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Deferred Income and Mining Tax Liabilities and Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income and mining tax liabilities    
Mining assets $ 971.4us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 1,054.5us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Investments held by environmental trust funds 2.7gfi_DeferredTaxLiabilitiesEnvironmentalTrustFunds 2.7gfi_DeferredTaxLiabilitiesEnvironmentalTrustFunds
Inventory 22.7us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts 18.2us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts
Other 18.1us-gaap_DeferredTaxLiabilitiesOther 19.5us-gaap_DeferredTaxLiabilitiesOther
Gross deferred income and mining tax liabilities 1,014.90us-gaap_DeferredIncomeTaxLiabilities 1,094.90us-gaap_DeferredIncomeTaxLiabilities
Provisions, including rehabilitation accruals (118.8)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals (103.7)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Tax losses (162.8)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards (159.8)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Unredeemed capital expenditure (867.6)us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther (883.8)us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther
Other (7.1)us-gaap_DeferredTaxAssetsOther (4.1)us-gaap_DeferredTaxAssetsOther
Gross deferred income and mining tax assets (1,156.3)us-gaap_DeferredTaxAssetsGross (1,151.4)us-gaap_DeferredTaxAssetsGross
Valuation allowance for deferred tax assets 386.8us-gaap_DeferredTaxAssetsValuationAllowance 330.2us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred income and mining tax assets (769.5)us-gaap_DeferredTaxAssetsNet (821.2)us-gaap_DeferredTaxAssetsNet
Total deferred income and mining tax liabilities 245.4us-gaap_DeferredTaxLiabilities 273.7us-gaap_DeferredTaxLiabilities
Less: short-term portion of deferred income and mining tax liabilities (10.3)us-gaap_DeferredTaxLiabilitiesCurrent (16.0)us-gaap_DeferredTaxLiabilitiesCurrent
Less: short-term portion of deferred income and mining tax assets 6.9us-gaap_DeferredTaxAssetsNetCurrent 29.0us-gaap_DeferredTaxAssetsNetCurrent
Long-term portion of deferred income and mining taxes 242.0us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 286.7us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Long-term liabilities (252.9)us-gaap_DeferredTaxLiabilitiesNoncurrent (309.3)us-gaap_DeferredTaxLiabilitiesNoncurrent
Long-term assets 10.9us-gaap_DeferredTaxAssetsNetNoncurrent 22.6us-gaap_DeferredTaxAssetsNetNoncurrent
Long-term portion of deferred income and mining taxes $ (242.0)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent $ (286.7)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent