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Income Taxes Paid (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Income Taxes [Line Items]    
Income Taxes Paid $ 235.0 [1] $ 115.8 [1]
[1] Includes approximately $92 million in payments for tax audit settlements in the first quarter of 2012.