Commodity and Other Repurchase Agreements and Collateralized Transactions Schedule of Gross Collateralized Financings by Maturity (Tables)

3 Months Ended

Dec. 31, 2017

Assets Sold under Agreements to Repurchase [Line Items]

Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity [Table Text Block]

	December 31, 2017
	Overnight and Open	Less than 30 Days	30-90 Days	Over 90 Days	Total
Securities sold under agreements to repurchase	$1,121.4	$239.0	$290.0	—	$1,650.4
Securities loaned	108.8	—	—	—	108.8
Gross amount of secured financing	$1,230.2	$239.0	$290.0	$0.0	$1,759.2

	September 30, 2017
	Overnight and Open	Less than 30 Days	30-90 Days	Over 90 Days	Total
Securities sold under agreements to repurchase	$640.2	$432.9	$320.0	—	$1,393.1
Securities loaned	111.1	—	—	—	111.1
Gross amount of secured financing	$751.3	$432.9	$320.0	—	$1,504.2