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Physical Commodities Inventory - Physical Commodities Inventory (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Inventory [Line Items] |  |
Physical Ag & Energy | $ 317.7 | $ 248.6
Precious metals - held by broker-dealer subsidiary | 404.7 | 359.9
Physical commodities inventory, net | 523.9 | 447.5
Physical Commodities Inventory - Precious Metals |  |
Inventory [Line Items] |  |
Precious metals - held by broker-dealer subsidiary | 87.0 | 111.2
Precious metals - held by non-broker-dealer subsidiaries | $ 119.2 | $ 87.7

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