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Commitment (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Line Items]    
Commitments $ 1,257.3 $ 1,243.1
Other guarantees 0.5 1.7
Capital Expenditure -Authorized | South Africa | Driefontein Kloof Complex
    
Commitments and Contingencies Disclosure [Line Items]    
Commitments 401.0 373.7
Capital Expenditure -Authorized | South Africa | Beatrix
    
Commitments and Contingencies Disclosure [Line Items]    
Commitments 104.8 87.1
Capital Expenditure -Authorized | South Africa | South Deep Gold Mine
    
Commitments and Contingencies Disclosure [Line Items]    
Commitments 446.3 433.1
Capital Expenditure -Authorized | Ghana | Tarkwa Mine
    
Commitments and Contingencies Disclosure [Line Items]    
Commitments 110.9 126.5
Capital Expenditure -Authorized | Ghana | Damang
    
Commitments and Contingencies Disclosure [Line Items]    
Commitments 9.8 16.9
Capital Expenditure -Authorized | Peru | Cerro Corona
    
Commitments and Contingencies Disclosure [Line Items]    
Commitments 6.4 44.7
Capital Expenditure -Authorized | Australia | St Ives
    
Commitments and Contingencies Disclosure [Line Items]    
Commitments 175.7 150.3
Capital Expenditure -Authorized | Australia | Agnew
    
Commitments and Contingencies Disclosure [Line Items]    
Commitments 1.6 10.4
Capital Expenditure -Authorized | Other Countries
    
Commitments and Contingencies Disclosure [Line Items]    
Commitments 0.8 0.4
Capital Expenditure -Contracted
    
Commitments and Contingencies Disclosure [Line Items]    
Commitments $ 244.6 $ 245.7