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Physical Commodities Inventory Physical Commodities Inventory (Tables)
 12 Months Ended
Sep. 30, 2019
Inventory [Line Items]  
Schedule of Inventory, Current [Table Text Block]
(in millions)
September 30,
2019
 
September 30,
2018
Physical Ag & Energy(1)
$
144.8

 
$
114.7

Precious metals - held by broker-dealer subsidiary(2)
7.1

 
42.1

Precious metals - held by non-broker-dealer subsidiaries(3)
77.4

 
65.7

Physical commodities inventory
$
229.3

 
$
222.5