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Regulatory Requirements and Subsidiary Dividend Restrictions - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) | Sep. 30, 2025 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 | 519,100,000
Minimum Requirement | 362,800,000
StoneX Financial Ltd |
Capital and Other Regulatory Requirements [Line Items] |
Actual | 557,400,000
Minimum Requirement | 457,100,000
GAIN Capital Group, LLC |
Capital and Other Regulatory Requirements [Line Items] |
Actual | 65,800,000
Minimum Requirement | 30,400,000
StoneX Financial Pte. Ltd. |
Capital and Other Regulatory Requirements [Line Items] |
Actual | 127,400,000
Minimum Requirement | 26,300,000
StoneX Markets LLC |
Capital and Other Regulatory Requirements [Line Items] |
Actual | 252,500,000
Minimum Requirement | 154,400,000
R.J. O’Brien & Associates LLC |
Capital and Other Regulatory Requirements [Line Items] |
Actual | 367,400,000
Minimum Requirement | 275,800,000
R.J. O’Brien Limited |
Capital and Other Regulatory Requirements [Line Items] |
Actual | 39,100,000
Minimum Requirement | $ 20,300,000

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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 CFTC Regulation -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 CFTC Regulation -Number 1 -Section 17 -Paragraph a -Subparagraph (1)(i) -Publisher CFTC + Details
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