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Regulatory Capital Requirements (Tables)
 3 Months Ended
Dec. 31, 2023
Capital and Other Regulatory Requirements [Abstract]  
Schedule of Subsidiaries with Minimum Regulatory Requirements The following table details those subsidiaries with minimum capital regulatory requirements in excess of $10.0 million along with the actual balance maintained as of that date.
(in millions) As of December 31, 2023
SubsidiaryRegulatory AuthorityActualMinimum
Requirement
StoneX Financial Inc.SEC and CFTC$389.0 $227.9 
StoneX Financial Ltd.FCA$456.9 $358.0 
Gain Capital Group, LLCCFTC and NFA$54.0 $29.6 
StoneX Financial Pte. Ltd.MAS$79.3 $23.8 
StoneX Markets LLCCFTC and NFA$220.4 $138.3