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Share-Based Compensation Plans - Narrative (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested share-based compensation $ 110.2    
Weighted average period of recognition of unvested share-based compensation (in years) 2 years    
Total Share-Based Compensation Expense $ 128.0 $ 86.8 $ 76.4
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 231,269 354,606 272,319
Restricted stock units weighted average grant date fair value | $ / shares $ 69.80 $ 62.67 $ 61.14
Performance based units vesting period 3 years    
Shares outstanding | shares 817,432 859,502 787,140
Aggregate intrinsic value of options granted $ 81.7 $ 76.5 $ 56.7
Vesting term of units granted 1 year 1 month 2 days 1 year 6 months 18 days 1 year 9 months 18 days
Total Share-Based Compensation Expense $ 31.7 $ 17.6 $ 14.9
Performance Stock Units, Granted 2015 or 2017 | Upper Limit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 125.00%    
Performance Stock Units, Granted 2015 or 2017 | Lower Limit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 0.00%    
Performance Stock Units Granted 2017 | Upper Limit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 150.00%    
Performance Stock Units Granted 2017 | 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 20,000,000    
Shares available for future grant under the Plan | shares 20,265,477    
Non Employee Directors, Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion ratio 1    
Total value of stock awards granted $ 1.2 $ 1.3 $ 1.2
Number of stock units granted | shares 13,354 18,001 16,449
Total Share-Based Compensation Expense $ 1.3 $ 1.3 $ 1.1
Restricted Stock Unit Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units granted | shares 863,308 1,301,693 970,317
Restricted stock units weighted average grant date fair value | $ / shares $ 88.19 $ 59.17 $ 70.79
Fair value of restricted stock units vested $ 88.7 $ 52.3 $ 58.1
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%