XML 81 R116.htm IDEA: XBRL DOCUMENT v2.4.1.9
Undiscounted Closure Cost Estimates (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Asset Retirement Obligations [Line Items]    
Total closure cost estimate $ 390.8gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts [1] $ 355.2gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts [1]
South Africa    
Asset Retirement Obligations [Line Items]    
Total closure cost estimate 32.3gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts
/ us-gaap_StatementGeographicalAxis
= country_ZA		 33.3gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts
/ us-gaap_StatementGeographicalAxis
= country_ZA
Ghana    
Asset Retirement Obligations [Line Items]    
Total closure cost estimate 89.4gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts
/ us-gaap_StatementGeographicalAxis
= country_GH		 83.3gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts
/ us-gaap_StatementGeographicalAxis
= country_GH
Australia    
Asset Retirement Obligations [Line Items]    
Total closure cost estimate 212.7gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts
/ us-gaap_StatementGeographicalAxis
= country_AU		 196.6gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts
/ us-gaap_StatementGeographicalAxis
= country_AU
Peru    
Asset Retirement Obligations [Line Items]    
Total closure cost estimate $ 56.4gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts
/ us-gaap_StatementGeographicalAxis
= country_PE		 $ 42.0gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts
/ us-gaap_StatementGeographicalAxis
= country_PE
[1] Includes discounting of $90.7 million in the year ended December 31, 2014 (December 31, 2013: $86.0 million) in order to reconcile the gross closure cost estimate of $390.8 million (December 31, 2013: $355.2 million) to the provision for environmental rehabilitation of $300.1 million (December 31, 2013: $269.2 million)