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Share-Based Compensation Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested share-based compensation $ 123.6    
Weighted average period of recognition of unvested share-based compensation (in years) 2 years    
Total Share-Based Compensation Expense $ 76.4 $ 77.7 $ 73.8
Stock options under the Plan, the 2002 Plan, and the 1992 Plan | Upper Limit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option maximum term (in years) 10 years    
Options vest and become exercisable after the date of grant (in years) 4 years    
Stock options under the Plan, the 2002 Plan, and the 1992 Plan | Lower Limit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of the fair value for options to purchase common stock on the date the options are granted 100.00%    
Options vest and become exercisable after the date of grant (in years) 1 year    
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units granted 272,319 249,618  
Restricted stock units weighted average grant date fair value $ 61.14 $ 53.08  
performance based units vesting period 3 years    
Aggregate intrinsic value of options granted $ 56.7 $ 48.8  
Vesting term of units granted 1 year 9 months 18 days 2 years 2 months 12 days  
Total Share-Based Compensation Expense $ 14.9 $ 12.0 7.4
Performance Stock Units | Upper Limit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 125.00%    
Performance Stock Units | Lower Limit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 0.00%    
2012 Stock Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of common stock authorized for issuance under the Plan 30,000,000    
Shares available for future grant under the Plan 28,597,071    
Non Employee Directors, Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total value of stock awards granted $ 1.2 $ 1.0 $ 1.1
Number of stock units granted 16,449 16,770 20,599
Total Share-Based Compensation Expense $ 1.1 $ 1.0 $ 1.1
Restricted Stock Unit Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units vesting description
The restricted stock units granted in 2015 predominately vest at a rate equal to 50% on the third anniversary date of the grant and 50% on the fourth anniversary date.
   
Number of restricted stock units granted 970,317 1,086,241 1,181,321
Restricted stock units weighted average grant date fair value $ 70.79 $ 61.17 $ 52.82
Fair value of restricted stock units vested $ 58.1 $ 63.9 $ 47.0
Restricted Stock Unit Awards | Third Anniversary Of Grant Date      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 50.00%    
Restricted Stock Unit Awards | Fourth Anniversary Of Grant Date      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 50.00%