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Undiscounted Closure Cost Estimates (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Asset Retirement Obligations [Line Items] |  |  |
Total closure cost estimate | [1] | $ 353.2 | $ 390.8
South Africa |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Total closure cost estimate |  | 29.0 | 32.3
Ghana |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Total closure cost estimate |  | 91.5 | 89.4
Australia |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Total closure cost estimate |  | 186.0 | 212.7
Peru |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Total closure cost estimate |  | $ 46.7 | $ 56.4
[1] | Includes discounting of $77.5 million in the year ended December 31, 2015 (December 31, 2014: $90.7 million) in order to reconcile the gross closure cost estimate of $353.2 million (December 31, 2014: $390.8 million) to the provision for environmental rehabilitation of $275.7 million (December 31, 2014: $300.1 million)

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- Definition Provision for asset retirement obligations, undiscounted closure costs. + References No definition available. + Details
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