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Physical Commodities Inventory Physical Commodities Inventory (Tables)
 12 Months Ended
Sep. 30, 2017
Inventory [Line Items]  
Schedule of Inventory, Current [Table Text Block]
(in millions)
September 30,
2017
 
September 30,
2016
Physical Ag & Energy(1)
$
65.1

 
$
65.9

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

 
5.3

Precious metals - held by non-broker-dealer subsidiaries(3)
46.4

 
52.6

Physical commodities inventory
$
124.8

 
$
123.8