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Income and Mining Tax Expense (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]      
Current income and mining taxes $ (165.1) $ (353.9) $ (344.5)
Deferred income and mining taxes 59.4 (5.5) (40.0)
Income and mining tax expense (105.7) (359.4) (384.5)
South Africa
      
Income Taxes [Line Items]      
Current income and mining taxes (16.1) (14.5) (16.4)
Deferred income and mining taxes 14.2 24.2 5.5
Ghana
      
Income Taxes [Line Items]      
Current income and mining taxes (40.6) (170.6) (180.5)
Deferred income and mining taxes 68.3 (36.8) (12.0)
Australia
      
Income Taxes [Line Items]      
Current income and mining taxes (42.1) (64.1) (35.9)
Deferred income and mining taxes 1.0 (4.8) (51.3)
Peru
      
Income Taxes [Line Items]      
Current income and mining taxes (66.3) (104.7) (111.7)
Deferred income and mining taxes $ (24.1) $ 11.9 $ 17.8