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Physical Commodities Inventory Physical Commodities Table (Tables)
 3 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(in millions)
December 31,
2017
 
September 30,
2017
Physical Ag & Energy(1)
$
125.1

 
$
65.1

Precious metals - held by broker-dealer subsidiary(2)
20.1

 
13.3

Precious metals - held by non-broker-dealer subsidiaries(3)
99.5

 
46.4

Physical commodities inventory
$
244.7

 
$
124.8