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Share-based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of authorized common stock shares under LTIP (in shares) 63,500,000    
Number of shares under LTIP, available for issuance of restricted common shares, performance share units and stock options 23,600,000    
Unearned compensation expense, before income taxes $ 79.0    
Weighed average period of recognition for unearned compensation expense 1 year 9 months 18 days    
Outstanding stock options (in shares) 2,087,000 4,382,000  
Number of stock options, exercisable (in shares) 1,170,000    
Weighted average exercise price per share - Outstanding at end of period (in dollars per share) $ 61.15 $ 61.57  
Weighted average exercise price per share - stock options exercisable (in dollars per share) $ 62.27    
Weighted average remaining contractual term - Outstanding 6 years 6 months 5 years 1 month 6 days  
Weighted average remaining contractual life for options, exercisable 5 years    
Aggregated intrinsic value $ 28.0    
Aggregated intrinsic value for exercisable options 15.0    
Aggregated intrinsic value for options exercised $ 45.0 $ 3.0 $ 10.0
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Valuation method used for performance share units Monte Carlo simulation    
Performance period 3 years    
Performance Share Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout percentage 0.00%    
Performance Share Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout percentage 200.00%    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Contractual term of stock options 10 years