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Physical Commodities Inventory Physical Commodities Table (Tables)
 3 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(in millions)
December 31,
2016
 
September 30,
2016
Physical Ag & Energy(1)
$
137.5

 
$
65.9

Precious metals - held by broker-dealer subsidiary(2)
18.1

 
5.3

Precious metals - held by non-broker-dealer subsidiaries(3)
56.5

 
52.6

Physical commodities inventory
$
212.1

 
$
123.8