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Carrying Value of Equity Investment in Rusoro (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
Schedule of Equity Method Investments [Line Items]        
Opening balance $ 29.6 [1] $ 30.2 [1]    
Share of results, net of tax 4.9 4.0 (22.7) (3.5)
Impairment   (6.8)   (87.4)
Other comprehensive income     0.8 (0.3)
Closing balance 30.2 [1] 28.2 [1] 29.6 [1]  
Rusoro Mining Limited
        
Schedule of Equity Method Investments [Line Items]        
Opening balance 18.2 20.0 48.4  
Share of results, net of tax 1.8   (31.1)  
Impairment   (6.8)    
Other comprehensive income     0.8  
Closing balance $ 20.0 $ 13.2 $ 18.2  
[1] Equity investees comprise the following: Ownership % Market value Investment Description of business December 31, 2011 December 31, 2010 June 30, 2010 December 31, 2011 December 31, 2010 June 30, 2010 Rusoro Mining Limited Gold mining 26.4 26.4 26.4 13.2 51.3 31.1 Rand Refinery Limited Refining of gold bullion and by-products 34.9 34.9 34.9 * * * Timpetra Resources Limited Resource exploration 21.8 N/A N/A 1.2 N/A N/A * -Not readily determinable