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Physical Commodities Inventory (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Inventory [Line Items] |  |
Physical Ag & Energy | $ 150.7 | $ 146.2
Precious metals - held by broker-dealer subsidiary | 344.5 | 386.5
Physical commodities inventory, net | 587.4 | 537.3
Physical Commodities Inventory - Precious Metals |  |
Inventory [Line Items] |  |
Precious metals - held by broker-dealer subsidiary | 193.8 | 240.3
Precious metals - held by non-broker-dealer subsidiaries | $ 242.9 | $ 150.8

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