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Physical Commodities Inventory Physical Commodities Table (Tables)
 9 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(in millions)
June 30,
2017
 
September 30,
2016
Physical Ag & Energy(1)
$
108.6

 
$
65.9

Precious metals - held by broker-dealer subsidiary(2)
11.6

 
5.3

Precious metals - held by non-broker-dealer subsidiaries(3)
52.3

 
52.6

Physical commodities inventory
$
172.5

 
$
123.8