Regulatory Requirements and Subsidiary Dividend Restrictions (Tables)

12 Months Ended

Sep. 30, 2013

Capital and Other Regulatory Requirements [Abstract]

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

All subsidiaries of the Company are in compliance with all of their regulatory requirements as of September 30, 2013, as follows:

(in millions)			As of September 30, 2013
Subsidiary	Regulatory Authority	Requirement Type	Actual		Minimum Requirement
FCStone, LLC	CFTC	Net capital	$	106.3	$	66.3
FCStone, LLC	CFTC	Segregated funds	$	1,693.5	$	1,669.6
FCStone, LLC	CFTC	Secured funds	$	82.5	$	59.8
INTL FCStone Ltd	FCA (United Kingdom)	Net capital	$	60.8	$	23.4
INTL FCStone Ltd	FCA United Kingdom	Segregated funds	$	61.2	$	61.1
INTL Global Currencies Limited	FCA (United Kingdom)	Net capital	$	11.4	$	1.2
INTL FCStone Securities Inc.	SEC	Net capital	$	5.0	$	1.0
FCC Investments, Inc.	SEC	Net capital	$	0.3	$	0.3
FCStone Australia	Australian Securities and Investment Commission	Net capital	$	1.8	$	0.9
FCStone Australia	New Zealand Clearing Ltd	Capital adequacy	$	11.6	$	4.1
FCStone Commodity Services (Europe), Ltd	Central Bank of Ireland	Net capital	$	2.0	$	0.6
INTL FCStone DTVM Ltda.	Brazilian Central Bank and Securities and Exchange Commission of Brazil	Capital adequacy	$	0.7	$	0.7
INTL Capital S.A.	Rosario Futures Exchange (Argentina)	Capital adequacy	$	6.3	$	0.1
INTL Capital S.A.	General Inspector of Justice (Argentina)	Net capital	$	8.5	$	6.4
INTL Capital S.A.	Superintendent of Securities Markets of Buenos Aires (Argentina)	Net capital	$	4.0	$	0.3

Schedule of Regulatory Assets [Table Text Block]

Funds deposited by customers and other assets, which have been segregated as belonging to the commodity customers as of September 30, 2013 and 2012, are as follows:

(in millions)	September 30, 2013		September 30, 2012
Cash, at banks - segregated	$	247.6	$	225.6
Securities - customer segregated	—		—
Securities held for customers in lieu of cash, at banks	19.5		47.2
Deposits with and receivables from:
Exchange-clearing organizations, including securities, net of omnibus eliminations	1,413.3		1,370.4
Securities held for customers in lieu of cash	13.1		22.3
Total customer-segregated funds	1,693.5		1,665.5
Amount required to be segregated	1,669.6		1,620.5
Excess funds in segregation	$	23.9	$	45.0

Funds deposited by customers and other assets, which are held in separate accounts for customers trading foreign futures and foreign options customers, as of September 30, 2013 and 2012 are as follows:

(in millions)	September 30, 2013		September 30, 2012
Cash - secured	$	34.2	$	25.2
Securities	—		3.3
Equities with futures commission merchants	27.0		9.9
Amounts held by clearing organizations of foreign boards of trade	—		20.8
Amounts held by members of foreign boards of trade	21.3		30.1
Total customer-secured funds	82.5		89.3
Amount required to be secured	59.8		77.6
Excess secured funds	$	22.7	$	11.7