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Credit Facilities (Tables) | 9 Months Ended
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Jun. 30, 2020
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 and the Senior Secured Notes as of the periods indicated:
(in millions) |  |  |  |  |  |  |  |
|  |  |  |  |  | Amounts Outstanding
| Borrower | Security | Renewal/Expiration Date |  | Total Commitment |  | June 30, 2020 |  | September 30, 2019
Committed Credit Facilities |  |  |  |  |  |  |  |
| Term Loan | (1) | February 22, 2022 |  | $ | 182.5 |  |  | $ | 182.0 |  | (3) | $ | 167.6 |
| Revolving Line of Credit | (1) | February 22, 2022 |  | 196.5 |  |  | 127.0 |  |  | 70.0 |
| Senior StoneX Group Inc. Committed Credit Facility |  |  |  | 379.0 |  |  | 309.0 |  |  | 237.6 |
| StoneX Financial Inc. | None | April 2, 2021 |  | 75.0 |  |  | — |  |  | — |
| FCStone Merchants Services, LLC | Certain commodities assets | January 29, 2022 |  | 260.0 |  |  | 162.4 |  |  | 128.5 |
| StoneX Financial Ltd. | None | September 14, 2020 |  | 25.0 |  |  | — |  |  | — |
|  |  |  |  | $ | 739.0 |  |  | $ | 471.4 |  |  | $ | 366.1 |
Uncommitted Credit Facilities |  |  |  |  |  |  |  |
| StoneX Financial Inc. | Commodities warehouse receipts and certain pledged securities | n/a |  | n/a |  |  | 24.4 |  |  | — |
| FCStone Merchant Services, LLC | Certain commodities assets | n/a |  | n/a |  |  | — |  |  | 3.4 |
| StoneX Group Inc. |  |  |  |  |  |  |  |
| Note Payable to Bank | Certain equipment |  |  |  |  | — |  |  | 0.4 |
| Senior Secured Notes | (2) |  |  |  |  | 336.9 |  | (3) | — |
Total outstanding borrowings |  |  |  |  |  | $ | 832.7 |  |  | $ | 369.9 |

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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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