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Credit Facilities - Number of Credit Facilities (Details) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Repayments of Unsecured Debt | $ 0.0 | $ 45.5
Number of credit facilities | 4 |

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- Definition Number of credit facilities available to the company. + References No definition available. + Details
Name: | intl_NumberOfCreditFacilities
Namespace Prefix: | intl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfUnsecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration