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Credit Facilities - Number of Credit Facilities (Details) | Dec. 31, 2018
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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