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Credit Facilities (Tables) | 9 Months Ended
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Jun. 30, 2016
Credit Facilities [Abstract] |
Schedule of Debt [Table Text Block] | The following table sets forth a listing of credit facilities, the committed amounts as of June 30, 2016 on the facilities, and outstanding borrowings on the facilities as well as indebtedness on a promissory note and on senior notes as of June 30, 2016 and September 30, 2015:
(in millions) |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  | Amounts Outstanding
| Borrower | Security | Renewal / Expiration Date |  | Total Commitment |  | June 30, 2016 |  | September 30, 2015
| INTL FCStone Inc. | Pledged shares of certain subsidiaries | March 18, 2019 |  | $ | 220.0 |  |  | $ | 170.0 |  |  | $ | 28.0 |
| INTL FCStone Financial Inc. | None | April 6, 2017 |  | 75.0 |  |  | — |  |  | — |
| INTL FCStone Financial Inc. | Commodity warehouse receipts | n/a |  | — |  |  | — |  |  | — |
| FCStone Merchants | Certain commodities assets | May 1, 2017 |  | 65.0 |  |  | 38.6 |  |  | 10.0 |
| INTL FCStone Ltd | None | October 31, 2016 |  | 25.0 |  |  | — |  |  | — |
|  |  |  |  | $ | 385.0 |  |  | 208.6 |  |  | 38.0 |
Note Payable to Bank |  |  |  |  |  |  |  |
| Monthly installments, due March 2020 and secured by certain equipment |  |  |  | 3.0 |  |  | 3.6 |
Senior Unsecured Notes |  |  |  |  |  |  |  |
| 8.50% senior notes, due July 30, 2020 |  |  |  |  | 45.5 |  |  | 45.5 |
Total indebtedness |  |  |  |  |  | $ | 257.1 |  |  | $ | 87.1 |

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- Definition Credit Facilities [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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