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v3.19.3.a.u2

Credit Facilities (Tables) | 3 Months Ended
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Dec. 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 the periods indicated:
(in millions) |  |  |  |  |  |  |  |
|  |  |  |  |  | Amounts Outstanding
| Borrower | Security | Renewal/Expiration Date |  | Total Commitment |  | December 31, 2019 |  | September 30, 2019
Committed Credit Facilities |  |  |  |  |  |  |  |
| Term Loan | (1) | February 22, 2022 |  | $ | 187.5 |  |  | $ | 186.7 |  | (2) | $ | 167.6 |
| Revolving Line of Credit | (1) | February 22, 2022 |  | 196.5 |  |  | — |  |  | 70.0 |
| INTL FCStone Inc. |  |  |  | 384.0 |  |  | 186.7 |  |  | 237.6 |
| INTL FCStone Financial Inc. | None | April 3, 2020 |  | 75.0 |  |  | — |  |  | — |
| FCStone Merchants Services, LLC | Certain commodities assets | January 29, 2022 |  | 260.0 |  |  | 121.0 |  |  | 128.5 |
| INTL FCStone Ltd. | None | April 14, 2020 |  | 50.0 |  |  | — |  |  | — |
|  |  |  |  | $ | 769.0 |  |  | $ | 307.7 |  |  | $ | 366.1 |
Uncommitted Credit Facilities |  |  |  |  |  |  |  |
| INTL FCStone Financial Inc. | Commodities warehouse receipts and certain pledged securities | n/a |  | n/a |  |  | 16.7 |  |  | — |
| FCStone Merchant Services, LLC | Certain commodities assets | n/a |  | n/a |  |  | 0.7 |  |  | 3.4 |
Note Payable to Bank |  |  |  |  |  |  |  |
| Monthly installments, due March 2020 and secured by certain equipment |  |  |  | 0.3 |  |  | 0.4 |
Total outstanding borrowings |  |  |  |  |  | $ | 325.4 |  |  | $ | 369.9 |

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- Definition Credit Facilities [Abstract] + References No definition available. + Details
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Namespace Prefix: | intl_
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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_
Data Type: | nonnum:textBlockItemType
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Period Type: | duration