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Income and Mining Tax Expense (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
Income Taxes [Line Items]        
Current income and mining taxes $ (159.5) $ (436.4) $ (234.0) $ (172.9)
Deferred income and mining taxes 25.7 (115.6) (124.4) (91.7)
Income and mining tax expense (133.8) (552.0) (358.4) (264.6)
SOUTH AFRICA
       
Income Taxes [Line Items]        
Current income and mining taxes (39.0) (108.3) (67.7) (101.6)
Deferred income and mining taxes 44.9 (70.1) (58.6) (37.5)
GHANA
       
Income Taxes [Line Items]        
Current income and mining taxes (73.4) (180.5) (98.6) (34.2)
Deferred income and mining taxes 4.5 (12.0) (28.1) (24.7)
AUSTRALIA
       
Income Taxes [Line Items]        
Current income and mining taxes   (35.9) (16.5) (21.0)
Deferred income and mining taxes (22.9) (51.3) (12.3) (12.8)
PERU
       
Income Taxes [Line Items]        
Current income and mining taxes (47.1) (111.7) (51.2) (16.1)
Deferred income and mining taxes $ (0.8) $ 17.8 $ (25.4) $ (16.7)