Physical Commodities Inventory Physical Commodities Table (Tables)

6 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

(in millions)	March 31, 2018		September 30, 2017
Physical Ag & Energy(1)	$	160.2	$	65.1
Precious metals - held by broker-dealer subsidiary(2)	26.9		13.3
Precious metals - held by non-broker-dealer subsidiaries(3)	99.2		46.4
Physical commodities inventory	$	286.3	$	124.8