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Commitments and Contingencies - Contingencies and Litigation (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Mar. 31, 2015
Reinsurance Retention Policy, Excess Retention, Amount Reinsured $ 0.5us-gaap_ReinsuranceRetentionPolicyExcessRetentionAmountReinsured
Excess segregated funds returned 15.5intl_ExcessSegregatedFundsReturned
Excess segregated funds invested 21.9intl_ExcessSegregatedFundsInvested
Pre and Post Transfers of Funds - Sentinel 15.5intl_PreandPostTransfersofFundsSentinel
Post Transfers of Funds - Sentinel $ 14.5intl_PostTransfersofFundsSentinel