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Segment Results and Assets (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2010
Segment Reporting Information [Line Items] |  |  |  |
Corporate expenditure | $ 24.5 | $ 46.6 | $ 37.6 | $ 54.5
Environmental rehabilitation | 10.9 | 28.2 | 24.9 | 19.3
Employee termination costs | $ 35.3 | $ 13.8 | $ 32.8 | $ 10.3

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- Definition Ifrs Employee Termination Expense + References No definition available. + Details
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- Details
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