Credit Facilities (Tables)

12 Months Ended

Sep. 30, 2017

Credit Facilities [Abstract]

Schedule of Debt [Table Text Block]

The following table sets forth a listing of credit facilities, the current committed amounts, as of the report date, on the facilities, and outstanding borrowings on the facilities as well as indebtedness on a promissory note and on senior notes as of September 30, 2017 and 2016:

(in millions)
Credit Facilities						Amounts Outstanding
	Borrower	Security	Renewal / Expiration Date	Total Commitment		September 30, 2017		September 30, 2016
Committed Credit Facilities
	INTL FCStone Inc.	Pledged shares of certain subsidiaries	March 18, 2019	$	262.0	$	150.0	$	136.5
	INTL FCStone Financial, Inc.	None	April 5, 2018	75.0		—		—
	FCStone Merchants Services, LLC	Certain commodities assets	May 1, 2018	170.0		44.2		43.5
	INTL FCStone Ltd.	None	November 7, 2018	25.0		—		—
				$	532.0	194.2		180.0
Uncommitted Credit Facilities
	INTL FCStone Financial, Inc.	Commodity warehouse receipts and certain pledged securities	n/a	—		34.0		—
	INTL FCStone Ltd.	Commodity warehouse receipts	n/a	—		—		—
Note Payable to Bank
	Monthly installments, due March 2020 and secured by certain equipment					2.0		2.8
Senior Unsecured Notes
	8.50% senior notes, redeemed October 15, 2016					—		44.5
Total indebtedness						$	230.2	$	227.3