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Physical Commodities Inventory - Physical Commodities Inventory by CIP and Finished (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Inventory [Line Items] |  |
Physical Ag & Energy(1) | $ 153.8 | $ 144.8
Precious metals - held by non-broker-dealer subsidiaries(3) | 173.6 | 151.9
Physical commodities inventory | 270.2 | 229.3
Physical commodities inventory - precious metals [Member] |  |
Inventory [Line Items] |  |
Precious metals - held by non-broker-dealer subsidiaries(3) | 19.8 | 7.1
Finished commodities | $ 96.6 | $ 77.4

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