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Physical Commodities Inventory - Physical Commodities Inventory by CIP and Finished (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Inventory [Line Items] |  |  |
Agricultural Related Inventory | $ 144.8 | $ 114.7 |
Inventory, Net | 229.3 | 222.5 |
Physical commodities inventory at fair value |  | 156.9 | $ 156.9
Physical commodities inventory - precious metals [Member] |  |  |
Inventory [Line Items] |  |  |
Physical commodities inventory at fair value | 7.1 | 42.1 |
Inventory, Finished Goods, Net of Reserves | $ 77.4 | $ 65.7 |

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