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Shareholders' equity - Narrative (Detail) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Apr. 30, 2020
May 04, 2010
Stockholders Equity Note [Line Items]            
Common stock, authorized (in shares) 800,000,000 800,000,000 800,000,000      
Preferred stock, authorized (in shares) 2,000,000 2,000,000 2,000,000      
Common stock, outstanding (in shares) 219,500,000 221,400,000 219,500,000      
Treasury stock (in shares) 104,918,360 103,012,455 104,918,360      
Preferred stock, issued (in shares) 0 0 0      
Preferred stock, outstanding (in shares) 0 0 0      
Shares approved to be repurchased under share repurchase program, amount (up to)   $ 300,000,000        
Share repurchase program period (in years) 3 years          
Shares repurchased under share repurchase program (in shares)   0 0 0    
Stock options | Employee            
Stockholders Equity Note [Line Items]            
Shares reserved for issuance (in shares)         20,000,000 60,000,000
Restricted Stock Units (RSUs) | Employee            
Stockholders Equity Note [Line Items]            
Number of shares of common stock received for each RSU granted   1        
Award vesting percentage   25.00%        
Performance share units            
Stockholders Equity Note [Line Items]            
Unrecognized compensation cost related to non-vested share-based compensation   $ 8,100,000   $ 0    
Unrecognized compensation cost related to non-vested share-based compensation for options, recognition period   1 year 8 months 12 days        
Performance share units | Minimum            
Stockholders Equity Note [Line Items]            
Number of shares ultimately issued for each award (as a percent)   0.00%        
Performance share units | Maximum            
Stockholders Equity Note [Line Items]            
Number of shares ultimately issued for each award (as a percent)   200.00%        
Performance share units | Employee            
Stockholders Equity Note [Line Items]            
Number of shares of common stock received for each RSU granted   1        
Restricted Stock and Restricted Stock Units            
Stockholders Equity Note [Line Items]            
Unrecognized compensation cost related to non-vested share-based compensation   $ 26,300,000        
Unrecognized compensation cost related to non-vested share-based compensation for options, recognition period   2 years 6 months