Commodity and Other Repurchase Agreements Gross Obligations Contractual Maturities (Tables)

12 Months Ended

Sep. 30, 2018

Assets Sold under Agreements to Repurchase [Line Items]

Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block]

	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

	September 30, 2017
	Overnight and Open		Less than 30 Days		30-90 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