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Physical Commodities Inventory Physical Commodities Inventory (Tables)
 12 Months Ended
Sep. 30, 2018
Inventory [Line Items]  
Schedule of Inventory, Current [Table Text Block]
(in millions)
September 30,
2018
 
September 30,
2017
Physical Ag & Energy(1)
$
114.7

 
$
65.1

Precious metals - held by broker-dealer subsidiary(2)
42.1

 
13.3

Precious metals - held by non-broker-dealer subsidiaries(3)
65.7

 
46.4

Physical commodities inventory
$
222.5

 
$
124.8