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Major Items Causing Income Tax Provision to Differ from South African Mining Statutory Rate (Parenthetical) (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] |  |  |  |  |  |  |  |
Non taxable income/non deductible expenditure | $ 197.6 | [1] | $ 116.1 | [1] | $ 199.0 | [1] | $ (27.4) | [1]
Non taxable income/non deductible expenditure, share-based-compensation | 11.6 |  | 23.8 |  | 24.5 |  |  |
Non taxable income/non deductible expenditure, exploration, feasibility and evaluation costs | 25.9 |  | 74.4 |  | 92.8 |  |  |
Impact of royalty expense on product sales, predetermined percentage | 5.00% |  |  |  |  |  |  |
Broad-based BEE consortium (BEECO) |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Non taxable income/non deductible expenditure, share-based-compensation | $ 128.0 |  |  |  |  |  |  |
[1] | The $116.1 million (fiscal year ended December 31, 2011: $199.0 million, six months ended December 31, 2010: $197.6 million) non-deductible expenditure comprises mainly $23.8 million (fiscal year ended December 31, 2011: $24.5 million, six months ended December 31, 2010: $11.6 million) share-based-compensation, $nil million (fiscal year ended December 31, 2011: $nil million, six months ended December 31, 2010: $128.0 million) empowerment transaction costs and $74.4 million (fiscal year ended December 31, 2011: $92.8 million, six months ended December 31, 2010: $25.9 million) exploration, feasibility and evaluation costs. There are no other individually significant amounts included in this line item.

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- Definition Total non-deductible costs incurred for purposes of upgrading resources from one category to another or for purposes of upgrading resources to proven and probable reserves, even when in close proximity to the company's development and production stage properties, as well as non-deductible feasibility and evaluation cost + References No definition available. + Details
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- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to income that is exempt from income taxes or nondeductable expenses under enacted tax laws. + References No definition available. + Details
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- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to differences in the deductibility of incentive stock options and other equity-based compensation costs in accordance with generally accepted accounting principles and enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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