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Physical Commodities Inventory Physical Commodities Table (Tables)
 3 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(in millions)
December 31,
2019
 
September 30,
2019
Physical Ag & Energy(1)
$
176.4

 
$
144.8

Precious metals - held by broker-dealer subsidiary(2)
24.1

 
7.1

Precious metals - held by non-broker-dealer subsidiaries(3)
49.2

 
77.4

Physical commodities inventory
$
249.7

 
$
229.3