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Pre-Tax (Loss)/Income from Continuing Operations Before Impairment of Equity Investee and Share of Equity Investee's Share of Losses (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | $ (162.5) | $ 712.7 | $ 1,004.4
South Africa |  |  |
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | (348.7) | (169.5) | (124.9)
Ghana |  |  |
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | (96.9) | 441.6 | 624.9
Australia |  |  |
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | 111.0 | 156.5 | 258.8
Peru |  |  |
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | 153.4 | 259.6 | 241.1
British Virgin Islands |  |  |
Income Taxes [Line Items] |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | $ 18.7 | $ 24.5 | $ 4.5

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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