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Physical Commodities Inventory - Physical Commodities Inventory by CIP and Finished (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | ---
Inventory [Line Items] |  |
Physical Ag & Energy(1) | $ 137.5 | $ 65.9
Precious metals - held by non-broker-dealer subsidiaries(3) | 129.8 | 71.2
Physical commodities inventory | 212.1 | 123.8
Physical commodities inventory - precious metals [Member] |  |
Inventory [Line Items] |  |
Precious metals - held by non-broker-dealer subsidiaries(3) | 18.1 | 5.3
Finished commodities | $ 56.5 | $ 52.6

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