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Regulatory Requirements and Subsidiary Dividend Restrictions - Regulatory Capital Requirements - Narrative (Details) $ in Millions	Sep. 30, 2024 USD ($)
StoneX Financial Inc.
Capital and Other Regulatory Requirements [Line Items]
Cash and securities segregated under commodity exchange act regulation	$ 5,762.6
Secured funds	262.5
Minimum regulatory requirement	5,690.4
Secured funds required under commodity exchange act	250.5
StoneX Financial Ltd
Capital and Other Regulatory Requirements [Line Items]
Cash and securities segregated under commodity exchange act regulation	1,292.2
Minimum regulatory requirement	1,230.1
StoneX Financial Pte. Ltd.
Capital and Other Regulatory Requirements [Line Items]
Cash and securities segregated under commodity exchange act regulation	973.6
Minimum regulatory requirement	$ 958.4

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Capital and Other Regulatory Requirements [Line Items]

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Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated

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Secured funds

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Cash and securities deposited in a special reserve account for the exclusive benefit of customers pursuant to the Commodity Exchange Act.

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