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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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