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Share-based compensation plans - Activity Related to PCSUs, Restricted Stock Units and Deferred Compensation Plans (Details) - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restricted Stock Units (RSUs)      
Number of Shares      
Beginning Balance (in shares) 535,704    
Granted (in shares) 325,771    
Vested (in shares) 0    
Converted (in shares) (179,198)    
Cancelled (in shares) (24,148)    
Dividend equivalents (in shares) 4,131    
Ending Balance (in shares) 662,260 535,704  
Average Grant Date Fair Value per Share      
Beginning Balance, weighted-average grant date fair value (usd per share) $ 53.23    
Granted, weighted-average grant date fair value (usd per share) 56.87    
Converted, weighted-average grant date fair value (usd per share) 54.12    
Cancelled, weighted-average grant date fair value (usd per share) 55.79    
Dividend equivalents, weighted-average grant date fair value (usd per share) 56.97    
Ending Balance, weighted-average grant date fair value (usd per share) $ 54.71 $ 53.23  
Restricted Stock Units (RSUs) | Nonvested      
Number of Shares      
Beginning Balance (in shares) 462,395    
Granted (in shares) 325,771    
Vested (in shares) 172,786    
Converted (in shares)    
Cancelled (in shares) (24,148)    
Dividend equivalents (in shares) 2,213    
Ending Balance (in shares) 593,445 462,395  
Restricted Stock Units (RSUs) | Vested      
Number of Shares      
Beginning Balance (in shares) 73,309    
Granted (in shares) 0    
Vested (in shares) 172,786    
Converted (in shares) (179,198)    
Cancelled (in shares) 0    
Dividend equivalents (in shares) 1,918    
Ending Balance (in shares) 68,815 73,309  
Performance Contingent Restricted Stock Units (PCSUs)      
Number of Shares      
Beginning Balance (in shares) 901,782    
Granted (in shares) 205,178    
Performance adjustments (in shares) (129,224)    
Vested (in shares) 0    
Converted (in shares) (291,818)    
Cancelled (in shares) (31,403)    
Dividend equivalents (in shares) 380    
Ending Balance (in shares) 654,895 901,782  
Average Grant Date Fair Value per Share      
Beginning Balance, weighted-average grant date fair value (usd per share) $ 52.81    
Granted, weighted-average grant date fair value (usd per share) 55.04 $ 51.94 $ 55.95
Performance adjustments, weighted-average grant date fair value (usd per share) 55.04    
Converted, weighted-average grant date fair value (usd per share) 51.68    
Cancelled, weighted-average grant date fair value (usd per share) 54.08    
Dividend equivalents, weighted-average grant date fair value (usd per share) 56.99    
Ending Balance, weighted-average grant date fair value (usd per share) $ 53.51 $ 52.81  
Performance Contingent Restricted Stock Units (PCSUs) | Nonvested      
Number of Shares      
Beginning Balance (in shares) 599,382    
Granted (in shares) 205,178    
Performance adjustments (in shares) (129,224)    
Vested (in shares) 225,530    
Converted (in shares) 0    
Cancelled (in shares) (31,403)    
Dividend equivalents (in shares) 0    
Ending Balance (in shares) 418,403 599,382  
Performance Contingent Restricted Stock Units (PCSUs) | Vested      
Number of Shares      
Beginning Balance (in shares) 302,400    
Granted (in shares) 0    
Performance adjustments (in shares) 0    
Vested (in shares) 225,530    
Converted (in shares) (291,818)    
Cancelled (in shares) 0    
Dividend equivalents (in shares) 380    
Ending Balance (in shares) 236,492 302,400  
Deferred Compensation Plans      
Number of Shares      
Beginning Balance (in shares) 287,015    
Deferred (in shares) 36,254    
Converted (in shares) (8,406)    
Dividend equivalents (in shares) 9,739    
Ending Balance (in shares) 324,602 287,015