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Capital and Other Regulatory Requirements (Tables) | 6 Months Ended
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Mar. 31, 2021
Capital and Other Regulatory Requirements [Abstract] |
Subsidiaries with Minimum Regulatory Requirements | The following table details those subsidiaries with minimum regulatory requirements in excess of $5 million along with the actual balance maintained as of that date.
(in millions) |  |  | As of March 31, 2021
Subsidiary | Regulatory Authority |  | Actual |  | Minimum Requirement
StoneX Financial Inc. | SEC and CFTC |  | $ | 288.4 |  |  | $ | 163.6 |
StoneX Financial Ltd. | Financial Conduct Authority ("FCA") |  | $ | 375.8 |  |  | $ | 222.4 |
Gain Capital Group, LLC | CFTC and NFA |  | $ | 69.7 |  |  | $ | 31.6 |
Gain Capital U.K., Ltd. | FCA |  | $ | 106.6 |  |  | $ | 31.5 |

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- Definition Capital and Other Regulatory Requirements [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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