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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Shares, Outstanding at January 1, 2013 3,039,288    
Number of Shares, Exercised (1,073,118)    
Number of Shares, Outstanding at December 31, 2013 1,966,170 3,039,288  
Number of Shares, Exercisable at December 31, 2013 1,941,330    
Weighted Average Exercise Price, Outstanding at January 1, 2013 $ 23.51    
Weighted Average Exercise Price, Exercised $ 17.58    
Weighted Average Exercise Price, Outstanding at December 31, 2013 $ 26.74 $ 23.51  
Weighted Average Exercise Price, Exercisable at December 31, 2013 $ 26.62    
Weighted Average Remaining Contractual Term (in years), Outstanding at December 31, 2013 4 years    
Weighted Average Remaining Contractual Term (in years), Exercisable at December 31, 2013 4 years    
Aggregate Intrinsic Value, Exercised $ 35.4 $ 18.1 $ 14.1
Aggregate Intrinsic Value, Outstanding at December 31, 2013 52.4    
Aggregate Intrinsic Value, Exercisable at December 31, 2013 $ 51.9