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Credit Facilities (Tables) | 3 Months Ended
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Dec. 31, 2017
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 December 31, 2017 and September 30, 2017:
(in millions) |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  | Amounts Outstanding
| Borrower | Security | Renewal / Expiration Date |  | Total Commitment |  | December 31, 2017 |  | September 30, 2017
Committed Credit Facilities |  |  |  |  |  |  |  |
| INTL FCStone Inc. | Pledged shares of certain subsidiaries | March 18, 2019 |  | $ | 262.0 |  |  | $ | 210.0 |  |  | $ | 150.0 |
| INTL FCStone Financial, Inc. | None | April 5, 2018 |  | 75.0 |  |  | 36.5 |  |  | — |
| FCStone Merchants Services, LLC | Certain commodities assets | May 1, 2018 |  | 170.0 |  |  | 103.5 |  |  | 44.2 |
| INTL FCStone Ltd. | None | November 7, 2018 |  | 25.0 |  |  | — |  |  | — |
|  |  |  |  | $ | 532.0 |  |  | 350.0 |  |  | 194.2 |
Uncommitted Credit Facilities |  |  |  |  |  |  |  |
| INTL FCStone Financial, Inc. | Commodities warehouse receipts and certain pledged securities | n/a |  | $ | — |  |  | $ | 71.1 |  |  | $ | 34.0 |
| INTL FCStone Ltd. | Commodities warehouse receipts | n/a |  | $ | — |  |  | $ | — |  |  | $ | — |
Note Payable to Bank |  |  |  |  |  |  |  |
| Monthly installments, due March 2020 and secured by certain equipment |  |  |  | 1.8 |  |  | 2.0 |
Total indebtedness |  |  |  |  |  | $ | 422.9 |  |  | $ | 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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