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

3 Months Ended

Dec. 31, 2017

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:	December 31, 2017		September 30, 2017
U.S. Treasury obligations	$	3.2	$	7.0
U.S. government agency obligations	358.2		332.6
Asset-backed obligations	75.0		36.4
Agency mortgage-backed obligations	1,214.0		1,017.1
Total securities sold under agreements to repurchase	$	1,650.4	$	1,393.1
Securities loaned:
Common stock	108.8		111.1
Total securities loaned	108.8		111.1
Gross amount of secured financing	$	1,759.2	$	1,504.2