Commodity and Other Repurchase Agreements and Collateralized Transactions Schedule of Collateralized Financings by Collateral Type (Tables)

6 Months Ended

Mar. 31, 2018

Financial Instruments Owned and Pledged as Collateral [Line Items]

Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]

Securities sold under agreements to repurchase:	March 31, 2018		September 30, 2017
U.S. Treasury obligations	$	5.1	$	7.0
U.S. government agency obligations	358.1		332.6
Asset-backed obligations	75.0		36.4
Agency mortgage-backed obligations	1,124.3		1,017.1
Total securities sold under agreements to repurchase	1,562.5		1,393.1
Securities loaned:
Common stock	559.1		111.1
Total securities loaned	559.1		111.1
Gross amount of secured financing	$	2,121.6	$	1,504.2