XML 133 R116.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Regulatory Requirements and Subsidiary Dividend Restrictions - Customer Reserve Requirements (Details) - USD ($) $ in Millions | Oct. 04, 2022 | Sep. 30, 2022
--- | --- | ---
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit required |  | $ 1.6
Customer SRBA |  |
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit required |  | 3.5
Customer SRBA | Subsequent Event |  |
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit made | $ 3.9 |
PAB |  |
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit required |  | 10.3
PAB Reserve Requirement |  |
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit required |  | 10.3
PAB SRBA |  |
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit required |  | $ 12.9
PAB SRBA | Subsequent Event |  |
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve withdrawal | $ 1.1 |

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 cashreservedepositrequired + References No definition available. + Details
Name: | intl_CashReserveDepositRequired
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash Reserve Withdrawal + References No definition available. + Details
Name: | intl_CashReserveWithdrawal
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=116631393&loc=SL116631396-227033 + Details
Name: | us-gaap_CashReserveDepositRequiredAndMade
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | intl_ReserveRequirementAxis=intl_CustomerSRBAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | intl_ReserveRequirementAxis=intl_PABMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | intl_ReserveRequirementAxis=intl_PABReserveRequirementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | intl_ReserveRequirementAxis=intl_PABSRBAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |