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Physical Commodities Inventory - Physical Commodities Inventory (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Inventory [Line Items] |  |
Physical Ag & Energy | $ 223.6 | $ 248.6
Precious metals - held by broker-dealer subsidiary | 359.8 | 359.9
Physical commodities inventory | 513.5 | 447.5
Physical Commodities Inventory - Precious Metals |  |
Inventory [Line Items] |  |
Precious metals - held by broker-dealer subsidiary | 136.3 | 111.2
Precious metals - held by non-broker-dealer subsidiaries | $ 153.6 | $ 87.7

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