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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, 2011
Jun. 30, 2010
Jun. 30, 2009
Segment Reporting Information [Line Items]        
Corporate expenditure $ 20.7 $ 25.9 $ 47.5 $ 35.5
Environmental rehabilitation 10.9 24.9 19.3 13.9
Employee termination costs $ 35.3 $ 32.8 $ 10.2 $ 21.0