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Physical Commodities Inventory - Physical Commodities Inventory by CIP and Finished (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Inventory [Line Items] |  |  |
Physical Ag & Energy(1) | $ 139.5 |  | $ 65.9
Precious metals - held by non-broker-dealer subsidiaries(3) |  | $ 117.8 | 71.2
Physical commodities inventory | 181.7 |  | 123.8
Physical commodities inventory - precious metals [Member] |  |  |
Inventory [Line Items] |  |  |
Precious metals - held by non-broker-dealer subsidiaries(3) | 17.0 |  | 5.3
Finished commodities | $ 25.2 |  | $ 52.6

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