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Physical Commodities Inventory - Physical Commodities Inventory (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Inventory [Line Items] |  |
Physical Ag & Energy | $ 201.5 | $ 144.8
Precious metals - held by broker -dealer subsidiary | 215.7 | 151.9
Physical commodities inventory | 281.1 | 229.3
Physical Commodities Inventory - Precious Metals [Member] |  |
Inventory [Line Items] |  |
Precious metals - held by broker -dealer subsidiary | 14.2 | 7.1
Precious metals - held by non -broker -dealer subsidiaries | $ 65.4 | $ 77.4

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