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

3 Months Ended

Dec. 31, 2018

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, 2018
	Overnight and Open		Less than 30 Days		30-90 Days		Total
Securities sold under agreements to repurchase	$	1,593.8	$	370.0	$	275.5	$	2,239.3
Securities loaned	1031.0		—		—		1031.0
Gross amount of secured financing	$	2,624.8	$	370.0	$275.5		$	3,270.3

	September 30, 2018
	Overnight and Open		Less than 30 Days		30-90 Days		Total
Securities sold under agreements to repurchase	$	934.9	$	661.3	$	340.5	$	1,936.7
Securities loaned	277.9		—		—		277.9
Gross amount of secured financing	$	1,212.8	$	661.3	$	340.5	$	2,214.6