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Regulatory Capital Requirements (Tables)

9 Months Ended

Jun. 30, 2025

Capital and Other Regulatory Requirements [Abstract]

Schedule of Subsidiaries with Minimum Regulatory Requirements

The following table details those subsidiaries with minimum regulatory requirements in excess of $10.0 million along with the actual balance maintained as of that date.

(in millions)									As of June 30, 2025
Subsidiary			Regulatory Authority						Actual						Minimum Requirement
StoneX Financial Inc.			SEC and CFTC						$	490.7					$	297.8
StoneX Financial Ltd.			FCA						$	560.4					$	471.1
Gain Capital Group, LLC			CFTC and NFA						$	69.0					$	29.7
StoneX Financial Pte. Ltd.			MAS						$	118.1					$	26.9
StoneX Markets LLC			CFTC and NFA						$	252.6					$	150.1

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- Definition

Capital and Other Regulatory Requirements [Abstract]

+ References

No definition available.

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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
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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