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Income Taxes (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Mineral Resources Rent Tax [Member]
 
Net deferred tax assets $ 314.7
Positive impact on the estimated annual effective tax rate 49.10%
Impact of Foreign Currency Elections [Member]
 
Net financial statement tax expense 60.5
FIN 48 [Member]
 
Financial statement impact of which was an income tax benefit $ 26.9