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Commitments and Contingencies Commitments and Contingencies - Contingencies and Litigation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018
Excess segregated funds invested |  | $ 15.5
Pre and Post Transfers of Funds - Sentinel |  | $ 21.9
Litigation Settlement, Amount Awarded from Other Party | $ 1.9 |

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- Definition Excess segregated funds invested + References No definition available. + Details
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Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Pre and Post Transfers of Funds - Sentinel represents transfers or withdrawals of funds received by the Company and other FCMs within 90 days prior to the filing of the Sentinel bankruptcy petition, as well as avoidance of post-petition distributions and disallowance of the proof of claim filed by FCStone, LLC. + References No definition available. + Details
Name: | intl_PreandPostTransfersofFundsSentinel
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount awarded from other party in judgment or settlement of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration