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Regulatory Requirements and Subsidiary Dividend Restrictions - Regulatory Capital Requirements - Narrative (Details) $ in Millions	Sep. 30, 2025 USD ($)
StoneX Financial Inc.
Capital and Other Regulatory Requirements [Line Items]
Cash and securities segregated under commodity exchange act regulation	$ 7,244.8
Minimum regulatory requirement	7,159.6
Secured funds	260.4
Secured funds required under commodity exchange act	247.1
StoneX Financial Ltd
Capital and Other Regulatory Requirements [Line Items]
Cash and securities segregated under commodity exchange act regulation	1,874.4
Minimum regulatory requirement	1,853.8
StoneX Financial Pte. Ltd.
Capital and Other Regulatory Requirements [Line Items]
Cash and securities segregated under commodity exchange act regulation	1,062.6
Minimum regulatory requirement	1,049.1
R.J. O’Brien & Associates LLC
Capital and Other Regulatory Requirements [Line Items]
Cash and securities segregated under commodity exchange act regulation	6,293.6
Minimum regulatory requirement	6,015.7
Secured funds	280.8
Secured funds required under commodity exchange act	248.2
R.J. O’Brien Limited
Capital and Other Regulatory Requirements [Line Items]
Cash and securities segregated under commodity exchange act regulation	460.3
Minimum regulatory requirement	$ 460.0