XML 144 R123.htm IDEA: XBRL DOCUMENT
v3.25.3

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

X
- Definition Capital and Other Regulatory Requirements [Line Items] + References No definition available. + Details
Name: | intl_CapitalAndOtherRegulatoryRequirementsLineItems
Namespace Prefix: | intl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated + References No definition available. + Details
Name: | intl_CashAndSecuritiesSegregatedUnderCommodityExchangeActRegulationAmountRequiredToBeSegregated
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Secured funds + References No definition available. + Details
Name: | intl_SecuredFunds
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Secured Funds Required Under Commodity Exchange Act + References No definition available. + Details
Name: | intl_SecuredFundsRequiredUnderCommodityExchangeAct
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash and securities deposited in a special reserve account for the exclusive benefit of customers pursuant to the Commodity Exchange Act. + References No definition available. + Details
Name: | us-gaap_CashAndSecuritiesSegregatedUnderCommodityExchangeActRegulation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=intl_StoneXFinancialIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=intl_StoneXFinancialLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=intl_StoneXFinancialPteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=intl_R.J.OBrienAndAssociatesLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=intl_R.J.OBrienLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |