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Segment Results and Assets (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Corporate expenditure | $ 39.4 | $ 38.2 | $ 30.8
Environmental rehabilitation | 10.4 | 13.9 | 11.1
Employee termination costs | 35.5 | 6.1 | 0.8
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairments of investments and assets recognized | 140.7 |  |
Tarkwa Mine |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairments of investments and assets recognized | 204.6 |  |
Damang |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairments of investments and assets recognized | 188.9 |  |
St Ives |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairments of investments and assets recognized | 264.9 |  |
Cerro Corona |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairments of investments and assets recognized | $ 10.4 |  |

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- Details
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