.3)
Cash and cash equivalents at beginning of period	236.3	220.6
Cash and cash equivalents at end of period	262.0	182.3
Supplemental disclosure of cash flow information:
Cash paid for interest	4.7	4.0
Income taxes paid, net of cash refunds	6.0	3.5
Supplemental disclosure of non-cash investing and financing activities:
Identified intangible assets and goodwill on acquisitions	3.1	0.7
Additional consideration payable related to acquisitions	$ 3.9	$ 1.4

Condensed Consolidated Statement of Stockholders’ Equity Condensed Consolidated Statement of Stockholders' Equity - 6 months ended Mar. 31, 2013 - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Balances at beginning of period at Sep. 30, 2012	$ 319.1	$ 0.2	$ (4.1)	$ 213.2	$ 112.0	$ (2.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14.8
Other comprehensive loss	(6.4)					(6.4)
Proceeds from Stock Options Excercised (including income tax benefit)	0.2			0.2
Stock-based Compensation	3.5			3.5
Repurchase of stock	(2.0)		(2.0)
Balances at end of period at Mar. 31, 2013	$ 329.2	$ 0.2	$ (6.1)	$ 216.9	$ 126.8	$ (8.6)

- Definition

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

+ References

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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 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A91
-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 123R
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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 consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
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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 6: 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.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
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-Publisher AICPA
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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

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References + Details

Basis of Presentation and Consolidation	6 Months Ended
Basis of Presentation and Consolidation	Mar. 31, 2013
Basis of Presentation and Consolidation and Recently Issued Accounting Standards [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Basis of Presentation and Consolidation and Recently Issued Accounting Standards 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 and Consolidation The accompanying condensed consolidated balance sheet as of September 30, 2012, which has been derived from audited financial statements, and the unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). Certain information and note disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") have been condensed or omitted pursuant to those rules and regulations. The Company believes that the disclosures made are adequate to make the information presented not misleading. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the condensed consolidated financial statements for the interim periods presented have been reflected as required by Rule 10-01 of Regulation S-X. Operating results for interim periods are not necessarily indicative of the results that may be expected for the full year. It is suggested that these interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related notes contained in the Company’s Form 10-K for the fiscal year ended September 30, 2012 filed with the SEC. These condensed 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. The Company's fiscal year end is September 30, and the fiscal quarters end on December 31, March 31, June 30 and September 30. Unless otherwise stated, all dates refer to fiscal years and fiscal interim periods. The preparation of condensed consolidated financial statements in conformity with 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. Although these and other estimates and assumptions are based on the best available information, actual results could be materially different from these estimates. Recent Accounting Pronouncements On December 16, 2011, the Financial Accounting Standards Board ("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 on or 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 expects 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 its condensed 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 adopted this guidance and it did not have a material impact on the Company's condensed consolidated financial statements. In February 2013, the FASB issued Accounting Standards Update ("ASU") No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income requiring new disclosures regarding reclassification adjustments from accumulated other comprehensive income ("AOCI"). ASU No. 2013-02 requires disclosure of amounts reclassified out of AOCI by component. In addition, the entity is required to present, either on the face of the statement where net income is presented or the notes, significant amounts reclassified out of AOCI by the respective line items of net income. The Company expects to adopt this guidance starting with the first quarter of fiscal year 2014. The adoption of this guidance is not expected to have a material impact on the Company's condensed consolidated financial statements.

Earnings per Share

6 Months Ended

Mar. 31, 2013

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.



	Three Months Ended March 31,						Six Months Ended March 31,
(in millions, except share amounts)	2013			2012			2013			2012
Numerator:
Income from operations attributable to INTL FCStone Inc. stockholders	$	1.5		$	2.4		$	14.8		$	2.0
Less: Allocation to participating securities	(0.1		)	(0.1		)	(0.6		)	(0.1		)
Income from operations allocated to common stockholders	$	1.4		$	2.3		$	14.2		$	1.9
Diluted net income	$	1.5		$	2.4		$	14.8		$	2.0
Less: Allocation to participating securities	(0.1		)	(0.1		)	(0.6		)	(0.1		)
Diluted net income allocated to common stockholders	$	1.4		$	2.3		$	14.2		$	1.9
Denominator:
Weighted average number of:
Common shares outstanding	18,380,971			18,303,968			18,327,517			18,233,340
Dilutive potential common shares outstanding:
Share-based awards	453,621			883,392			494,282			934,587
Diluted weighted-average shares	18,834,592			19,187,360			18,821,799			19,167,927

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 Accounting Standards Codification ("ASC").

Options to purchase 1,490,288 shares of common stock for the three and six months ended March 31, 2013, respectively, and options to purchase 1,190,859 shares of common stock for the three and six months ended March 31, 2012, 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)

6 Months Ended

Mar. 31, 2013

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 condensed 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

The majority of financial assets and liabilities on the condensed consolidated balance sheets are reported at fair value. Cash is reported at the balance held at financial institutions. Cash equivalents include 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 and mutual 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. Payable to lenders carry variable rates of interest and thus approximate fair value.

The fair value estimates presented in the condensed consolidated financial statements are based on pertinent information available to management as of March 31, 2013 and September 30, 2012. 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 condensed consolidated financial statements since that date and current estimates of fair value may differ significantly from the amounts presented in the condensed consolidated financial statements.

Cash equivalents, securities, commodities warehouse receipts, derivative financial instruments, commodities leases, exchange common stock 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 six months ended March 31, 2013. 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 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; 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).

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 March 31, 2013 and September 30, 2012 by level within the fair value hierarchy.



	March 31, 2013
(in millions)	Level 1		Level 2		Level 3		Netting and Collateral (1)			Total
Assets:
Money market funds	$	0.1	$	—	$	—	$	—		$	0.1
Certificate of deposits	2.7		—		—		—			2.7
Unrestricted cash equivalents	2.8		—		—		—			2.8
Commodities warehouse receipts	20.9		—		—		—			20.9
U.S. government obligations	—		23.0		—		—			23.0
Securities and other assets segregated under federal and other regulations	20.9		23.0		—		—			43.9
Money market funds	572.2		—		—		—			572.2
U.S. government obligations	—		901.8		—		—			901.8
Mortgage-backed securities	—		6.1		—		—			6.1
Derivatives	1,936.2		74.4		—		(2,030.3		)	(19.7		)
Deposits and receivables from exchange-clearing organizations	2,508.4		982.3		—		(2,030.3		)	1,460.4
Deposits and receivables from broker-dealers, clearing organizations and counterparties - derivatives	0.6		—		—		(0.1		)	0.5
Common and preferred stock and American Depositary Receipts ("ADRs")	45.7		30.5		0.9		—			77.1
Exchangeable foreign ordinary equities and ADRs	18.3		—		—		—			18.3
Corporate and municipal bonds	—		—		3.8		—			3.8
U.S. government obligations	—		0.3		—		—			0.3
Foreign government obligations	9.8		—		—		—			9.8
Derivatives	225.2		387.5		—		(574.6		)	38.1
Commodities leases	—		59.7		—		(43.1		)	16.6
Commodities warehouse receipts	5.4		—		—		—			5.4
Exchange firm common stock	3.7		0.2		—		—			3.9
Mutual funds and other	2.7		—		—		—			2.7
Financial instruments owned	310.8		478.2		4.7		(617.7		)	176.0
Total assets at fair value	$	2,843.5	$	1,483.5	$	4.7	$	(2,648.1	)	$	1,683.6
Liabilities:
Accounts payable and other accrued liabilities - contingent liabilities	$	—	$	—	$	18.4	$	—		$	18.4
Payables to exchange-clearing organizations, broker-dealers and counterparties - derivatives	1,829.2		16.7		—		(1,845.9		)	—
Common and preferred stock and ADRs	67.3		16.8		—		—			84.1
Exchangeable foreign ordinary equities and ADRs	7.8		—		—		—			7.8
Derivatives	219.0		404.6		—		(584.2		)	39.4
Commodities leases	—		249.2		—		(143.1		)	106.1
Financial instruments sold, not yet purchased	294.1		670.6		—		(727.3		)	237.4
Total liabilities at fair value	$	2,123.3	$	687.3	$	18.4	$	(2,573.2	)	$	255.8


(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 is included in that level.



	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 exchange-clearing organizations, broker-dealers and counterparties - 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 is included in that level.

Realized and unrealized gains and losses are included within ‘trading gains, net’ in the condensed 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 March 31, 2013 and September 30, 2012 are summarized below:



(in millions)	March 31, 2013			September 30, 2012
Total level 3 assets	$	4.7		$	4.5
Level 3 assets for which the Company bears economic exposure	$	4.7		$	4.5
Total assets	$	3,160.4		$	2,958.9
Total financial assets at fair value	$	1,683.6		$	1,764.3
Total level 3 assets as a percentage of total assets	0.1		%	0.2		%
Level 3 assets for which the Company bears economic exposure as a percentage of total assets	0.1		%	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 three and six months ended March 31, 2013 and 2012, including a summary of unrealized gains (losses) during the respective periods on the Company’s level 3 financial assets and liabilities still held as of March 31, 2013.



	Level 3 Financial Assets and Financial Liabilities For the Three Months Ended March 31, 2013
(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 stock and ADRs	$	0.9	$	—	$	—	$	—	$	—	$	—	$	0.9
Corporate and municipal bonds	3.6		—		0.2		—		—		—		3.8
	$	4.5	$	—	$	0.2	$	—	$	—	$	—	$	4.7
Liabilities:
Contingent liabilities	$	17.9	$	—	$	0.5	$	—	$	—	$	—	$	18.4



	Level 3 Financial Assets and Financial Liabilities For the Six Months Ended March 31, 2013
(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 stock and ADRs	$	0.9	$	—	$	—	$	—	$	—		$	—	$	0.9
Corporate and municipal bonds	3.6		—		0.2		—		—			—		3.8
	$	4.5	$	—	$	0.2	$	—	$	—		$	—	$	4.7
Liabilities:
Contingent liabilities	$	14.8	$	—	$	0.8	$	3.1	$	(0.3	)	$	—	$	18.4



	Level 3 Financial Assets and Financial Liabilities For the Three Months Ended March 31, 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 stock and ADRs	$	1.1	$	—	$	—	$	—	$	—	$	—	$	1.1
Corporate and municipal bonds	3.5		—		0.1		—		—		—		3.6
Mutual funds and other	0.4		—		—		—		—		—		0.4
	$	5.0	$	—	$	0.1	$	—	$	—	$	—	$	5.1
Liabilities:
Contingent liabilities	$	22.9	$	—	$	0.4	$	—	$	—	$	—	$	23.3



	Level 3 Financial Assets and Financial Liabilities For the Six Months Ended March 31, 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 stock and ADRs	$	1.1	$	—	$	—	$	—	$	—		$	—	$	1.1
Corporate and municipal bonds	3.6		—		—		—		—			—		3.6
Mutual funds and other	0.4		—		—		—		—			—		0.4
	$	5.1	$	—	$	—	$	—	$	—		$	—	$	5.1
Liabilities:
Contingent liabilities	$	22.3	$	—	$	1.3	$	—	$	(0.3	)	$	—	$	23.3

In accordance with the Fair Value Measurements and Disclosures Topic of the ASC, the Company has estimated on a recurring basis each period the fair value of debentures issued by a single asset owning company of Suriwongse Hotel located in Chiang Mai, Thailand. 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. The Company estimates the fair value of its investment in these debentures by using a management-developed forecast, which is based on the income approach. The Company continues to evaluate the fair value of the debentures. There were no significant changes in the fair value of the debentures during the six months ended March 31, 2013 and 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 net 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 and there have been no significant changes in the discount rate environment. From the dates of acquisition to March 31, 2013, certain acquisitions have had changes in the estimates of undiscounted cash flows, based on actual performances fluctuating from estimates. During the three and six months ended March 31, 2013, the fair value of the contingent consideration increased $0.5 million and $0.8 million, respectively, with the corresponding amount classified as 'other expense' within the condensed 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.

On March 31, 2013, the commodities market experienced downward 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, derivative assets of $74.4 million and derivative liabilities of $16.7 million were classified as level 2 at March 31, 2013. Such derivative assets and liabilities were valued using quoted market prices, and as such, were classified as level 1 prior to March 31, 2013.

Except as described above, the Company did not have any additional significant transfers between level 1 and level 2 fair value measurements for the six months ended March 31, 2013 and 2012.

The Company has recorded unrealized gains, net of income tax expense, related to U.S. government obligations and corporate bonds classified as available-for-sale securities in other comprehensive income ("OCI") as of March 31, 2013.

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 March 31, 2013 and September 30, 2012:



March 31, 2013
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	$	852.3	$	0.1	$	—	$	852.4
Mortgage-backed securities	6.0		0.1		—		6.1
	$	858.3	$	0.2	$	—	$	858.5



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, were less than $0.1 million.

As of March 31, 2013 and September 30, 2012, investments in debt securities classified as available-for-sale ("AFS") mature as follows:



March 31, 2013
	Due in				Estimated Fair Value
(in millions)	Less than 1 year		1 year or more		Estimated Fair Value
U.S. government obligations	$	852.4	$	—	$	852.4
Mortgage-backed securities	—		6.1		6.1
	$	852.4	$	6.1	$	858.5



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

There were no sales of AFS securities, other than noted below, during the six months ended March 31, 2013 and 2012, and as a result, no realized gains or losses were recorded for the six months ended March 31, 2013 and 2012.

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 March 31, 2013, the cost and fair value of all the equity investments in exchange firms was $4.0 million, respectively.

In June 2012, the board of LME Holdings Limited ("LME Holdings"), the parent company of The London Metal Exchange ("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. In July 2012, the shareholders of LME Holdings approved the sale of LME Holdings to the Hong Kong Exchanges & Clearing Limited. In December 2012, the Company received proceeds of $8.6 million from the sale of its shares in the LME. The shares of the LME were previously held by the Company as available-for-sale and the unrealized gain for those shares was reflected in OCI. For the six months ended March 31, 2013, the Company reclassified the unrealized gain remaining in accumulated OCI of approximately $6.3 million, net of income tax expense of $2.0 million, into the current period earnings.

The Company recorded unrealized gains of $0.2 million, net of income tax expense of $0.1 million, for the six months ended March 31, 2013, in OCI related to the remaining equity investments in exchange firms as of March 31, 2013. 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 a temporary impairment.

In December 2012, the Company sold its exchange membership seats in the Board of Trade of Kansas City, Missouri, Inc. ("KCBT"), in connection with the acquisition of the KCBT by Chicago Mercantile Exchange ("CME"). The Company was required to hold these exchange membership seats for clearing purposes and, as a result, the associated KCBT shares were being held at cost on the condensed consolidated balance sheet. The Company received proceeds of $1.5 million and recognized a gain of $0.9 million before taxes, during the six months ended March 31, 2013, in connection with the sale of these seats.

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-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
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-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 159
-Paragraph 17-22, 27, 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.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-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 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 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.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-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.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-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)

6 Months Ended

Mar. 31, 2013

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 condensed consolidated financial statements as of March 31, 2013 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 March 31, 2013. The total of $237.4 million as of March 31, 2013 includes $39.4 million for derivative contracts, which represents a liability to the Company based on their fair values as of March 31, 2013.

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 consolidated 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, implemented in April 2010, 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 fair value of the financial instruments recorded within 'trading gains' in the condensed consolidated income statements. As of March 31, 2013, approximately $400 million in notional principal of interest rate swaps were outstanding with a weighted-average life of 3 months.

Listed below are the fair values of the Company's derivative assets and liabilities as of March 31, 2013 and September 30, 2012. Assets represent net unrealized gains and liabilities represent net unrealized losses.



	March 31, 2013						September 30, 2012
(in millions)	Assets ⁽¹⁾			Liabilities ⁽¹⁾			Assets ⁽¹⁾			Liabilities ⁽¹⁾
Derivative contracts not accounted for as hedges:
Exchange-traded commodity derivatives	$	1,999.8		$	1,813.3		$	3,325.6		$	3,565.3
OTC commodity derivatives	437.6			451.1			823.6			841.4
Exchange-traded foreign exchange derivatives	43.1			39.6			63.0			47.7
OTC foreign exchange derivatives ⁽²⁾	94.1			109.2			215.4			196.6
Exchange-traded interest rate derivatives	3.7			5.6			0.9			2.6
OTC interest rate derivatives	0.5			—			1.6			—
Equity index derivatives	45.1			50.7			20.8			22.0
Gross fair value of derivative contracts	2,623.9			2,469.5			4,450.9			4,675.6
Impact of netting and collateral	(2,605.0		)	(2,430.1		)	(4,548.1		)	(4,631.0		)
Total fair value included in ‘Deposits and receivables from exchange-clearing organizations’	$	(19.7	)				$	(150.4	)
Total fair value included in 'Deposits and receivables from broker-dealers, clearing organizations and counterparties'	$	0.5					$	(0.7	)
Total fair value included in ‘Financial instruments owned, at fair value’	$	38.1					$	53.9
Fair value included in ‘Financial instruments sold, not yet purchased, at fair value’				$	39.4					$	44.6


(1)	As of March 31, 2013 and September 30, 2012, the Company’s derivative contract volume for open positions were approximately 3.2 million and 4.1 million contracts, respectively.


(2)	In accordance with agreements with counterparties, the Company is allowed to periodically take advances against its open trade fair value. There were no advances against open trade fair value outstanding as of March 31, 2013 and September 30, 2012.

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 sophisticated option products, including combinations of buying and selling puts and calls. The Company mitigates its risk by offsetting the customer's transaction simultaneously with one of the Company's trading counterparties or 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 gains (losses) related to derivative financial instruments for the three and six months ended March 31, 2013 and 2012, in accordance with the Derivatives and Hedging Topic of the ASC. The gains (losses) set forth below are included within ‘trading gains, net’ in the condensed consolidated income statements.



	Three Months Ended March 31,					Six Months Ended March 31,
(in millions)	2013		2012			2013		2012
Commodities	$	10.8	$	(7.9	)	$	41.4	$	26.3
Foreign exchange	3.1		0.9			5.7		5.6
Interest rate	—		1.7			0.1		0.7
Net gains (losses) from derivative contracts	$	13.9	$	(5.3	)	$	47.2	$	32.6

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 March 31, 2013 and September 30, 2012 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 condensed 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

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+ Details

Receivables from customers and notes receivable, net (Notes)	6 Months Ended
	Mar. 31, 2013
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 $1.0 million and $0.9 million as of March 31, 2013 and September 30, 2012, respectively. The allowance for doubtful accounts related to notes receivable was $0.1 million as of March 31, 2013 and September 30, 2012, respectively. 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 $21.7 million and $10.2 million as of March 31, 2013 and September 30, 2012, respectively. See discussion of notes receivable related to commodity repurchase agreements in Note 10.

Physical Commodities Inventory

6 Months Ended

Mar. 31, 2013

Physical Commodities Inventory [Abstract]

Inventory Disclosure [Text Block]

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 cost method. Cost includes finished commodity or raw material and processing costs related to the purchase and processing of inventories. Commodities in process include commodities in the process of being recycled. As of March 31, 2013 and September 30, 2012, $97.0 million and $129.1 million, respectively, of physical commodities inventory served as collateral under one of the Company’s credit facilities, as detailed further in Note 9. The carrying values of the Company’s inventory as of March 31, 2013 and September 30, 2012 are shown below.



(in millions)	March 31, 2013		September 30, 2012
Commodities in process	$	0.5	$	13.6
Finished commodities	151.5		118.0
Physical commodities inventory	$	152.0	$	131.6

As a result of declining market prices for some commodities, the Company has recorded LCM adjustments for physical commodities inventory of $2.7 million and $0.4 million as of March 31, 2013 and September 30, 2012, respectively. The adjustments are included within 'cost of sales of physical commodities' in the condensed consolidated income statements.

Goodwill

6 Months Ended

Mar. 31, 2013

Goodwill [Abstract]

Goodwill Disclosure [Text Block]

Goodwill

The carrying value of goodwill by segment is as follows:



(in millions)	March 31, 2013		September 30, 2012
Commodity and Risk Management Services	$	32.0	$	32.0
Foreign Exchange	6.3		6.3
Securities	5.3		5.3
Goodwill	$	43.6	$	43.6

Intangible Assets

6 Months Ended

Mar. 31, 2013

Intangible Assets [Abstract]

Intangible Assets Disclosure [Text Block]

Intangible Assets

The gross and net carrying values of intangible assets as of the balance sheet dates, by major intangible asset class are as follows:



	March 31, 2013							September 30, 2012
(in millions)	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Intangible assets subject to amortization
Noncompete agreement	$	3.7	$	(3.5	)	$	0.2	$	3.7	$	(3.0	)	$	0.7
Trade name	0.7		(0.6		)	0.1		0.7		(0.5		)	0.2
Software programs/platforms	2.2		(1.2		)	1.0		2.2		(1.0		)	1.2
Customer base	12.7		(2.0		)	10.7		9.6		(1.8		)	7.8
	19.3		(7.3		)	12.0		16.2		(6.3		)	9.9
Intangible assets not subject to amortization
Trade name	1.2		—			1.2		1.2		—			1.2
Total intangible assets	$	20.5	$	(7.3	)	$	13.2	$	17.4	$	(6.3	)	$	11.1

Amortization expense related to intangible assets was $1.1 million and $1.2 million for the six months ended March 31, 2013 and 2012, respectively.

As of March 31, 2013, the estimated future amortization expense was as follows:



(in millions)
Fiscal 2013 (remaining six months)	$	1.7
Fiscal 2014	1.7
Fiscal 2015	1.4
Fiscal 2016	1.0
Fiscal 2017	1.0
Fiscal 2018 and thereafter	5.2
	$	12.0

Credit Facilities

6 Months Ended

Mar. 31, 2013

Credit Facilities [Abstract]

Debt Disclosure [Text Block]

Credit Facilities

The Company has four committed credit facilities under which the Company may borrow up to $355 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 current credit facilities consist of the following:

•

A three-year syndicated committed loan facility established on October 29, 2010. The facility was amended on March 28, 2013 to increase the maximum amount which the Company is entitled to borrow from $95 million to $105 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.

•

A revolving syndicated committed loan facility established on September 22, 2010. The facility was amended on April 30, 2013, to extend the expiration date until July 31, 2013, and to reduce the maximum amount which the Company’s subsidiary, INTL Commodities, Inc. ("INTL Commodities"), is entitled to borrow, from $140 million to $100 million, subject to certain conditions. The loan proceeds are used to finance the activities of INTL Commodities and are secured by its assets. The Company does not believe the decrease in the commitment amount will have a significant impact on the operations of the Company. 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 11, 2013, under which the Company's subsidiary, FCStone, LLC, may borrow up to $75 million. This line of credit is used to provide short term funding of required margin to commodity exchanges. This line of credit is subject to annual review, and the continued availability of this line of credit is subject to the financial condition and operating results of FCStone continuing to be satisfactory to the lenders. The facility is guaranteed by the Company.

•

A syndicated committed borrowing facility established on August 10, 2012 under which the Company’s subsidiary, FCStone Merchant Services, LLC ("FCStone Merchants"), is entitled to borrow up to $75 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. The facility is guaranteed by the Company.

The following table sets forth a listing of credit facilities, the committed amounts as of March 31, 2013 and outstanding borrowings as of March 31, 2013 and September 30, 2012:



(in millions)					Amounts Outstanding
Borrower	Security	Renewal / Expiration Date	Commitment⁽¹⁾		March 31, 2013		September 30, 2012
INTL FCStone Inc.	Certain pledged shares	October 1, 2013	$	105.0	$	72.0	$	48.0
INTL Commodities	Certain commodities assets	July 31, 2013	140.0		107.0		107.0
FCStone, LLC	None	April 10, 2014	75.0		—		20.0
FCStone Merchants	Certain commodities assets	May 31, 2013	75.0		47.0		43.2
			$	395.0	$	226.0	$	218.2

(1) The commitment under the INTL Commodities facility was reduced from $140 million to $100 million on April 30, 2013.

The majority of the Company’s committed credit facilities are scheduled to expire during fiscal 2013 or shortly thereafter. 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.

The Company’s facility agreements contain certain financial covenants relating to financial measures on a consolidated basis, as well as on a certain stand-alone subsidiary basis, including minimum net worth, minimum working capital, minimum regulatory capital, minimum net unencumbered liquid assets, minimum equity, minimum interest coverage and leverage ratios and maximum net loss. Failure to comply with any such covenants could result in the debt becoming payable on demand. As of March 31, 2013, the Company was in compliance with all of its covenants under its credit 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

Commodity and Other Repurchase Agreements (Notes)	6 Months Ended
Commodity and Other Repurchase Agreements (Notes)	Mar. 31, 2013
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 sale/repurchase agreements, under which 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 March 31, 2013 and September 30, 2012 were $54.7 million and $92.5 million, respectively. The obligations outstanding related to commodities sold under repurchase agreements that are recorded within 'broker-dealers, clearing organizations and counterparties' as of March 31, 2013 and September 30, 2012 were $0.0 million and $37.0 million, respectively. The obligations outstanding related to commodities sold under repurchase agreements that are recorded within 'lenders under loans' as of March 31, 2013 and September 30, 2012 were $47.0 million and $43.2 million, respectively.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Mar. 31, 2013
Commitments and Contingencies [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Commitments and Contingencies Legal and Regulatory Proceedings Certain conditions may exist as of the date that 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 and regulatory 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 and regulatory 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 and regulatory 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. As of March 31, 2013 and September 30, 2012, the condensed consolidated balance sheets include loss contingency accruals recorded prior to September 30, 2012 and during the six months ended March 31, 2013, which are not material, individually or in the aggregate, to the Company's financial position or liquidity. During the six months ended March 31, 2013, the Company recognized an expense accrual related to loss contingencies of $1.5 million. In the opinion of management, possible exposure from loss contingencies in excess of the amounts accrued, and in addition to the possible losses discussed below, is not likely to be material to the Company's earnings, financial position or liquidity. The following is a summary of significant legal matters involving the Company. Securities Litigation and Regulatory Proceedings 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 in July 2008. A consolidated amended complaint ("CAC") was subsequently filed in September 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 expected insurance coverage, and is subject to approval by the court. The terms of the settlement are expected to be presented to the court for approval on July 16, 2013. 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 energy trading account. In July 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. In July 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's 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 would result in the Company incurring a legal cost of $250,000 after consideration of expected insurance coverage, and is subject to approval by the court. The terms of the settlement are expected to be presented to the court for approval on July 16, 2013. In November 2011, the Commodity Futures Trading Commission ("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 2008 in the customer energy trading account of FCStone, LLC. In September 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 filed its Wells submission with the Staff in October 2012. The Company is in settlement discussions with the CFTC regarding this matter. 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. In January 2011, the trustee filed a motion for summary judgment on various counts in the adversary proceedings filed in August 2008 against FCStone, LLC and a number of other FCMs. In January 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. In April 2012, FCStone, LLC 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, as a test case, during October 2012. The trial court entered a judgment against FCStone, LLC on January 4, 2013. On January 17, 2013, the trial court entered an agreed order, staying execution and enforcement, pending an appeal of the judgment. By agreement, FCStone, LLC was required to post an appeal cash deposit of $8.0 million with the court, which was deposited on January 18, 2013. Based on the merits of the Company's appeal, management believes a loss is not probable, and thus has not recorded a provision for this matter. The Company believes that if the appeal is unsuccessful, the resulting pre-tax loss to FCStone, LLC would be in the range of $4 million and $6 million. 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 condensed consolidated balance sheets as of March 31, 2013 and September 30, 2012. 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 recorded an estimated contingent liability of $3.1 million, relating to the December 2012 acquisition of the accounts of Tradewire Securities, LLC, as described in Note 16. 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. 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. There was no significant change in fair value for the three and six months ended March 31, 2013. The present value of the estimated total purchase price, including contingent consideration, is less than $0.3 million as of March 31, 2013, of which less than $0.1 million has not been paid and is included within ‘accounts payable and other liabilities’ in the condensed consolidated balance sheet. 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, which may result in the payment of additional purchase price consideration. 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 third and fourth fiscal years following the closing of the acquisition and a discount rate being applied to those future payments. The change in fair value for the three and six months ended March 31, 2013 was an increase of $0.2 million, respectively, included within ‘other expense’ in the condensed consolidated income statements. The present value of the estimated total purchase price, including contingent consideration, is $6.7 million as of March 31, 2013, of which $2.5 million has not been paid and is included within ‘accounts payable and other liabilities’ in the condensed consolidated balance sheet. 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. 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 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. Based on the purchase agreement, the remaining additional consideration is limited to a maximum of $10.0 million. The change in fair value for the three and six months ended March 31, 2013 was an increase of $0.2 million and $0.4 million, respectively, included within ‘other expense’ in the condensed consolidated income statements. The present value of the estimated total purchase price, including contingent consideration, is $53.9 million as of March 31, 2013, of which $9.7 million has not been paid and is included within ‘accounts payable and other liabilities’ in the condensed consolidated balance sheet. The Company had a contingent liability relating to the April 2010 acquisition of the RMI Companies, subsequently reorganized as divisions of FCStone, LLC, which has resulted in the recognition of additional purchase price consideration. The final contingent liability adjustment recorded represents the fair value of the additional consideration to be paid in May 2013, based on the sales during the twelve-month period ended March 31, 2013. The change in fair value for the three and six months ended March 31, 2013 was an increase of $0.1 million, respectively, included within ‘other expense’ in the condensed consolidated income statements. The total purchase price, including contingent consideration, is $15.3 million, of which $3.1 million as of March 31, 2013 has not been paid and is included within ‘accounts payable and other liabilities’ in the condensed consolidated balance sheet. 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 condensed consolidated financial statements for these agreements and believes that any potential requirement to make payments under these agreements is remote.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

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-Name Accounting Standards Codification
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-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
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-Name Accounting Standards Codification
-Topic 440
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-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

Capital and Other Regulatory Requirements

6 Months Ended

Mar. 31, 2013

Capital and Other Regulatory Requirements [Abstract]

Regulatory Capital Requirements under Banking Regulations [Text Block]

Capital and Other Regulatory Requirements

The Company's activities are subject to significant governmental regulation, both in the United States and overseas. The subsidiaries of the Company were in compliance with all of their regulatory requirements as of March 31, 2013, as follows:



(in millions)			As of March 31, 2013
Subsidiary	Regulatory Authority	Requirement Type	Actual		Minimum Requirement
FCStone, LLC	CFTC	Net capital	$	108.1	$	70.8
FCStone, LLC	CFTC	Segregated funds	$	1,715.4	$	1,692.2
FCStone, LLC	CFTC	Secured funds	$	94.3	$	83.7
INTL FCStone Ltd	FSA	Net capital	$	50.6	$	23.1
INTL FCStone Ltd	FSA	Segregated funds	$	78.3	$	78.3
INTL Global Currencies Limited	FSA	Net capital	$	19.1	$	0.7
INTL FCStone Securities Inc.	SEC	Net capital	$	2.4	$	1.0
FCC Investments, Inc.	SEC	Net capital	$	0.3	$	0.3
FCStone Australia	Australian Securities and Investment Commission	Net capital	$	2.0	$	1.0
FCStone Australia	New Zealand Clearing Ltd	Capital adequacy	$	11.6	$	1.4
FCStone Commodity Services (Europe), Ltd.	Central Bank of Ireland	Net capital	$	1.9	$	0.6
INTL FCStone DTVM Ltda.	Brazilian Central Bank and Securities and Exchange Commission of Brazil	Capital adequacy	$	0.9	$	0.7

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 March 31, 2013, these subsidiaries were in compliance with their local capital adequacy requirements.

- 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
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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

Stock-Based Compensation

6 Months Ended

Mar. 31, 2013

Stock-Based Compensation [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 condensed consolidated income statements and totaled $1.9 million and $1.3 million for the three months ended March 31, 2013 and 2012, respectively, and $3.5 million and $2.3 million for the six months ended March 31, 2013 and 2012, respectively.

Stock Option Plan

The Company sponsored a stock option plan for its directors, officers, employees and consultants. The Company's Board of Directors approved a new stock option plan ("the 2013 Stock Option Plan"), which was approved by the shareholders at the 2013 annual meeting, and authorized the Company to issue stock options covering up to 1.0 million shares of the Company's common stock. As of March 31, 2013, there were 1.0 million shares authorized for future grant under this 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:



	Six Months Ended March 31, 2013
Expected stock price volatility	35	%
Expected dividend yield	—	%
Risk free interest rate	0.37	%
Average expected life (in years)	2.88

Expected stock price volatility rates are based primarily 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 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 the six months ended March 31, 2013 was $4.21.

The following is a summary of stock option activity for the six months ended March 31, 2013:



	Shares Available for Grant		Number of Options Outstanding		Weighted Average Price		Weighted Average Grant Date Fair Value		Weighted Average Remaining Term (in years)	Aggregate Intrinsic Value ($ millions)
Balances as of September 30, 2012	921,412		1,890,634		$	23.36	$	11.11	5.45	$	6.0
Expiration of 2003 Plan	(828,321	)
Additional shares authorized	1,000,000
Granted	(100,000	)	100,000		$	17.53	$	4.21
Exercised			(107,984	)	$	4.43	$	2.37
Forfeited	6,666		(16,998	)	$	7.58	$	3.54
Expired	243		(243	)	$	15.02	$	6.67
Balances as of March 31, 2013	1,000,000		1,865,409		$	24.29	$	11.31	5.18	$	3.5
Exercisable as of March 31, 2013			749,637		$	26.32	$	10.94	2.27	$	2.3

The total compensation cost not yet recognized for non-vested awards of $11.0 million as of March 31, 2013 has a weighted-average period of 6.14 years over which the compensation expense is expected to be recognized. Compensation expense is amortized on a straight-line basis over the vesting period. The total intrinsic value of options exercised during the six months ended March 31, 2013 and 2012 was $1.7 million, and $2.2 million, respectively.

Restricted Stock Plan

The Company sponsors a restricted stock plan for its directors, officers and employees. As of March 31, 2013, 1,218,953 shares were authorized for future grant under the 2012 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 March 31, 2013:



	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 as of September 30, 2012	1,420,114		512,124		$	22.09	1.81	$	9.8
Granted	(202,172	)	202,172		$	17.83
Vested			(196,066	)	$	21.15
Forfeited	1,011		(6,953	)	$	24.14
Balances as of March 31, 2013	1,218,953		511,277		$	20.74	2.16	$	8.9

The total compensation cost not yet recognized of $8.6 million as of March 31, 2013 has a weighted-average period of 2.16 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
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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

Other Expenses

6 Months Ended

Mar. 31, 2013

Other Expenses [Abstract]

Other Expenses [Text Block]

Other expenses for the three and six months ended March 31, 2013 and 2012 consisted of the following:



	Three Months Ended March 31,				Six Months Ended March 31,
(in millions)	2013		2012		2013		2012
Business development	$	2.2	$	3.1	$	5.2	$	6.3
Contingent consideration, net⁽¹⁾	0.5		0.9		1.2		2.2
Insurance	0.4		0.4		0.9		0.8
Advertising, meetings and conferences	0.7		0.5		1.1		1.1
Non-trading hardware and software maintenance and software licensing	1.0		0.8		1.6		1.4
Office supplies and printing	0.4		0.4		0.7		0.7
Other non-income taxes	1.1		1.2		2.2		1.9
Other	1.5		1.2		4.1		3.0
	$	7.8	$	8.5	$	17.0	$	17.4

(1)

For the three and six months ended March 31, 2013 and 2012, contingent consideration included 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). Also, for the six months ended March 31, 2013 and 2012, contingent consideration included additional purchase price, based on achieving specific conditions and earnings targets, relating to FCStone, LLC's previous acquisition of Globecot, Inc. ("Globecot"). The Globecot acquisition was recorded in accordance with SFAS No. 141, Business Combinations ("SFAS 141"). As a result of the Company's merger with FCStone Group, Inc. ("FCStone") on September 30, 2009, this contingent purchase price amount was considered a pre-acquisition contingency, which was 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.

Income Taxes	6 Months Ended
Income Taxes	Mar. 31, 2013
Income Taxes [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes In determining the quarterly provision for income taxes, management uses an estimated annual effective tax rate which is based on the expected annual income and statutory tax rates in the various jurisdictions in which it operates. The Company’s effective tax rate differs from the U.S. statutory rate primarily due to state and local taxes, and differing statutory tax rates applied to the income of non-U.S. subsidiaries. The Company records the tax effect of certain discrete items, including the effects of changes in tax laws, tax rates and adjustments with respect to valuation allowances or other unusual or nonrecurring tax adjustments, in the interim period in which they occur, as an addition to, or reduction from, the income tax provision, rather than being included in the estimated effective annual income tax rate. In addition, jurisdictions with a projected loss for the year or a year-to-date loss where no tax benefit can be recognized are excluded from the estimated annual effective income tax rate. The Company is required to assess its deferred tax assets and the need for a valuation allowance at each reporting period. This assessment requires judgment on the part of management with respect to benefits that may be realized. The Company will record a valuation allowance against deferred tax assets when it is considered more likely than not that all or a portion of our deferred tax assets will not be realized. The income tax (benefit) expense from operations of $(0.1) million and $1.2 million for the three months ended March 31, 2013 and 2012, respectively, and income tax expense from operations of $5.4 million and $1.0 million for the six months ended March 31, 2013 and 2012, respectively, reflect estimated federal, foreign and state taxes. During the three months ended March 31, 2013, the Company recorded a net decrease to its uncertain tax benefits of $0.4 million, attributed to favorably settled income tax audits, of which $0.3 million impacted the Company's effective tax rate. For the three months ended March 31, 2013, the Company’s effective tax rate was 0% compared to 33% for the three months ended March 31, 2012. For the six months ended March 31, 2013, the Company's effective tax rate was 27% compared to 34% for the six months ended March 31, 2012. The Company and its subsidiaries file income tax returns with the U.S. federal jurisdiction and various state and foreign jurisdictions. FCStone is a wholly-owned subsidiary acquired on September 30, 2009. Both INTL FCStone Inc. and FCStone are under federal and state examinations for various periods, ranging from August 31, 2008 through September 30, 2011.

- 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

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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
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+ Details

Acquisitions and Dispositions (Notes)	6 Months Ended
Acquisitions and Dispositions (Notes)	Mar. 31, 2013
Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	Acquisitions and Dispositions Tradewire Acquisition On December 12, 2012, the Company finalized an agreement to acquire certain institutional accounts from Tradewire Securities, LLC ("Tradewire Securities"), a Miami-based securities broker-dealer servicing customers throughout Latin America and a wholly-owned subsidiary of Tradewire Group Ltd. These accounts were transferred to INTL FCStone Inc.'s broker-dealer subsidiary, INTL FCStone Securities. Tradewire Securities provided global brokerage services to a wide range of customers, including hedge funds, pension funds, broker-dealers and banks located in Latin America, Caribbean, North America and Europe. Additionally, as part of the transaction, the Company hired more than 20 professional staff from Tradewire Securities' securities broker-dealer business based in Miami, Florida. The consideration to be paid for the acquisition of institutional accounts from Tradewire Securities consists of three annual contingent payments and a final contingent payment and is estimated to be $3.1 million as of March 31, 2013. The purchase price for the acquisition is not expected to be material to the condensed consolidated financial statements. 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, including but not limited to the calculation of the contingent consideration and valuation of separately identifiable intangible assets. These calculations and valuations of any identified intangible assets 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 may result in adjustments to separately identifiable intangible assets and goodwill. Any adjustments made to the valuations are not expected to be material. The intangible assets recognized in this transaction of $3.1 million were assigned to the Securities segment. Gletir Agente De Valores S.A. Disposition On February 28, 2013, the Company, through its subsidiaries INTL Netherlands B.V. and Gainvest Asset Management Ltda, entered into an agreement to sell all of its ownership interest in another subsidiary, Gletir Agente De Valores S.A. ("Gletir Agente"), to Gletir Financial Corp (the “Purchaser”). The Company sold the capital stock of Gletir Agente for $0.8 million. Gletir Agente had net assets of $0.6 million, which included $0.1 million of AOCI related to foreign currency translation, included in the consolidated condensed balance sheet of the Company, at the time of the sale. The gain resulting from the sale price less the carrying amount of the net assets and the gain from the AOCI balance were recorded as components of other income on the consolidated condensed income statement for the three and six months ended March 31, 2013. Planned Exit of Physical Base Metals Business During the quarter ended March 31, 2013, as a result of a change in management strategy within the Company's base metals product line, the Company received Board of Director approval to pursue an exit of its physical base metals business through either a potential sale or orderly liquidation of current open positions. The exit of the physical base metals business will include the sale or liquidation of certain base metals open contract positions and base metals inventory, and the transfer or elimination of the physical base metals trading team and certain operational support personnel. The Company believes the exit of the physical base metals business will be completed by the end of fiscal 2013. The physical base metals business is included in the C&RM Segment. The Company will continue to operate the portion of its base metals business related to non-physical assets. The Company has considered the impact of the exit of the physical base metals business on the Company's financial position, future operating results and liquidity, and believes the exit will not have a material impact to the condensed consolidated financial statements, expected cash flows or liquidity of the Company. The Company evaluated the recoverability of long-lived and intangible assets as a result of this planned exit, noting no impairment charges. At March 31, 2013, the Company has not incurred any costs associated with the exit of the physical base metals activities, including termination benefits, contract termination costs and other associated costs. The Company believes any additional exit costs will not be material to the condensed consolidated financial statements.

- 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).

+ References

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Reference 19: 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

Segment Analysis

6 Months Ended

Mar. 31, 2013

Segment Analysis [Abstract]

Segment Reporting Disclosure [Text Block]

The Company reports its operating segments based on services provided to customers. The Company’s activities are divided into the following 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 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 both precious and base metals, as well as certain other related commodities. This includes acting as a Category One ring dealing member of the LME, providing execution, clearing and advisory services in exchange traded futures and OTC products. 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’ in the condensed 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 and provides execution in select debt instruments and exchange-traded funds ("ETFs"). INTL Trading provides execution and liquidity to national broker-dealers, regional broker-dealers and institutional investors.

The Company makes markets in approximately 800 ADRs and foreign ordinary shares traded in the OTC market. In addition, the Company will, on request, make prices in more than 8,000 other ADRs and foreign common shares. As a market-maker, the Company provides trade execution services by offering to buy shares from, or sell shares to, broker-dealers and institutions. The Company displays the prices at which it is willing to buy and sell these securities and adjusts its prices in response to market conditions. When acting as principal, the Company commits its own capital and derives revenue from the difference between the prices at which the Company buys and sells shares. The Company also earns commissions by executing trades on an agency basis.

While the Company’s customers are other broker-dealers and institutions, the business tends to be driven by the needs of the private clients of those broker-dealers and institutions. The size of private client trades may be uneconomical for the in-house international equities trading desks of our customers to execute. The Company is able to provide execution of smaller trades at profitable margins.

The Company provides a full range of investment banking advisory services to commercial customers including the issuance of loans or equity. 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 condensed 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:



	Three Months Ended March 31,					Six Months Ended March 31,
(in millions)	2013			2012		2013			2012
Total revenues:
Commodity and Risk Management Services	$	13,002.9		$	16,872.7	$	25,622.7		$	34,074.7
Foreign Exchange	16.1			13.0		32.3			30.9
Securities	16.0			10.3		28.9			20.2
Clearing and Execution Services	25.3			25.4		47.7			43.1
Other	53.3			28.0		92.8			73.2
Corporate unallocated	(0.5		)	1.6		8.2			(0.7		)
Total	$	13,113.1		$	16,951.0	$	25,832.6		$	34,241.4
Operating revenues (loss):
Commodity and Risk Management Services	$	56.1		$	65.7	$	116.8		$	115.7
Foreign Exchange	16.1			13.0		32.3			30.9
Securities	16.0			10.3		28.9			20.2
Clearing and Execution Services	25.3			25.4		47.7			43.1
Other	4.3			3.6		9.1			6.7
Corporate unallocated	(0.5		)	1.6		8.2			(0.7		)
Total	$	117.3		$	119.6	$	243.0		$	215.9
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	$	31.2		$	37.0	$	71.7		$	66.8
Foreign Exchange	10.2			8.6		20.6			20.3
Securities	9.2			5.1		16.1			9.6
Clearing and Execution Services	3.6			3.8		7.2			6.3
Other	2.4			2.6		5.2			4.7
Total	$	56.6		$	57.1	$	120.8		$	107.7
Segment income (loss):
(Net contribution less non-variable direct segment costs):
Commodity and Risk Management Services	$	12.6		$	18.0	$	35.3		$	31.1
Foreign Exchange	6.9			5.2		14.0			14.2
Securities	4.2			0.8		7.4			1.9
Clearing and Execution Services	0.7			0.7		(0.2		)	0.6
Other	1.4			1.3		3.3			2.1
Total	$	25.8		$	26.0	$	59.8		$	49.9
Reconciliation of segment income to income from operations, before tax:
Segment income	$	25.8		$	26.0	$	59.8		$	49.9
Costs not allocated to operating segments	24.4			22.4		39.6			47.0
Income from operations, before tax	$	1.4		$	3.6	$	20.2		$	2.9

(in millions)	As of March 31, 2013			As of September 30, 2012
Total assets:
Commodity and Risk Management Services	$	1,511.3		$	1,449.2
Foreign Exchange	164.6			124.5
Securities	166.5			88.7
Clearing and Execution Services	1,119.9			1,090.9
Other	76.2			110.8
Corporate unallocated	121.9			94.8
Total	$	3,160.4		$	2,958.9

- 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.

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-Name Accounting Standards Codification
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-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 Subsequent Events (Notes)	6 Months Ended
Subsequent Events Subsequent Events (Notes)	Mar. 31, 2013
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Event On May 3, 2013, the Company reached an agreement in which First American Capital and Trading Corp. ("FACT"), has agreed to transfer its customer accounts to INTL FCStone Inc.'s broker-dealer subsidiary, INTL FCStone Securities Inc. Completion of this transaction is subject to certain conditions, including regulatory approval. FACT provides correspondent clearing services to institutional customers directly and through a global network of partners. With its experienced team, FACT services a wide range of customers, including broker-dealers, investment advisors, and fund managers.

Basis of Presentation and Consolidation Basis of Presentation and Consolidation (Policies)	6 Months Ended
	Mar. 31, 2013
Basis of Presentation and Consolidation [Abstract]
Basis of Accounting, Policy [Policy Text Block]	The accompanying condensed consolidated balance sheet as of September 30, 2012, which has been derived from audited financial statements, and the unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). Certain information and note disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") have been condensed or omitted pursuant to those rules and regulations. The Company believes that the disclosures made are adequate to make the information presented not misleading. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the condensed consolidated financial statements for the interim periods presented have been reflected as required by Rule 10-01 of Regulation S-X. Operating results for interim periods are not necessarily indicative of the results that may be expected for the full year. It is suggested that these interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related notes contained in the Company’s Form 10-K for the fiscal year ended September 30, 2012 filed with the SEC.
Consolidation, Policy [Policy Text Block]	These condensed 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.
Fiscal Period, Policy [Policy Text Block]	The Company's fiscal year end is September 30, and the fiscal quarters end on December 31, March 31, June 30 and September 30. Unless otherwise stated, all dates refer to fiscal years and fiscal interim periods.
Use of Estimates, Policy [Policy Text Block]	The preparation of condensed consolidated financial statements in conformity with 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. 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]	Recent Accounting Pronouncements On December 16, 2011, the Financial Accounting Standards Board ("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 on or 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 expects 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 its condensed 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 adopted this guidance and it did not have a material impact on the Company's condensed consolidated financial statements. In February 2013, the FASB issued Accounting Standards Update ("ASU") No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income requiring new disclosures regarding reclassification adjustments from accumulated other comprehensive income ("AOCI"). ASU No. 2013-02 requires disclosure of amounts reclassified out of AOCI by component. In addition, the entity is required to present, either on the face of the statement where net income is presented or the notes, significant amounts reclassified out of AOCI by the respective line items of net income. The Company expects to adopt this guidance starting with the first quarter of fiscal year 2014. The adoption of this guidance is not expected to have a material impact on the Company's condensed consolidated financial statements.

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 2
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Principles Board Opinion (APB)
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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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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Research Bulletin (ARB)
-Number 51
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph k
-Article 1

Reference 17: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 46
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Reference 18: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
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Reference 19: 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

- Definition

Disclosure of accounting policy for determining an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end is generally noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations are generally also disclosed.

+ References + Details

Earnings per Share Earnings per Share (Policies)	6 Months Ended
Earnings per Share Earnings per Share (Policies)	Mar. 31, 2013
Earnings Per Share [Abstract]
Earnings Per Share, Potentially Dilutive Securities	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 Accounting Standards Codification ("ASC").

- Definition

Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

+ References + Details

Receivables from customers and notes receivable, net (Policies)	6 Months Ended
	Mar. 31, 2013
Receivables from customers and notes receivable, net [Abstract]
Allowance for Receivables from Customers and Notes Receivables [Policy Text Block]	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.

Commitments and Contingencies Commitments and Contingencies (Policies)	6 Months Ended
	Mar. 31, 2013
Commitments and Contingencies [Abstract]
Commitments and Contingencies, Policy [Policy Text Block]	Certain conditions may exist as of the date that 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 and regulatory 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 and regulatory 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.

- Definition

Disclosure of accounting policy for commitments and contingencies, which may include policies for recognizing and measuring loss and gain contingencies.

+ 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

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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-Name Audit and Accounting Guide (AAG)
-Number AAG-HCO
-Paragraph 12, 13
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-Chapter 8
-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 Technical Bulletin (FTB)
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name FASB Interpretation (FIN)
-Number 45
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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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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 18: http://www.xbrl.org/2003/role/presentationRef
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Income Taxes Income Taxes (Policies)	6 Months Ended
Income Taxes Income Taxes (Policies)	Mar. 31, 2013
Income Taxes [Abstract]
Income Tax, Policy [Policy Text Block]	In determining the quarterly provision for income taxes, management uses an estimated annual effective tax rate which is based on the expected annual income and statutory tax rates in the various jurisdictions in which it operates. The Company’s effective tax rate differs from the U.S. statutory rate primarily due to state and local taxes, and differing statutory tax rates applied to the income of non-U.S. subsidiaries. The Company records the tax effect of certain discrete items, including the effects of changes in tax laws, tax rates and adjustments with respect to valuation allowances or other unusual or nonrecurring tax adjustments, in the interim period in which they occur, as an addition to, or reduction from, the income tax provision, rather than being included in the estimated effective annual income tax rate. In addition, jurisdictions with a projected loss for the year or a year-to-date loss where no tax benefit can be recognized are excluded from the estimated annual effective income tax rate. The Company is required to assess its deferred tax assets and the need for a valuation allowance at each reporting period. This assessment requires judgment on the part of management with respect to benefits that may be realized. The Company will record a valuation allowance against deferred tax assets when it is considered more likely than not that all or a portion of our deferred tax assets will not be realized.

- 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

+ Details

Earnings per Share Earnings per Share (Tables)

6 Months Ended

Mar. 31, 2013

Note 2 – Earnings per Share [Abstract]

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



	Three Months Ended March 31,						Six Months Ended March 31,
(in millions, except share amounts)	2013			2012			2013			2012
Numerator:
Income from operations attributable to INTL FCStone Inc. stockholders	$	1.5		$	2.4		$	14.8		$	2.0
Less: Allocation to participating securities	(0.1		)	(0.1		)	(0.6		)	(0.1		)
Income from operations allocated to common stockholders	$	1.4		$	2.3		$	14.2		$	1.9
Diluted net income	$	1.5		$	2.4		$	14.8		$	2.0
Less: Allocation to participating securities	(0.1		)	(0.1		)	(0.6		)	(0.1		)
Diluted net income allocated to common stockholders	$	1.4		$	2.3		$	14.2		$	1.9
Denominator:
Weighted average number of:
Common shares outstanding	18,380,971			18,303,968			18,327,517			18,233,340
Dilutive potential common shares outstanding:
Share-based awards	453,621			883,392			494,282			934,587
Diluted weighted-average shares	18,834,592			19,187,360			18,821,799			19,167,927

Assets and Liabilities, at Fair Value Assets and Liabilities, at Fair Value (Tables)

6 Months Ended

Mar. 31, 2013

Assets and Liabilities, at Fair Value [Abstract]

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



	March 31, 2013
(in millions)	Level 1		Level 2		Level 3		Netting and Collateral (1)			Total
Assets:
Money market funds	$	0.1	$	—	$	—	$	—		$	0.1
Certificate of deposits	2.7		—		—		—			2.7
Unrestricted cash equivalents	2.8		—		—		—			2.8
Commodities warehouse receipts	20.9		—		—		—			20.9
U.S. government obligations	—		23.0		—		—			23.0
Securities and other assets segregated under federal and other regulations	20.9		23.0		—		—			43.9
Money market funds	572.2		—		—		—			572.2
U.S. government obligations	—		901.8		—		—			901.8
Mortgage-backed securities	—		6.1		—		—			6.1
Derivatives	1,936.2		74.4		—		(2,030.3		)	(19.7		)
Deposits and receivables from exchange-clearing organizations	2,508.4		982.3		—		(2,030.3		)	1,460.4
Deposits and receivables from broker-dealers, clearing organizations and counterparties - derivatives	0.6		—		—		(0.1		)	0.5
Common and preferred stock and American Depositary Receipts ("ADRs")	45.7		30.5		0.9		—			77.1
Exchangeable foreign ordinary equities and ADRs	18.3		—		—		—			18.3
Corporate and municipal bonds	—		—		3.8		—			3.8
U.S. government obligations	—		0.3		—		—			0.3
Foreign government obligations	9.8		—		—		—			9.8
Derivatives	225.2		387.5		—		(574.6		)	38.1
Commodities leases	—		59.7		—		(43.1		)	16.6
Commodities warehouse receipts	5.4		—		—		—			5.4
Exchange firm common stock	3.7		0.2		—		—			3.9
Mutual funds and other	2.7		—		—		—			2.7
Financial instruments owned	310.8		478.2		4.7		(617.7		)	176.0
Total assets at fair value	$	2,843.5	$	1,483.5	$	4.7	$	(2,648.1	)	$	1,683.6
Liabilities:
Accounts payable and other accrued liabilities - contingent liabilities	$	—	$	—	$	18.4	$	—		$	18.4
Payables to exchange-clearing organizations, broker-dealers and counterparties - derivatives	1,829.2		16.7		—		(1,845.9		)	—
Common and preferred stock and ADRs	67.3		16.8		—		—			84.1
Exchangeable foreign ordinary equities and ADRs	7.8		—		—		—			7.8
Derivatives	219.0		404.6		—		(584.2		)	39.4
Commodities leases	—		249.2		—		(143.1		)	106.1
Financial instruments sold, not yet purchased	294.1		670.6		—		(727.3		)	237.4
Total liabilities at fair value	$	2,123.3	$	687.3	$	18.4	$	(2,573.2	)	$	255.8


(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 is included in that level.



	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 exchange-clearing organizations, broker-dealers and counterparties - 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 is included in that level.

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

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 March 31, 2013 and September 30, 2012 are summarized below:



(in millions)	March 31, 2013			September 30, 2012
Total level 3 assets	$	4.7		$	4.5
Level 3 assets for which the Company bears economic exposure	$	4.7		$	4.5
Total assets	$	3,160.4		$	2,958.9
Total financial assets at fair value	$	1,683.6		$	1,764.3
Total level 3 assets as a percentage of total assets	0.1		%	0.2		%
Level 3 assets for which the Company bears economic exposure as a percentage of total assets	0.1		%	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 Three Months Ended March 31, 2013
(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 stock and ADRs	$	0.9	$	—	$	—	$	—	$	—	$	—	$	0.9
Corporate and municipal bonds	3.6		—		0.2		—		—		—		3.8
	$	4.5	$	—	$	0.2	$	—	$	—	$	—	$	4.7
Liabilities:
Contingent liabilities	$	17.9	$	—	$	0.5	$	—	$	—	$	—	$	18.4



	Level 3 Financial Assets and Financial Liabilities For the Six Months Ended March 31, 2013
(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 stock and ADRs	$	0.9	$	—	$	—	$	—	$	—		$	—	$	0.9
Corporate and municipal bonds	3.6		—		0.2		—		—			—		3.8
	$	4.5	$	—	$	0.2	$	—	$	—		$	—	$	4.7
Liabilities:
Contingent liabilities	$	14.8	$	—	$	0.8	$	3.1	$	(0.3	)	$	—	$	18.4



	Level 3 Financial Assets and Financial Liabilities For the Three Months Ended March 31, 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 stock and ADRs	$	1.1	$	—	$	—	$	—	$	—	$	—	$	1.1
Corporate and municipal bonds	3.5		—		0.1		—		—		—		3.6
Mutual funds and other	0.4		—		—		—		—		—		0.4
	$	5.0	$	—	$	0.1	$	—	$	—	$	—	$	5.1
Liabilities:
Contingent liabilities	$	22.9	$	—	$	0.4	$	—	$	—	$	—	$	23.3



	Level 3 Financial Assets and Financial Liabilities For the Six Months Ended March 31, 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 stock and ADRs	$	1.1	$	—	$	—	$	—	$	—		$	—	$	1.1
Corporate and municipal bonds	3.6		—		—		—		—			—		3.6
Mutual funds and other	0.4		—		—		—		—			—		0.4
	$	5.1	$	—	$	—	$	—	$	—		$	—	$	5.1
Liabilities:
Contingent liabilities	$	22.3	$	—	$	1.3	$	—	$	(0.3	)	$	—	$	23.3

Available-for-sale Securities [Table Text Block]



March 31, 2013
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	$	852.3	$	0.1	$	—	$	852.4
Mortgage-backed securities	6.0		0.1		—		6.1
	$	858.3	$	0.2	$	—	$	858.5



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, were less than $0.1 million.

As of March 31, 2013 and September 30, 2012, investments in debt securities classified as available-for-sale ("AFS") mature as follows:



March 31, 2013
	Due in				Estimated Fair Value
(in millions)	Less than 1 year		1 year or more		Estimated Fair Value
U.S. government obligations	$	852.4	$	—	$	852.4
Mortgage-backed securities	—		6.1		6.1
	$	852.4	$	6.1	$	858.5



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

- 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
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-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
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-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

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

6 Months Ended

Mar. 31, 2013

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

Schedule of Derivative Instruments [Table Text Block]



	March 31, 2013						September 30, 2012
(in millions)	Assets ⁽¹⁾			Liabilities ⁽¹⁾			Assets ⁽¹⁾			Liabilities ⁽¹⁾
Derivative contracts not accounted for as hedges:
Exchange-traded commodity derivatives	$	1,999.8		$	1,813.3		$	3,325.6		$	3,565.3
OTC commodity derivatives	437.6			451.1			823.6			841.4
Exchange-traded foreign exchange derivatives	43.1			39.6			63.0			47.7
OTC foreign exchange derivatives ⁽²⁾	94.1			109.2			215.4			196.6
Exchange-traded interest rate derivatives	3.7			5.6			0.9			2.6
OTC interest rate derivatives	0.5			—			1.6			—
Equity index derivatives	45.1			50.7			20.8			22.0
Gross fair value of derivative contracts	2,623.9			2,469.5			4,450.9			4,675.6
Impact of netting and collateral	(2,605.0		)	(2,430.1		)	(4,548.1		)	(4,631.0		)
Total fair value included in ‘Deposits and receivables from exchange-clearing organizations’	$	(19.7	)				$	(150.4	)
Total fair value included in 'Deposits and receivables from broker-dealers, clearing organizations and counterparties'	$	0.5					$	(0.7	)
Total fair value included in ‘Financial instruments owned, at fair value’	$	38.1					$	53.9
Fair value included in ‘Financial instruments sold, not yet purchased, at fair value’				$	39.4					$	44.6


(1)	As of March 31, 2013 and September 30, 2012, the Company’s derivative contract volume for open positions were approximately 3.2 million and 4.1 million contracts, respectively.


(2)	In accordance with agreements with counterparties, the Company is allowed to periodically take advances against its open trade fair value. There were no advances against open trade fair value outstanding as of March 31, 2013 and September 30, 2012.

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



	Three Months Ended March 31,					Six Months Ended March 31,
(in millions)	2013		2012			2013		2012
Commodities	$	10.8	$	(7.9	)	$	41.4	$	26.3
Foreign exchange	3.1		0.9			5.7		5.6
Interest rate	—		1.7			0.1		0.7
Net gains (losses) from derivative contracts	$	13.9	$	(5.3	)	$	47.2	$	32.6

- 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

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-Name Accounting Standards Codification
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+ Details

Physical Commodities Inventory Physical Commodities Inventory (Tables)

6 Months Ended

Mar. 31, 2013

Physical Commodities Inventory [Abstract]

Schedule of Inventory, Current [Table Text Block]

The carrying values of the Company’s inventory as of March 31, 2013 and September 30, 2012 are shown below.



(in millions)	March 31, 2013		September 30, 2012
Commodities in process	$	0.5	$	13.6
Finished commodities	151.5		118.0
Physical commodities inventory	$	152.0	$	131.6

Goodwill Goodwill (Tables)

6 Months Ended

Mar. 31, 2013

Goodwill [Abstract]

Schedule of Goodwill [Table Text Block]

The carrying value of goodwill by segment is as follows:



(in millions)	March 31, 2013		September 30, 2012
Commodity and Risk Management Services	$	32.0	$	32.0
Foreign Exchange	6.3		6.3
Securities	5.3		5.3
Goodwill	$	43.6	$	43.6

- Definition

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

+ References + Details

Intangible Assets Intangible Assets - (Tables)

6 Months Ended

Mar. 31, 2013

Intangible Assets [Abstract]

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

The gross and net carrying values of intangible assets as of the balance sheet dates, by major intangible asset class are as follows:



	March 31, 2013							September 30, 2012
(in millions)	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Intangible assets subject to amortization
Noncompete agreement	$	3.7	$	(3.5	)	$	0.2	$	3.7	$	(3.0	)	$	0.7
Trade name	0.7		(0.6		)	0.1		0.7		(0.5		)	0.2
Software programs/platforms	2.2		(1.2		)	1.0		2.2		(1.0		)	1.2
Customer base	12.7		(2.0		)	10.7		9.6		(1.8		)	7.8
	19.3		(7.3		)	12.0		16.2		(6.3		)	9.9
Intangible assets not subject to amortization
Trade name	1.2		—			1.2		1.2		—			1.2
Total intangible assets	$	20.5	$	(7.3	)	$	13.2	$	17.4	$	(6.3	)	$	11.1

Schedule of Expected Amortization Expense [Table Text Block]

Amortization expense related to intangible assets was $1.1 million and $1.2 million for the six months ended March 31, 2013 and 2012, respectively.

As of March 31, 2013, the estimated future amortization expense was as follows:



(in millions)
Fiscal 2013 (remaining six months)	$	1.7
Fiscal 2014	1.7
Fiscal 2015	1.4
Fiscal 2016	1.0
Fiscal 2017	1.0
Fiscal 2018 and thereafter	5.2
	$	12.0

Credit Facilities Credit Facilities (Tables)

6 Months Ended

Mar. 31, 2013

Credit Facilities [Abstract]

Schedule of Debt [Table Text Block]

redit facilities, the committed amounts as of March 31, 2013 and outstanding borrowings as of March 31, 2013 and September 30, 2012:



(in millions)					Amounts Outstanding
Borrower	Security	Renewal / Expiration Date	Commitment⁽¹⁾		March 31, 2013		September 30, 2012
INTL FCStone Inc.	Certain pledged shares	October 1, 2013	$	105.0	$	72.0	$	48.0
INTL Commodities	Certain commodities assets	July 31, 2013	140.0		107.0		107.0
FCStone, LLC	None	April 10, 2014	75.0		—		20.0
FCStone Merchants	Certain commodities assets	May 31, 2013	75.0		47.0		43.2
			$	395.0	$	226.0	$	218.2

Capital and Other Regulatory Requirements Capital and Other Regulatory Requirements (Tables)

6 Months Ended

Mar. 31, 2013

Capital and Other Regulatory Requirements [Abstract]

Regulatory Capital Requirements under Banking Regulations [Text Block]

Capital and Other Regulatory Requirements



(in millions)			As of March 31, 2013
Subsidiary	Regulatory Authority	Requirement Type	Actual		Minimum Requirement
FCStone, LLC	CFTC	Net capital	$	108.1	$	70.8
FCStone, LLC	CFTC	Segregated funds	$	1,715.4	$	1,692.2
FCStone, LLC	CFTC	Secured funds	$	94.3	$	83.7
INTL FCStone Ltd	FSA	Net capital	$	50.6	$	23.1
INTL FCStone Ltd	FSA	Segregated funds	$	78.3	$	78.3
INTL Global Currencies Limited	FSA	Net capital	$	19.1	$	0.7
INTL FCStone Securities Inc.	SEC	Net capital	$	2.4	$	1.0
FCC Investments, Inc.	SEC	Net capital	$	0.3	$	0.3
FCStone Australia	Australian Securities and Investment Commission	Net capital	$	2.0	$	1.0
FCStone Australia	New Zealand Clearing Ltd	Capital adequacy	$	11.6	$	1.4
FCStone Commodity Services (Europe), Ltd.	Central Bank of Ireland	Net capital	$	1.9	$	0.6
INTL FCStone DTVM Ltda.	Brazilian Central Bank and Securities and Exchange Commission of Brazil	Capital adequacy	$	0.9	$	0.7

- Definition

+ References

+ Details

Stock-Based Compensation Stock-Based Compensation (Tables)

6 Months Ended

Mar. 31, 2013

Stock-Based Compensation [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:



	Six Months Ended March 31, 2013
Expected stock price volatility	35	%
Expected dividend yield	—	%
Risk free interest rate	0.37	%
Average expected life (in years)	2.88

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

The following is a summary of stock option activity for the six months ended March 31, 2013:



	Shares Available for Grant		Number of Options Outstanding		Weighted Average Price		Weighted Average Grant Date Fair Value		Weighted Average Remaining Term (in years)	Aggregate Intrinsic Value ($ millions)
Balances as of September 30, 2012	921,412		1,890,634		$	23.36	$	11.11	5.45	$	6.0
Expiration of 2003 Plan	(828,321	)
Additional shares authorized	1,000,000
Granted	(100,000	)	100,000		$	17.53	$	4.21
Exercised			(107,984	)	$	4.43	$	2.37
Forfeited	6,666		(16,998	)	$	7.58	$	3.54
Expired	243		(243	)	$	15.02	$	6.67
Balances as of March 31, 2013	1,000,000		1,865,409		$	24.29	$	11.31	5.18	$	3.5
Exercisable as of March 31, 2013			749,637		$	26.32	$	10.94	2.27	$	2.3

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

The following is a summary of restricted stock activity through March 31, 2013:



	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 as of September 30, 2012	1,420,114		512,124		$	22.09	1.81	$	9.8
Granted	(202,172	)	202,172		$	17.83
Vested			(196,066	)	$	21.15
Forfeited	1,011		(6,953	)	$	24.14
Balances as of March 31, 2013	1,218,953		511,277		$	20.74	2.16	$	8.9

Other Expenses Other Expenses (Tables)

6 Months Ended

Mar. 31, 2013

Other Expenses [Abstract]

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

Other expenses for the three and six months ended March 31, 2013 and 2012 consisted of the following:



	Three Months Ended March 31,				Six Months Ended March 31,
(in millions)	2013		2012		2013		2012
Business development	$	2.2	$	3.1	$	5.2	$	6.3
Contingent consideration, net⁽¹⁾	0.5		0.9		1.2		2.2
Insurance	0.4		0.4		0.9		0.8
Advertising, meetings and conferences	0.7		0.5		1.1		1.1
Non-trading hardware and software maintenance and software licensing	1.0		0.8		1.6		1.4
Office supplies and printing	0.4		0.4		0.7		0.7
Other non-income taxes	1.1		1.2		2.2		1.9
Other	1.5		1.2		4.1		3.0
	$	7.8	$	8.5	$	17.0	$	17.4

(1)

Segment Analysis Segment Analysis (Tables)

6 Months Ended

Mar. 31, 2013

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:



	Three Months Ended March 31,					Six Months Ended March 31,
(in millions)	2013			2012		2013			2012
Total revenues:
Commodity and Risk Management Services	$	13,002.9		$	16,872.7	$	25,622.7		$	34,074.7
Foreign Exchange	16.1			13.0		32.3			30.9
Securities	16.0			10.3		28.9			20.2
Clearing and Execution Services	25.3			25.4		47.7			43.1
Other	53.3			28.0		92.8			73.2
Corporate unallocated	(0.5		)	1.6		8.2			(0.7		)
Total	$	13,113.1		$	16,951.0	$	25,832.6		$	34,241.4
Operating revenues (loss):
Commodity and Risk Management Services	$	56.1		$	65.7	$	116.8		$	115.7
Foreign Exchange	16.1			13.0		32.3			30.9
Securities	16.0			10.3		28.9			20.2
Clearing and Execution Services	25.3			25.4		47.7			43.1
Other	4.3			3.6		9.1			6.7
Corporate unallocated	(0.5		)	1.6		8.2			(0.7		)
Total	$	117.3		$	119.6	$	243.0		$	215.9
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	$	31.2		$	37.0	$	71.7		$	66.8
Foreign Exchange	10.2			8.6		20.6			20.3
Securities	9.2			5.1		16.1			9.6
Clearing and Execution Services	3.6			3.8		7.2			6.3
Other	2.4			2.6		5.2			4.7
Total	$	56.6		$	57.1	$	120.8		$	107.7
Segment income (loss):
(Net contribution less non-variable direct segment costs):
Commodity and Risk Management Services	$	12.6		$	18.0	$	35.3		$	31.1
Foreign Exchange	6.9			5.2		14.0			14.2
Securities	4.2			0.8		7.4			1.9
Clearing and Execution Services	0.7			0.7		(0.2		)	0.6
Other	1.4			1.3		3.3			2.1
Total	$	25.8		$	26.0	$	59.8		$	49.9
Reconciliation of segment income to income from operations, before tax:
Segment income	$	25.8		$	26.0	$	59.8		$	49.9
Costs not allocated to operating segments	24.4			22.4		39.6			47.0
Income from operations, before tax	$	1.4		$	3.6	$	20.2		$	2.9

(in millions)	As of March 31, 2013			As of September 30, 2012
Total assets:
Commodity and Risk Management Services	$	1,511.3		$	1,449.2
Foreign Exchange	164.6			124.5
Securities	166.5			88.7
Clearing and Execution Services	1,119.9			1,090.9
Other	76.2			110.8
Corporate unallocated	121.9			94.8
Total	$	3,160.4		$	2,958.9

- 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 Basis of Presentation and Consolidation (Details)	6 Months Ended
	Mar. 31, 2013
Basis of Presentation and Consolidation (Reclassifications) [Abstract]
Number of different types of foreign currencies	130
Number of customers company-wide	20,000

Earnings per Share Earnings per Share - Antidulitive Securities (Details) - shares	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Note 2 – Earnings per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,490,288	1,190,859	1,490,288	1,190,859

- 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 Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations Attributable to Parent	$ 1.5	$ 2.4	$ 14.8	$ 2.0
Undistributed Earnings Allocated to Participating Securities - Continuing Ops	(0.1)	(0.1)	(0.6)	(0.1)
Income from continuing operations allocated to common stockholders	1.4	2.3	14.2	1.9
Net Income (Loss) Available to Common Stockholders, Diluted	1.5	2.4	14.8	2.0
Undistributed Earnings Allocated to Participating Securities	(0.1)	(0.1)	(0.6)	(0.1)
Diluted net income allocated to common stockholders	$ 1.4	$ 2.3	$ 14.2	$ 1.9
Weighted Average Number of Shares Outstanding, Basic	18,380,971	18,303,968	18,327,517	18,233,340
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Stock Options And Warrants For Diluted Earnings Per Share Calculation	453,621	883,392	494,282	934,587
Diluted weighted-average shares	18,834,592	19,187,360	18,821,799	19,167,927

Assets and Liabilities, at Fair Value Assets and Liabilities, at Fair Value - Details of Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Assets and Liabilities, at Fair Value [Abstract]
Total Level 3 Assets	$ 4.7	$ 4.5
Level 3 assets for which the company bears economic exposure	4.7	4.5
Assets	3,160.4	2,958.9
Assets, Fair Value Disclosure	$ 1,683.6	$ 1,764.3
Total level 3 assets as a percentage of total assets	0.10%	0.20%
Level 3 assets for which the company bears economic exposure as a percertange of total assets	0.10%	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 Assets and Liabilities, at Fair Value - Rollforward of Level 3 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Rollforward of Level 3 Securities [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 4.5	$ 5.0	$ 4.5	$ 5.1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	0.2	0.1	0.2	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	4.7	5.1	4.7	5.1
Contingent Consideration [Member]
Rollforward of Level 3 Liabilities [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	17.9	22.9	14.8	22.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)	0.5	0.4	0.8	1.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	0.0	0.0	3.1	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	0.0	0.0	(0.3)	(0.3)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	18.4	23.3	18.4	23.3
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	0.9	1.1	0.9	1.1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0.9	1.1	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	3.5	3.6	3.6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	0.2	0.1	0.2	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 3.8	3.6	$ 3.8	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		0.0		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, Purchases		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		$ 0.4		$ 0.4

Assets and Liabilities, at Fair Value Assets and Liabilities, at Fair Value - Schedule of Financial Instruments Owned and Sold, Not Yet Purchased (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Derivative Liabilities	$ 39.4	$ 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 Assets and Liabilities, at Fair Value - Contingent Consideration (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Contingent Consideration [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)	$ 0.5	$ 0.4	$ 0.8	$ 1.3

Assets and Liabilities, at Fair Value Assets and Liabilities, at Fair Value - Available for Sale Securities - Fin Inst (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 858.3	$ 1,305.7
Available-for-sale Securities, Gross Unrealized Gains	0.2	0.1
Available-for-sale Securities, Gross Unrealized Losses	0.0	0.0
Available-for-sale Securities, Debt Securities	$ 858.5	$ 1,305.8

- 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 Assets and Liabilities, at Fair Value - Available for Sale Securities - Dep and Rec (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 858.3	$ 1,305.7
Available-for-sale Securities, Gross Unrealized Gains	0.2	0.1
Available-for-sale Securities, Gross Unrealized Losses	0.0	0.0
Available-for-sale Securities, Debt Securities	858.5	1,305.8
US Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	852.3	1,298.9
Available-for-sale Securities, Gross Unrealized Gains	0.1	0.0
Available-for-sale Securities, Gross Unrealized Losses	0.0	0.0
Available-for-sale Securities, Debt Securities	852.4	1,298.9
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	6.0	6.8
Available-for-sale Securities, Gross Unrealized Gains	0.1	0.1
Available-for-sale Securities, Gross Unrealized Losses	0.0	0.0
Available-for-sale Securities, Debt Securities	6.1	6.9
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	$ 858.5	$ 1,305.8

- Definition

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

+ References

+ Details

Assets and Liabilities, at Fair Value Assets and Liabilities, at Fair Value - Available for Sale Securities (Maturities) (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	$ 852.4	$ 1,298.9
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	6.1	6.9
Available-for-sale Securities, Debt Securities	858.5	1,305.8
US Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	852.4	1,298.9
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	0.0	0.0
Available-for-sale Securities, Debt Securities	852.4	1,298.9
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	6.1	6.9
Available-for-sale Securities, Debt Securities	$ 6.1	$ 6.9

- Definition

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

+ References

+ Details

Assets and Liabilities, at Fair Value Assets and Liabilities, at Fair Value - Available for Sale Securities in OCI (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
Assets and Liabilities, at Fair Value [Abstract]
Gain (Loss) on Sale of Exchange Shares	$ 0.9
Equity Investments in Exchange Stock - Cost	4.0
Equity Investments in Exchange Stock - Fair Value	4.0		$ 12.4
Proceeds from Sale of Available-for-sale Securities	8.6
Proceeds from Shares of Exchanges Sold	1.5
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax - LME Shares		$ 6.3
Deferred Tax Liabilities, Accumulated Other Comprehensive Income - LME Shares		$ 2.0
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax - Other Exchange Shares	(0.2)
Deferred Tax Assets, Accumulated Other Comprehensive Income - Other Exchange Shares	$ 0.1

Assets and Liabilities, at Fair Value Assets and Liabilities, at Fair Value Assets and Liabilities, at Fair Value - Limit Move (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Assets and Liabilities, at Fair Value [Abstract]
Receivables from Clearing Organizations	$ 1,672.2	$ 1,619.8
Payables to Customers	$ (2,234.3)	$ (2,072.3)

- Definition

Amounts payable to customers at the balance sheet date. The term customers generally excludes other broker-dealers; persons who are principal officers, directors, and stockholders; and persons whose securities or funds are part of the regulatory net capital of the broker-dealer. Another broker-dealer's account can be classified as a customer if the account is carried as an omnibus account in compliance with certain regulations. The accounts of principal officers, directors and stockholders may be combined in the customer captions if they are not material and the combination is disclosed in the oath that is required to accompany the annual audited FOCUS Report.

+ References + Details

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	Mar. 31, 2013	Sep. 30, 2012
Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract]
Financial Instruments Sold, Not yet Purchased, at Fair Value	$ 237.4	$ 175.4
Derivatives Liabilties	$ 39.4	$ 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, $ in Millions	6 Months Ended
	Mar. 31, 2013 USD ($)	Sep. 30, 2012
Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract]
Notional Amount of Interest Rate Derivatives	$ 400
Derivative, Average Remaining Maturity	3 months
Derivative, Number of Instruments Held	3.2	4.1

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	Mar. 31, 2013	Sep. 30, 2012
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 2,623.9	$ 4,450.9
Derivative Liability, Fair Value, Gross Liability	2,469.5	4,675.6
Derivative Asset, Fair Value, Amount Offset Against Collateral	(2,605.0)	(4,548.1)
Derivative Liability, Fair Value, Amount Offset Against Collateral	(2,430.1)	(4,631.0)
Exchange-traded Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,999.8	3,325.6
Derivative Liability, Fair Value, Gross Liability	1,813.3	3,565.3
Over the Counter (OTC) Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	437.6	823.6
Derivative Liability, Fair Value, Gross Liability	451.1	841.4
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	43.1	63.0
Derivative Liability, Fair Value, Gross Liability	39.6	47.7
Over the Counter (OTC) Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	94.1	215.4
Derivative Liability, Fair Value, Gross Liability	109.2	196.6
Exchange-traded interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	3.7	0.9
Derivative Liability, Fair Value, Gross Liability	5.6	2.6
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.5	1.6
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Equity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	45.1	20.8
Derivative Liability, Fair Value, Gross Liability	50.7	22.0
Deposits and receivables from exchange clearing organizations [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(19.7)	(150.4)
Deposits and receivables from broker-dealers, clearing organizations and counterparties [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	0.5	(0.7)
Financial instruments owned [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	38.1	53.9
Financial instrument sold, not yet purchased [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ 39.4	$ 44.6

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Realized Gains/Losses on Derivative Contracts (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 10.8	$ (7.9)	$ 41.4	$ 26.3
Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	3.1	0.9	5.7	5.6
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	0.0	1.7	0.1	0.7
Derivative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 13.9	$ (5.3)	$ 47.2	$ 32.6

- 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

Receivables from customers and notes receivable, net - Allowance for Customer Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Receivables from customers and notes receivable, net [Abstract]
Allowance for Doubtful Accounts Receivable	$ 1.0	$ 0.9

Receivables from customers and notes receivable, net - Allowance for Notes Receivable (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Receivables from customers and notes receivable, net [Abstract]
Allowance Notes Receivable	$ 0.1	$ 0.1

Receivables from customers and notes receivable, net Exim Bank Notes Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2012	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Insured short-term notes receivable	$ 21.7	$ 10.2
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 Physical Commodities Inventory - Inventory Serving as Collateral (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Physical Commodities Inventory [Abstract]
Inventory serving as collateral	$ 97.0	$ 129.1

Physical Commodities Inventory Physical Commodities Inventory - Physical Commodities Inventory by CIP and Finished (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Physical Commodities Inventory [Abstract]
Commodities in process	$ 0.5	$ 13.6
Finished commodities	151.5	118.0
Physical commodities inventory	$ 152.0	$ 131.6

Physical Commodities Inventory Physical Commodities Inventory - LCM Adjustments (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Note 6 – Physical Commodities Inventory [Abstract]
Inventory Adjustments	$ 2.7	$ 0.4

Goodwill Goodwill - Goodwill by Segment (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Goodwill [Line Items]
Goodwill	$ 43.6	$ 43.6
Commodity and Risk Management [Member]
Goodwill [Line Items]
Goodwill	32.0	32.0
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

Intangible Assets Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 19.3	$ 16.2
Finite-Lived Intangible Assets, Accumulated Amortization	(7.3)	(6.3)
Finite-Lived Intangible Assets, Net	12.0	9.9
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	(3.5)	(3.0)
Finite-Lived Intangible Assets, Net	0.2	0.7
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Trade Names, Gross	0.7	0.7
Finite-Lived Intangible Assets, Accumulated Amortization	(0.6)	(0.5)
Finite-Lived Intangible Assets, Net	0.1	0.2
Computer Software, Intangible Asset [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Computer Software, Gross	2.2	2.2
Finite-Lived Intangible Assets, Accumulated Amortization	(1.2)	(1.0)
Finite-Lived Intangible Assets, Net	1.0	1.2
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Customer Lists, Gross	12.7	9.6
Finite-Lived Intangible Assets, Accumulated Amortization	(2.0)	(1.8)
Finite-Lived Intangible Assets, Net	$ 10.7	$ 7.8

Intangible Assets Intangible Assets - Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Mar. 31, 2013	Sep. 30, 2012
Indefinite-lived Intangible Assets [Line Items]
Gross Finite and Indefinite-Lived Intangible Assets	$ 20.5	$ 17.4
Finite and Indefinited-Lived Accumulated Amortization and Impairment Charges	(7.3)	(6.3)
Intangible Assets, Net (Excluding Goodwill)	13.2	11.1
Trade Names [Member]
Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Trade Names	1.2	1.2
Indefinite-lived Intangible Assets, Impairment Losses	$ 0.0	$ 0.0

Intangible Assets Intangible Assets - Finite-Lived Intangible Assets Future Amortization Expense (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Intangible Assets [Abstract]
Amortization of Intangible Assets	$ 1.1	$ 1.2
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Fiscal 2013, Remainder of Fiscal Year	1.7
Fiscal 2014	1.7
Fiscal 2015	1.4
Fiscal 2016	1.0
Fiscal 2017	1.0
Fiscal 2018 and thereafter	5.2
Finite-Lived Intangible Assets, Net	$ 12.0		$ 9.9

Credit Facilities Credit Facilities - Number of Credit Facilities (Details)	Mar. 31, 2013
Credit Facilities [Abstract]
Number of credit facilities	4

Credit Facilities Credit Facilities - Credit Facilities (Details) - USD ($) $ in Millions	Apr. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding		$ 226.0		$ 218.2
Main line of credit facilities [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 355.0	395.0
HCO Syndicated line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		105.0	$ 95.0
Line of Credit Facility, Amount Outstanding		72.0		48.0
INTL COM line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100.0	140.0
Line of Credit Facility, Amount Outstanding		107.0		107.0
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, Amount Outstanding		0.0		20.0
FMS Sub-note commodity line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		75.0
Line of Credit Facility, Amount Outstanding		$ 47.0		$ 43.2

Commodity and Other Repurchase Agreements Commodity and Other Repurchase Agreements (Details) - USD ($) $ in Millions	Mar. 31, 2013	Sep. 30, 2012
Assets Sold under Agreements to Repurchase [Line Items]
Financing Receivables, net - Sales/Repurchase Agreements	$ 54.7	$ 92.5
Broker-dealers, Clearing Organizations and Counterparties [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Obligations outstanding related to commodities sold under repurchase agreements	0.0	37.0
Lenders Under Loans [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Obligations outstanding related to commodities sold under repurchase agreements	$ 47.0	$ 43.2

Commitments and Contingencies Commitments and Contingencies - Contingencies and Litigation (Details)	6 Months Ended
	Mar. 31, 2013 USD ($)
Excess segregated funds returned	$ 15,500,000
Sentinel Appeal Cash Deposit	8,000,000
Excess segregated funds invested	21,900,000
Loss Contingency, Loss in Period	1,500,000
Loss Contingency, Settlement Agreement, Consideration	250,000
Pre and Post Transfers of Funds related to Sentinel	15,500,000
Customer Segregated Transfers of Funds Pursuant to Safe Harbor	1,100,000
Maximum [Member]
Excess segregated funds returned	6,000,000
Minimum [Member]
Excess segregated funds returned	$ 4,000,000

Commitments and Contingencies Commitments and Contingencies - Contigent Consideration for Acquisitions (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Mar. 31, 2012
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		$ 3.9	$ 1.4
Coffee Network Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Contingent Consideration, at Fair Value	$ 0.1	0.1
Hencorp Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		0.2
Business Acquisition, Contingent Consideration, at Fair Value	2.5	2.5
Hanley Group Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0.2	0.4
Business Acquisition, Contingent Consideration, at Fair Value	9.7	$ 9.7
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 Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0.1
Business Acquisition, Contingent Consideration, at Fair Value	3.1	$ 3.1
Tradewire Acquisition [Member] [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles	3.1	3.1
Hencorp Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price	6.7	6.7
Hanley Group Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price	53.9	53.9
RMI-RMC Acquistion [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price	15.3	15.3
Coffee Network Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Consideration Transferred	$ 0.3	$ 0.3

Capital and Other Regulatory Requirements Capital and Other Regulatory Requirements - Regulatory Capital Requirements (Details) $ in Millions	Mar. 31, 2013 USD ($)
Cash and Securities Segregated under Commodity Exchange Act Regulation	$ 1,715.4
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated	1,692.2
Secured Funds	94.3
Secured Funds Required Under Commodity Exchange Act	83.7
FCStone LLC [Member]
Net Capital under Commodity Exchange Act Computation	108.1
Required Net Capital under Commodity Exchange Act	70.8
INTL Trading [Member]
Net Capital	2.4
Minimum Net Capital Required for Entity	1.0
FCC Investments [Member]
Net Capital	0.3
Minimum Net Capital Required for Entity	0.3
FCStone Australia [Member]
Net Capital under Commodity Exchange Act Computation	2.0
Required Net Capital under Commodity Exchange Act	1.0
Net Capital	11.6
Capital Required for Capital Adequacy	1.4
INTL FCStone Europe [Member]
Net Capital under Commodity Exchange Act Computation	50.6
Required Net Capital under Commodity Exchange Act	23.1
Net Capital	78.3
Cash and Securities Segregated under Commodity Exchange Act Regulation	78.3
FCStone Europe [Member]
Net Capital under Commodity Exchange Act Computation	1.9
Required Net Capital under Commodity Exchange Act	0.6
INTL FCStone DTVM Ltda [Member]
Net Capital	0.0
Capital Required for Capital Adequacy	0.0
INTL Global Currencies [Member]
Net Capital under Commodity Exchange Act Computation	19.1
Required Net Capital under Commodity Exchange Act	$ 0.7

Stock-Based Compensation Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Note 13 – Stock-Based Compensation [Abstract]
Allocated Share-based Compensation Expense	$ 1.9	$ 1.3	$ 3.5	$ 2.3

- 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-Based Compensation - Stock Option Plan (Details)	6 Months Ended
	Mar. 31, 2013 shares
Stock-Based Compensation [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	1,000,000

Stock-Based Compensation Stock-Based Compensation - Stock Option Plan Fair Value Weighted-Average Assumptions (Details)	6 Months Ended
	Mar. 31, 2013
Stock-Based Compensation [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	35.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	0.37%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	2 years 321 days

Stock-Based Compensation Stock-Based Compensation - Stock Based Compensation Table (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	921,412
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,890,634
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	(100,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease)	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(107,984)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	6,666
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period	(16,998)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Net	243
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	(243)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,000,000		921,412
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,865,409		1,890,634
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	749,637
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 24.29		$ 23.36
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	17.53
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	4.43
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	7.58
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	15.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	26.32
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value	11.31		$ 11.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	4.21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excrecises in Period, Weighted Average Grant Date Fair Value	2.37
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeited in Period, Weighted Average Grant Date Fair Value	3.54
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expired in Period, Weighted Average Grant Date Fair Value	6.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excercisable, Weighted Average Grant Date Fair Value	$ 10.94
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 66 days		5 years 164 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	2 years 99 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 3.5		$ 6.0
Expiration of 2003 Plan	(828,321)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 2.3
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options	$ 11.0
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	6 years 51 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 1.7	$ 2.2

Stock-Based Compensation Stock-Based Compensation - Restricted Stock Plan (Details) - shares	6 Months Ended	12 Months Ended
	Mar. 31, 2013	Sep. 30, 2012
Stock-Based Compensation [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	1,218,953	1,420,114

Stock-Based Compensation Stock-Based Compensation - Restricted Stock Plan Table (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2012	Mar. 31, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted		1,218,953	1,420,114
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	512,124	512,124
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)		(202,172)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		202,172
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		(196,066)
ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted		1,218,953	1,420,114
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		511,277	512,124
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		$ 20.74	$ 22.09
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		17.83
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value		$ 21.15
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		2 years 58 days	1 year 295 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value		$ 8,900,000	$ 9,800,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		$ 8.6
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition - Restricted Stock		2 years 58 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures	1,011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(6,953)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 24.14

Other Expenses Other Expenses - Other Expenses Breakout (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	$ 7.8	$ 8.5	$ 17.0	$ 17.4
Travel and Entertainment Expense [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	2.2	3.1	5.2	6.3
Contingent Consideration [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	0.5	0.9	1.2	2.2
Insurance Expense [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	0.4	0.4	0.9	0.8
Advertising, Meetings and Conferences [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	0.7	0.5	1.1	1.1
Non-trading hardware and software maintenance and software licensing [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	1.0	0.8	1.6	1.4
Office supplies and printing [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	0.4	0.4	0.7	0.7
Taxes Other than Income and Excise Taxes [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	1.1	1.2	2.2	1.9
Other Operating Expense [Member]
Component of Operating Other Cost and Expense [Line Items]
Other Cost and Expense, Operating	$ 1.5	$ 1.2	$ 4.1	$ 3.0

Income Taxes Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Income Taxes Income Taxes (Details) - USD ($) $ in Millions	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Abstract]
Income Tax Expense (Benefit)	$ (0.1)	$ 1.2	$ 5.4	$ 1.0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	0.00%	33.00%	27.00%	34.00%

Acquisitions and Dispositions - Acquisitions (Details) $ in Millions	Mar. 31, 2013 USD ($)
Tradewire Acquisition [Member] [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Amortizable Intangibles	$ 3.1

Acquisitions and Dispositions Acquisitions and Dispositions - Dispositions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds	$ 0.8		$ 0.8
Disposal Group, Including Discontinued Operation, Assets of Disposal Group			0.6
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, before Tax	$ 0.1	$ 0.0	$ 0.1	$ 0.0

- Definition

Before tax amount of the income statement impact of the reclassification adjustment for translation gain (loss) realized upon the sale or complete or substantially complete liquidation of an investment in a foreign entity. Also includes reclassification adjustments on foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 14, 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.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-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 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 18, 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.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-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 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(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.

+ Details

Segment Analysis Segment Analysis - Reportable Segments (Details)	6 Months Ended
	Mar. 31, 2013
Segment Analysis [Abstract]
Number of different types of foreign currencies	130

Segment Analysis Segment Analysis (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenues	$ 13,113.1	$ 16,951.0	$ 25,832.6	$ 34,241.4
Gross Profit	117.3	119.6	243.0	215.9
Net Contribution	56.6	57.1	120.8	107.7
Net Segment Income	25.8	26.0	59.8	49.9
Costs not allocated	24.4	22.4	39.6	47.0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	1.4	3.6	20.2	2.9
Assets	3,160.4		3,160.4		$ 2,958.9
Commodity and Risk Management [Member]
Segment Reporting Information [Line Items]
Revenues	13,002.9	16,872.7	25,622.7	34,074.7
Gross Profit	56.1	65.7	116.8	115.7
Net Contribution	31.2	37.0	71.7	66.8
Net Segment Income	12.6	18.0	35.3	31.1
Assets	1,511.3		1,511.3		1,449.2
Foreign Exchange Segment [Member]
Segment Reporting Information [Line Items]
Revenues	16.1	13.0	32.3	30.9
Gross Profit	16.1	13.0	32.3	30.9
Net Contribution	10.2	8.6	20.6	20.3
Net Segment Income	6.9	5.2	14.0	14.2
Assets	164.6		164.6		124.5
Securities Segment [Member]
Segment Reporting Information [Line Items]
Revenues	16.0	10.3	28.9	20.2
Gross Profit	16.0	10.3	28.9	20.2
Net Contribution	9.2	5.1	16.1	9.6
Net Segment Income	4.2	0.8	7.4	1.9
Assets	166.5		166.5		88.7
Clearing and Execution Services Segment [Member]
Segment Reporting Information [Line Items]
Revenues	25.3	25.4	47.7	43.1
Gross Profit	25.3	25.4	47.7	43.1
Net Contribution	3.6	3.8	7.2	6.3
Net Segment Income	0.7	0.7	(0.2)	0.6
Assets	1,119.9		1,119.9		1,090.9
Other Segment [Member]
Segment Reporting Information [Line Items]
Revenues	53.3	28.0	92.8	73.2
Gross Profit	4.3	3.6	9.1	6.7
Net Contribution	2.4	2.6	5.2	4.7
Net Segment Income	1.4	1.3	3.3	2.1
Assets	76.2		76.2		110.8
Corporate [Member]
Segment Reporting Information [Line Items]
Revenues	(0.5)	1.6	8.2	(0.7)
Gross Profit	(0.5)	$ 1.6	8.2	$ (0.7)
Assets	$ 121.9		$ 121.9		$ 94.8