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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended 48 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to unvested share-based equity awards $ 57.0      
Weighted average period of recognition of unvested share-based equity awards (in years) 1 year 7 days      
Unrecognized compensation cost related to unvested share-based equity awards, Stock Options $ 5.8      
Unrecognized compensation cost related to unvested share-based equity awards, Restricted Stock $ 51.2      
Weighted average remaining contractual life of option outstanding 5 years 8 months 26 days      
Weighted average remaining contractual life of option exercisable 4 years 10 months 13 days      
Estimated weighted average fair value of options granted $ 36.77 $ 21.76 $ 19.54  
Total intrinsic value of options exercised $ 67.0      
Total intrinsic value of options outstanding 44.2      
Total intrinsic value of options exercisable $ 31.8      
Weighted average fair values at the grant dates of grants awarded $ 165.54 $ 98.09 $ 96.38  
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%      
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 200.00%      
Omnibus Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares of common stock available for issuance 27,775,000      
Omnibus Incentive Plan | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option awards granted, vesting period 1 year      
Omnibus Incentive Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option awards granted, vesting period 4 years      
Omnibus Incentive Plan | Deferred Stock Units | Non-employee directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares granted 10,000 20,000 15,000  
Additional shares issued to retired directors 8,000 13,000 14,000 56,000
Omnibus Incentive Plan | Deferred Stock Units | Non-employee directors | Since 2007        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares granted 226,000      
Stock Option Plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares granted 289,720      
Directors Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum shares authorized for issuance 500,000      
Shares of common stock earned 73,000      
Additional shares issued to retired directors 427,000      
Liabilities under share plan $ 8.8 $ 8.0   $ 8.0
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted 62,488      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted 397,987      
Total intrinsic value of restricted stock expected to vest $ 120.4      
Weighted average fair values at the grant dates of grants awarded $ 122.08 $ 92.23 $ 89.75