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

9 Months Ended

Jun. 30, 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:	June 30, 2018		September 30, 2017
U.S. Treasury obligations	$	3.0	$	7.0
U.S. government agency obligations	342.6		332.6
Asset-backed obligations	77.6		36.4
Agency mortgage-backed obligations	1,175.8		1,017.1
Total securities sold under agreements to repurchase	1,599.0		1,393.1
Securities loaned:
Common stock	204.3		111.1
Total securities loaned	204.3		111.1
Gross amount of secured financing	$	1,803.3	$	1,504.2