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Regulatory Requirements and Subsidiary Dividend Restrictions - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details)	Sep. 30, 2024 USD ($)
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	435,700,000
Minimum Requirement	243,500,000
StoneX Financial Ltd
Capital and Other Regulatory Requirements [Line Items]
Actual	433,800,000
Minimum Requirement	358,000,000.0
GAIN Capital Group, LLC
Capital and Other Regulatory Requirements [Line Items]
Actual	57,100,000
Minimum Requirement	29,700,000
StoneX Financial Pte. Ltd.
Capital and Other Regulatory Requirements [Line Items]
Actual	100,600,000
Minimum Requirement	22,300,000
StoneX Markets LLC
Capital and Other Regulatory Requirements [Line Items]
Actual	237,900,000
Minimum Requirement	$ 134,300,000

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Capital and Other Regulatory Requirements [Abstract]

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Capital and Other Regulatory Requirements [Line Items]

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Minimum amount of net capital required to be maintained by broker-dealer subsidiary to engage in security transaction, calculated under Aggregate Indebtedness Standard.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Rule 15c3-1
-Number 240
-Section 15c3-1
-Publisher SEC

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Amount of adjusted net capital of futures commission merchant (FCM) per Commodity Futures Trading Commission's (CFTC) requirement.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name CFTC Regulation
-Number 1
-Section 17
-Paragraph c
-Subparagraph (5)
-Publisher CFTC

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Amount of net capital required to be maintained by futures commission merchant (FCM) per Commodity Futures Trading Commission's (CFTC) requirement.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
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