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Commitment (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2010
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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

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