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Physical Commodities Inventory Physical Commodities Table (Tables) | 9 Months Ended
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Jun. 30, 2019
Inventory Disclosure [Abstract] |
Schedule of Inventory, Current [Table Text Block] |
(in millions) | June 30, 2019 |  | September 30, 2018
Physical Ag & Energy(1) | $ | 147.6 |  |  | $ | 114.7 |
Precious metals - held by broker-dealer subsidiary(2) | 22.3 |  |  | 42.1 |
Precious metals - held by non-broker-dealer subsidiaries(3) | 177.9 |  |  | 65.7 |
Physical commodities inventory | $ | 347.8 |  |  | $ | 222.5 |

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