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Stock Incentive Plans and Stock Purchase Plan - Schedule of Activity and Certain Other Information Related to Stock Option Awards (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share Based Payment Award Stock Options Valuation Assumptions [Line Items]      
Number of Shares, Outstanding at January 1, 2012 2,053,573    
Number of Shares, Granted       
Number of Shares, Canceled (5,794)    
Number of Shares, Exercised (528,135)    
Number of Shares, Outstanding at December 31, 2012 1,519,644 2,053,573  
Number of Shares, Exercisable at December 31, 2012 1,474,539    
Weighted Average Exercise Price, Outstanding at January 1, 2012 $ 45.10    
Weighted Average Exercise Price, Granted       
Weighted Average Exercise Price, Canceled $ 68.56    
Weighted Average Exercise Price, Exercised $ 39.33    
Weighted Average Exercise Price, Outstanding at December 31, 2012 $ 47.02 $ 45.10  
Weighted Average Exercise Price, Exercisable at December 31, 2012 $ 46.46    
Weighted Average Remaining Contractual Term (in years), Outstanding at December 31, 2012 4 years 1 month 6 days    
Weighted Average Remaining Contractual Term (in years), Exercisable at December 31, 2012 3 years 10 months 24 days    
Aggregate Intrinsic Value, Exercised $ 18.1 $ 14.1 $ 9.1
Aggregate Intrinsic Value, Outstanding at December 31, 2012 49.4    
Aggregate Intrinsic Value, Exercisable at December 31, 2012 $ 48.8