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Assets and Liabilities, at Fair Value - Suriwongse Bonds (Details) $ in Millions | Sep. 30, 2016 USD ($)
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Assets and Liabilities, at Fair Value [Abstract] |
Suriwongse Debt Investment Balance | $ 3.0

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- Definition Assets and Liabilities, at Fair Value [Abstract] + References No definition available. + Details
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Namespace Prefix: | intl_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Suriwongse Debt Investment Balance - Investment in Suriwongse hotel + References No definition available. + Details
Name: | intl_SuriwongseDebtInvestmentBalance
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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