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Physical Commodities Inventory (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Inventory [Line Items] |  |
Physical agriculture and energy | $ 255.1 | $ 169.0
Precious metals - held by broker-dealer subsidiary | 503.1 | 376.6
Physical commodities inventory, net | 796.2 | 681.1
Physical Commodities Inventory - Precious Metals |  |
Inventory [Line Items] |  |
Precious metals - held by broker-dealer subsidiary | 248.0 | 207.6
Precious metals - held by non-broker-dealer subsidiaries | 293.1 | $ 304.5
Raw materials | 7.5 |
Work in process | $ 26.1 |

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