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Accounts Payable and Provisions (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Trade payables $ 170.2us-gaap_AccountsPayableTradeCurrent $ 141.2us-gaap_AccountsPayableTradeCurrent
Accruals 212.1us-gaap_AccruedLiabilitiesCurrent 173.8us-gaap_AccruedLiabilitiesCurrent
Payroll and other compensation 48.9us-gaap_AccruedSalariesCurrent 55.1us-gaap_AccruedSalariesCurrent
Leave pay accrual 37.9us-gaap_AccruedVacationCurrent 42.9us-gaap_AccruedVacationCurrent
Other 27.7us-gaap_OtherAccountsPayableAndAccruedLiabilities 15.1us-gaap_OtherAccountsPayableAndAccruedLiabilities
Accounts payable and provisions 498.5us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 445.0us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
South Deep Gold Mine    
Short-term Debt [Line Items]    
Short-term portion of the South Deep Dividend liability 1.7us-gaap_DividendsPayableCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= gfi_SouthDeepGoldMineMember
1.9us-gaap_DividendsPayableCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= gfi_SouthDeepGoldMineMember
Yilgarn South    
Short-term Debt [Line Items]    
Stamp duty due on acquisition of assets   $ 15.0gfi_StampDutyDueOnAcquisitionOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= gfi_YilgarnSouthMember