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Share-based compensation plans - Activity Related to PCSUs, Restricted Stock Units and Deferred Compensation Plans (Details)
12 Months Ended
Dec. 31, 2022
$ / shares
shares
Restricted Stock Awards  
Number of Shares  
Beginning Balance (in shares) 414,861
Granted (in shares) 291,365
Vested (in shares) 0
Converted (in shares) (122,337)
Cancelled (in shares) (51,908)
Dividend equivalents (in shares) 3,723
Ending Balance (in shares) 535,704
Average Grant Date Fair Value per Share  
Beginning Balance, weighted-average grant date fair value (usd per share) | $ / shares $ 53.32
Granted, weighted-average grant date fair value (usd per share) | $ / shares 53.55
Converted, weighted-average grant date fair value (usd per share) | $ / shares 53.62
Cancelled, weighted-average grant date fair value (usd per share) | $ / shares 55.04
Dividend equivalents, weighted-average grant date fair value (usd per share) | $ / shares 56.33
Ending Balance, weighted-average grant date fair value (usd per share) | $ / shares $ 53.23
Restricted Stock Awards | Nonvested  
Number of Shares  
Beginning Balance (in shares) 332,597
Granted (in shares) 291,365
Vested (in shares) 111,333
Converted (in shares)
Cancelled (in shares) (51,908)
Dividend equivalents (in shares) 1,674
Ending Balance (in shares) 462,395
Restricted Stock Awards | Vested  
Number of Shares  
Beginning Balance (in shares) 82,264
Granted (in shares) 0
Vested (in shares) 111,333
Converted (in shares) (122,337)
Cancelled (in shares) 0
Dividend equivalents (in shares) 2,049
Ending Balance (in shares) 73,309
Performance Contingent Restricted Stock Units  
Number of Shares  
Beginning Balance (in shares) 578,306
Granted (in shares) 201,835
Performance adjustments (in shares) 304,554
Converted (in shares) (77,167)
Cancelled (in shares) (106,779)
Dividend equivalents (in shares) 1,033
Ending Balance (in shares) 901,782
Average Grant Date Fair Value per Share  
Beginning Balance, weighted-average grant date fair value (usd per share) | $ / shares $ 53.67
Granted, weighted-average grant date fair value (usd per share) | $ / shares 51.94
Performance adjustments, weighted-average grant date fair value (usd per share) | $ / shares 51.96
Converted, weighted-average grant date fair value (usd per share) | $ / shares 52.62
Cancelled, weighted-average grant date fair value (usd per share) | $ / shares 53.59
Dividend equivalents, weighted-average grant date fair value (usd per share) | $ / shares 59.32
Ending Balance, weighted-average grant date fair value (usd per share) | $ / shares $ 52.81
Performance Contingent Restricted Stock Units | Nonvested  
Number of Shares  
Beginning Balance (in shares) 480,653
Granted (in shares) 201,835
Performance adjustments (in shares) 304,554
Vested (in shares) 280,881
Converted (in shares) 0
Cancelled (in shares) (106,779)
Dividend equivalents (in shares) 0
Ending Balance (in shares) 599,382
Performance Contingent Restricted Stock Units | Vested  
Number of Shares  
Beginning Balance (in shares) 97,653
Granted (in shares) 0
Performance adjustments (in shares) 0
Vested (in shares) 280,881
Converted (in shares) (77,167)
Cancelled (in shares) 0
Dividend equivalents (in shares) 1,033
Ending Balance (in shares) 302,400
Deferred Compensation Plans  
Number of Shares  
Beginning Balance (in shares) 380,757
Deferred (in shares) 37,617
Converted (in shares) (144,244)
Dividend equivalents (in shares) 12,885
Ending Balance (in shares) 287,015