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Credit Facilities (Tables) | 6 Months Ended
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Mar. 31, 2017
Credit Facilities [Abstract] |
Schedule of Debt [Table Text Block] | The following table sets forth a listing of credit facilities, the committed amounts as of March 31, 2017 on the facilities, and outstanding borrowings on the facilities as well as indebtedness on a promissory note and on senior notes as of March 31, 2017 and September 30, 2016:
(in millions) |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  | Amounts Outstanding
| Borrower | Security | Renewal / Expiration Date |  | Total Commitment |  | March 31, 2017 |  | September 30, 2016
| INTL FCStone Inc. | Pledged shares of certain subsidiaries | March 18, 2019 |  | $ | 247.0 |  |  | $ | 175.0 |  |  | $ | 136.5 |
| INTL FCStone Financial Inc. | None | April 5, 2018 |  | 75.0 |  |  | — |  |  | — |
| INTL FCStone Financial Inc. | Commodity warehouse receipts | n/a |  | — |  |  | — |  |  | — |
| FCStone Merchants Services, LLC | Certain commodities assets | May 1, 2018 |  | 100.0 |  |  | 86.0 |  |  | 43.5 |
| INTL FCStone Ltd | None | October 27, 2017 |  | 25.0 |  |  | — |  |  | — |
| INTL FCStone Ltd | Commodity warehouse receipts | n/a |  | — |  |  | — |  |  | — |
| Sterne, Agee & Leach, Inc. | Certain pledged securities | n/a |  | — |  |  | — |  |  | — |
|  |  |  |  | $ | 447.0 |  |  | 261.0 |  |  | 180.0 |
Note Payable to Bank |  |  |  |  |  |  |  |
| Monthly installments, due March 2020 and secured by certain equipment |  |  |  | 2.4 |  |  | 2.8 |
Senior Unsecured Notes |  |  |  |  |  |  |  |
| 8.50% senior notes, due July 30, 2020 (redeemed on October 15, 2016) |  |  |  | — |  |  | 44.5 |
Total indebtedness |  |  |  |  |  | $ | 263.4 |  |  | $ | 227.3 |

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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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