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Physical Commodities Inventory - Physical Commodities Inventory (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | ---
Inventory [Line Items] |  |
Physical Ag & Energy | $ 240.1 | $ 223.6
Precious metals - held by broker-dealer subsidiary | 351.6 | 359.8
Physical commodities inventory, net | 572.1 | 513.5
Physical Commodities Inventory - Precious Metals |  |
Inventory [Line Items] |  |
Precious metals - held by broker-dealer subsidiary | 111.5 | 136.3
Precious metals - held by non-broker-dealer subsidiaries | $ 220.5 | $ 153.6

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