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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, 2011 | Jun. 30, 2010 | Jun. 30, 2009
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | $ 194.8 |  | $ 1,507.8 |  | $ 851.4 |  | $ 551.2 |
SOUTH AFRICA |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | (221.0) |  | 378.5 |  | 192.0 |  | 269.9 |
GHANA |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | 216.8 |  | 624.9 |  | 343.1 |  | 140.7 |
AUSTRALIA |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | 77.3 |  | 258.8 |  | 55.7 |  | 92.3 |
PERU |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | 139.4 |  | 241.1 |  | 164.6 |  | 82.7 |
British Virgin Islands |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income before tax, impairment of investment in equity investee and share of equity investees' losses | $ (17.7) | [1] | $ 4.5 | [1] | $ 96.0 | [1] | $ (34.4) | [1]
[1] | The pre-tax loss relates to non-operating entitites, incorporated in the British Virgin Islands, includes impairment of investments for fiscal year ended December 31, 2011; net gain on disposal of investments in the six-month period ended December 31, 2010, a net gain on disposal of investments and impairment of investments in fiscal year ended June 30, 2010 and a net loss on disposal and impairment of listed investments in fiscal year ended June 30, 2009.

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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 SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph h -Subparagraph 1(i) Reference 2: 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 + Details
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