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Pre-Tax (Loss)/Income from Continuing Operations Before Impairment of Investments in Equity Investees and Share of Equity Investees' Share of Losses and Discontinued Operations (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | $ (79.1) | $ 108.2 | $ (162.5)
South Africa |  |  |
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | (61.5) | (110.9) | (348.7)
Ghana |  |  |
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | 22.9 | 46.5 | (96.9)
Australia |  |  |
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | 178.0 | 117.9 | 111.0
Peru |  |  |
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | (61.4) | 109.0 | 153.4
British Virgin Islands |  |  |
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | $ (157.1) | $ (54.3) | $ 18.7

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