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Share-Based Compensation Plans - Additional Information (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested share-based compensation $ 138.6    
Weighted average period of recognition of unvested share-based compensation (in years) 2 years    
Total Share-Based Compensation Expense $ 86.8 $ 76.4 $ 77.7
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]      
Conversion ratio 1    
Number of restricted stock units granted | shares 354,606 272,319 249,618
Restricted stock units weighted average grant date fair value | $ / shares $ 62.67 $ 61.14 $ 53.08
Performance based units vesting period 3 years    
Shares outstanding | shares 859,502 787,140 724,450
Aggregate intrinsic value of options granted $ 76.5 $ 56.7 $ 48.8
Vesting term of units granted 1 year 6 months 18 days 1 year 9 months 18 days 2 years 2 months 12 days
Total Share-Based Compensation Expense $ 17.6 $ 14.9 $ 12.0
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 | shares 30,000,000    
Shares available for future grant under the Plan | shares 20,022,297    
Non Employee Directors, Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion ratio 1    
Total value of stock awards granted $ 1.3 $ 1.2 $ 1.0
Number of stock units granted | shares 18,001 16,449 16,770
Total Share-Based Compensation Expense $ 1.3 $ 1.1 $ 1.0
Restricted Stock Unit Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units granted | shares 1,301,693 970,317 1,086,241
Restricted stock units weighted average grant date fair value | $ / shares $ 59.17 $ 70.79 $ 61.17
Fair value of restricted stock units vested $ 52.3 $ 58.1 $ 63.9
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]      
Conversion ratio 1    
Percentage at which units can vest 50.00%