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

9 Months Ended

Jun. 30, 2019

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]

	June 30, 2019
	Overnight and Open		Less than 30 Days		30-90 Days		Total
Securities sold under agreements to repurchase	$	1,816.4	$	585.3	$	499.0	$	2,900.7
Securities loaned	1,240.9		—		—		1,240.9
Gross amount of secured financing	$	3,057.3	$	585.3	$	499.0	$	4,141.6

	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