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Credit Facilities (Tables) | 6 Months Ended
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Mar. 31, 2019
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, and outstanding borrowings on the facilities, as well as indebtedness on a promissory note as of March 31, 2019 and September 30, 2018:
(in millions) |  |  |  |  |  |  |  |
|  |  |  |  |  | Amounts Outstanding
| Borrower | Security | Renewal/Expiration Date |  | Total Commitment |  | March 31, 2019 |  | September 30, 2018
Committed Credit Facilities |  |  |  |  |  |  |  |
| Term Loan | Pledged shares of certain subsidiaries | February 22, 2022 |  | $ | 172.8 |  |  | $ | 172.8 |  |  | $ | — |
| Revolving Line of Credit | Pledged shares of certain subsidiaries | February 22, 2022 |  | 175.0 |  |  | 82.0 |  |  | 208.2 |
| INTL FCStone Inc. |  |  |  | 347.8 |  |  | 254.8 |  |  | 208.2 |
| INTL FCStone Financial Inc. | None | April 3, 2020 |  | 75.0 |  |  | — |  |  | — |
| FCStone Merchants Services, LLC | Certain commodities assets | November 1, 2019 |  | 232.5 |  |  | 171.5 |  |  | 128.0 |
| INTL FCStone Ltd. | None | January 31, 2020 |  | 50.0 |  |  | — |  |  | — |
|  |  |  |  | $ | 705.3 |  |  | $ | 426.3 |  |  | $ | 336.2 |
Uncommitted Credit Facilities |  |  |  |  |  |  |  |
| INTL FCStone Financial Inc. | Commodities warehouse receipts and certain pledged securities | n/a |  | n/a |  |  | — |  |  | 14.0 |
| INTL FCStone Ltd. | Commodities warehouse receipts | n/a |  | n/a |  |  | — |  |  | — |
| FCStone Merchant Services, LLC | Certain commodities assets | n/a |  | n/a |  |  | 1.5 |  |  | 3.8 |
Note Payable to Bank |  |  |  |  |  |  |  |
| Monthly installments, due March 2020 and secured by certain equipment |  |  |  | 0.8 |  |  | 1.2 |
Total outstanding borrowings |  |  |  |  |  | $ | 428.6 |  |  | $ | 355.2 |

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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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Namespace Prefix: | us-gaap_
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