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Credit Facilities - Credit Facilities (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Dec. 31, 2014
Sep. 30, 2014
Line of Credit Facility [Line Items]      
Line of Credit Facility, Amount Outstanding   $ 49.1us-gaap_LineOfCreditFacilityAmountOutstanding $ 22.5us-gaap_LineOfCreditFacilityAmountOutstanding
Senior unsecured notes   45.5us-gaap_SeniorNotes 45.5us-gaap_SeniorNotes
Debt and Capital Lease Obligations   94.6us-gaap_DebtAndCapitalLeaseObligations 68.0us-gaap_DebtAndCapitalLeaseObligations
Debt Instrument, Interest Rate, Stated Percentage   8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage  
Debt Instrument, Call Feature, Redemption Price Percentage of Principal   100.00%intl_DebtInstrumentCallFeatureRedemptionPricePercentageofPrincipal  
Debt Issuance Cost 1.7us-gaap_DebtIssuanceCosts    
Main line of credit facilities [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   270.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= intl_MainLineOfCreditFacilitiesMember		  
Line of Credit Facility, Current Borrowing Capacity   130us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= intl_MainLineOfCreditFacilitiesMember		  
HCO Syndicated line of credit facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   140.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= intl_HcoSyndicatedLineOfCreditFacilityMember		  
Line of Credit Facility, Amount Outstanding   31.0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= intl_HcoSyndicatedLineOfCreditFacilityMember		 15.0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= intl_HcoSyndicatedLineOfCreditFacilityMember
FCS Margin line of credit facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   75.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= intl_FcsMarginLineOfCreditFacilityMember		  
Line of Credit Facility, Amount Outstanding   0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= intl_FcsMarginLineOfCreditFacilityMember		 0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= intl_FcsMarginLineOfCreditFacilityMember
FMS Sub-note commodity line of credit facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   30.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= intl_FmsSubNoteCommodityLineOfCreditFacilityMember		  
Line of Credit Facility, Amount Outstanding   18.1us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= intl_FmsSubNoteCommodityLineOfCreditFacilityMember		 7.5us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= intl_FmsSubNoteCommodityLineOfCreditFacilityMember
INTL FCStone Ltd [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   25.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= intl_IntlFcstoneEuropeMember		  
Line of Credit Facility, Amount Outstanding   $ 0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= intl_IntlFcstoneEuropeMember		 $ 0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= intl_IntlFcstoneEuropeMember