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Combined Aggregate Maturities of Short and Long-Terms Loans (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Short Term And Long Term Debt Maturities Repayments Of Principal In Next Twelve Months $ 140.2us-gaap_DebtCurrent $ 121.5us-gaap_DebtCurrent
Long term and Short term debt maturities, year two 21.6us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo 750.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Long term and Short term debt maturities, year three 628.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
Long term and Short term debt maturities, year four 129.8us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour 53.5us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Long term and Short term debt maturities, year five and thereafter 991.3gfi_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFiveAndThereafter 1,135.1gfi_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFiveAndThereafter
Long term and Short term debt $ 1,910.9us-gaap_DebtLongtermAndShorttermCombinedAmount $ 2,060.1us-gaap_DebtLongtermAndShorttermCombinedAmount