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Credit Facilities (Tables) | 6 Months Ended
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Mar. 31, 2018
Credit Facilities [Abstract] |
Schedule of Debt [Table Text Block] | The following table sets forth a listing of credit facilities, the current committed amounts as of the report date on the facilities, outstanding borrowings on the facilities, as well as indebtedness on a promissory note as of March 31, 2018 and September 30, 2017:
(in millions) |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  | Amounts Outstanding
| Borrower | Security | Renewal / Expiration Date |  | Total Commitment |  | March 31, 2018 |  | September 30, 2017
Committed Credit Facilities |  |  |  |  |  |  |  |
| INTL FCStone Inc. | Pledged shares of certain subsidiaries | March 18, 2019 |  | $ | 262.0 |  |  | $ | 143.4 |  |  | $ | 150.0 |
| INTL FCStone Financial, Inc. | None | April 4, 2019 |  | 75.0 |  |  | 9.5 |  |  | — |
| FCStone Merchants Services, LLC | Certain commodities assets | November 1, 2019 |  | 232.5 |  |  | 138.0 |  |  | 44.2 |
| INTL FCStone Ltd. | None | November 7, 2018 |  | 25.0 |  |  | — |  |  | — |
|  |  |  |  | $ | 594.5 |  |  | 290.9 |  |  | 194.2 |
Uncommitted Credit Facilities |  |  |  |  |  |  |  |
| INTL FCStone Financial, Inc. | Commodities warehouse receipts and certain pledged securities | n/a |  | $ | — |  |  | 48.0 |  |  | 34.0 |
| INTL FCStone Ltd. | Commodities warehouse receipts | n/a |  | $ | — |  |  | — |  |  | — |
Note Payable to Bank |  |  |  |  |  |  |  |
| Monthly installments, due March 2020 and secured by certain equipment |  |  |  | 1.6 |  |  | 2.0 |
Total indebtedness |  |  |  |  |  | $ | 340.5 |  |  | $ | 230.2 |

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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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