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Regulatory Requirements and Subsidiary Dividend Restrictions - Minimum Regulatory Net Capital (Details) | Sep. 30, 2023 USD ($)
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Capital and Other Regulatory Requirements [Abstract] |
Adjusted net capital | $ 10,000,000
StoneX Financial Inc. |
Capital and Other Regulatory Requirements [Abstract] |
Adjusted net capital | 1,500,000
Capital and Other Regulatory Requirements [Line Items] |
Actual | 353,000,000.0
Minimum Requirement | 220,500,000
StoneX Financial Ltd. |
Capital and Other Regulatory Requirements [Line Items] |
Actual | 458,500,000
Minimum Requirement | 358,000,000.0
Gain Capital Group, LLC |
Capital and Other Regulatory Requirements [Line Items] |
Actual | 50,100,000
Minimum Requirement | 29,300,000
StoneX Financial Pte. Ltd. |
Capital and Other Regulatory Requirements [Line Items] |
Actual | 76,500,000
Minimum Requirement | 24,400,000
StoneX Markets LLC |
Capital and Other Regulatory Requirements [Line Items] |
Actual | 221,300,000
Minimum Requirement | $ 122,100,000

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- Definition Capital and Other Regulatory Requirements [Abstract] + References No definition available. + Details
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- Definition Minimum amount of net capital required to be maintained by broker-dealer subsidiary to engage in security transaction, calculated under Aggregate Indebtedness Standard. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Rule 15c3-1 -Number 240 -Section 15c3-1 -Publisher SEC + Details
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- Definition Amount of adjusted net capital of futures commission merchant (FCM) per Commodity Futures Trading Commission's (CFTC) requirement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Rule 17 -Number 1 -Section 17 -Paragraph (c) -Subparagraph (5) -Publisher CFTC + Details
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- Definition Amount of net capital required to be maintained by futures commission merchant (FCM) per Commodity Futures Trading Commission's (CFTC) requirement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Rule 17 -Number 1 -Section 17 -Paragraph (a) -Subparagraph (1)(i) -Publisher CFTC + Details
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