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Physical Commodities Inventory Physical Commodities Table (Tables)
 9 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(in millions)
June 30,
2020
 
September 30,
2019
Physical Ag & Energy(1)
$
153.8

 
$
144.8

Precious metals - held by broker-dealer subsidiary(2)
19.8

 
7.1

Precious metals - held by non-broker-dealer subsidiaries(3)
96.6

 
77.4

Physical commodities inventory
$
270.2

 
$
229.3