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Pre-Tax Income Before Impairment of Equity Investee and Share of Equity Investee's Share of Losses (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
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Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2010
Income Taxes [Line Items] |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | $ 194.8 | $ 996.1 | $ 1,507.8 | $ 851.4
South Africa |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | (221.0) | 113.9 | 378.5 | 192.0
Ghana |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | 216.8 | 441.6 | 624.9 | 343.1
Australia |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | 77.3 | 156.5 | 258.8 | 55.7
Peru |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | 139.4 | 259.6 | 241.1 | 164.6
British Virgin Islands |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | $ (17.7) | $ 24.5 | $ 4.5 | $ 96.0

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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=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 + Details
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