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Physical Commodities Inventory Physical Commodities Inventory (Tables) | 12 Months Ended
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Sep. 30, 2018
Inventory [Line Items] |
Schedule of Inventory, Current [Table Text Block] |
(in millions) | September 30, 2018 |  | September 30, 2017
Physical Ag & Energy(1) | $ | 114.7 |  |  | $ | 65.1 |
Precious metals - held by broker-dealer subsidiary(2) | 42.1 |  |  | 13.3 |
Precious metals - held by non-broker-dealer subsidiaries(3) | 65.7 |  |  | 46.4 |
Physical commodities inventory | $ | 222.5 |  |  | $ | 124.8 |

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