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Segment Results and Assets (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Operating costs (excluding amortization and depreciation) $ 1,684.9gfi_IfrsOperatingCosts [1],[2] $ 1,678.7gfi_IfrsOperatingCosts [1],[3] $ 1,673.8gfi_IfrsOperatingCosts [1],[4]
Corporate Expenditure [Member]      
Segment Reporting Information [Line Items]      
Operating costs (excluding amortization and depreciation) 27.3gfi_IfrsOperatingCosts
/ us-gaap_IncomeStatementLocationAxis
= gfi_CorporateExpenditureMember
39.4gfi_IfrsOperatingCosts
/ us-gaap_IncomeStatementLocationAxis
= gfi_CorporateExpenditureMember
38.2gfi_IfrsOperatingCosts
/ us-gaap_IncomeStatementLocationAxis
= gfi_CorporateExpenditureMember
Environmental Rehabilitation [Member]      
Segment Reporting Information [Line Items]      
Operating costs (excluding amortization and depreciation) 15.4gfi_IfrsOperatingCosts
/ us-gaap_IncomeStatementLocationAxis
= gfi_EnvironmentalRehabilitationMember
10.4gfi_IfrsOperatingCosts
/ us-gaap_IncomeStatementLocationAxis
= gfi_EnvironmentalRehabilitationMember
13.9gfi_IfrsOperatingCosts
/ us-gaap_IncomeStatementLocationAxis
= gfi_EnvironmentalRehabilitationMember
Employee Termination Costs [Member]      
Segment Reporting Information [Line Items]      
Operating costs (excluding amortization and depreciation) $ 42.2gfi_IfrsOperatingCosts
/ us-gaap_IncomeStatementLocationAxis
= gfi_EmployeeTerminationCostsMember
$ 35.5gfi_IfrsOperatingCosts
/ us-gaap_IncomeStatementLocationAxis
= gfi_EmployeeTerminationCostsMember
$ 6.1gfi_IfrsOperatingCosts
/ us-gaap_IncomeStatementLocationAxis
= gfi_EmployeeTerminationCostsMember
[1] This caption is based on captions used in the IFRS financial statements and does not reflect the US GAAP captions per the consolidated statement of operations.
[2] Operating costs (excluding amortization and depreciation) for continuing operations for management reporting purposes includes: Corporate expenditure - $27.3 million, Accretion expense on provision for environmental rehabilitation - $15.4 million and Employee termination costs - $42.2 million, which are not included in production costs under U.S. GAAP. In addition, gold inventory change is included in production costs under U.S. GAAP.
[3] Operating costs (excluding amortization and depreciation) for continuing operations for management reporting purposes includes: Corporate expenditure - $39.4 million, Accretion expense on provision for environmental rehabilitation - $10.4 million and Employee termination costs - $35.5 million, which are not included in production costs under U.S. GAAP. In addition, gold inventory change is included in production costs under U.S. GAAP.
[4] Operating costs (excluding amortization and depreciation) for continuing operations for management reporting purposes includes: Corporate expenditure - $38.2 million, Accretion expense on provision for environmental rehabilitation - $13.9 million and Employee termination costs - $6.1 million, which are not included in production costs under U.S. GAAP. In addition, gold inventory change is included in production costs under U.S. GAAP.