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Physical Commodities Inventory Physical Commodities Table (Tables)
 3 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(in millions)
December 31,
2018
 
September 30,
2018
Physical Ag & Energy(1)
$
151.1

 
$
114.7

Precious metals - held by broker-dealer subsidiary(2)
13.3

 
42.1

Precious metals - held by non-broker-dealer subsidiaries(3)
58.1

 
65.7

Physical commodities inventory
$
222.5

 
$
222.5