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Commitment (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2010
Commitments and Contingencies Disclosure [Line Items]      
Ifrs Commitments, Fair Value Disclosure $ 1,243.1 $ 1,291.6 $ 1,252.8
Other guarantees 1.7 2.2 2.6
Ifrs Capital Expenditure - Authorized | SOUTH AFRICA | Driefontein Kloof Complex
      
Commitments and Contingencies Disclosure [Line Items]      
Ifrs Commitments, Fair Value Disclosure 373.7 375.2 342.4
Ifrs Capital Expenditure - Authorized | SOUTH AFRICA | Beatrix
      
Commitments and Contingencies Disclosure [Line Items]      
Ifrs Commitments, Fair Value Disclosure 87.1 96.8 87.2
Ifrs Capital Expenditure - Authorized | SOUTH AFRICA | South Deep Gold Mine
      
Commitments and Contingencies Disclosure [Line Items]      
Ifrs Commitments, Fair Value Disclosure 433.1 573.4 568.9
Ifrs Capital Expenditure - Authorized | GHANA | Tarkwa Mine
      
Commitments and Contingencies Disclosure [Line Items]      
Ifrs Commitments, Fair Value Disclosure 126.5 67.7 148.9
Ifrs Capital Expenditure - Authorized | GHANA | Damang
      
Commitments and Contingencies Disclosure [Line Items]      
Ifrs Commitments, Fair Value Disclosure 16.9 53.1 7.5
Ifrs Capital Expenditure - Authorized | PERU | Cerro Corona
      
Commitments and Contingencies Disclosure [Line Items]      
Ifrs Commitments, Fair Value Disclosure 44.7 44.0 29.4
Ifrs Capital Expenditure - Authorized | AUSTRALIA | St Ives
      
Commitments and Contingencies Disclosure [Line Items]      
Ifrs Commitments, Fair Value Disclosure 150.3 22.3 58.1
Ifrs Capital Expenditure - Authorized | AUSTRALIA | Agnew
      
Commitments and Contingencies Disclosure [Line Items]      
Ifrs Commitments, Fair Value Disclosure 10.4 59.0 10.2
Ifrs Capital Expenditure - Authorized | Other Countries
      
Commitments and Contingencies Disclosure [Line Items]      
Ifrs Commitments, Fair Value Disclosure 0.4 0.1 0.2
Ifrs Capital Expenditure - Contracted
      
Commitments and Contingencies Disclosure [Line Items]      
Ifrs Commitments, Fair Value Disclosure $ 245.7 $ 167.4 $ 236.9