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Segment Analysis - Narrative (Details) | 3 Months Ended
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Dec. 31, 2020 employee country market currency
Segment Reporting Information [Line Items] |
Number of employees (more than) | employee | 2,900
Number of countries in which entity operates (more than) | 180
Retail Segment |
Segment Reporting Information [Line Items] |
Number of countries in which entity operates (more than) | 130
Number of global financial markets (over) | market | 15,000
Global Payments |
Segment Reporting Information [Line Items] |
Number of countries in which entity operates (more than) | 170
Number of different types of foreign currencies (more than) | currency | 140

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of different types of foreign currencies the company trades + References No definition available. + Details
Name: | intl_NumberOfDifferentTypesOfForeignCurrencies
Namespace Prefix: | intl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Global Financial Markets + References No definition available. + Details
Name: | intl_NumberOfGlobalFinancialMarkets
Namespace Prefix: | intl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=intl_RetailSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=intl_GlobalPaymentsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |