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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, 2021
$ / shares
shares
Restricted Stock Awards  
Number of Shares  
Beginning Balance (in shares) 285,446
Granted (in shares) 201,570
Vested (in shares) 0
Converted (in shares) (64,093)
Cancelled (in shares) (12,053)
Dividend equivalents (in shares) 3,991
Ending Balance (in shares) 414,861
Average Grant Date Fair Value per Share  
Beginning Balance, weighted-average grant date fair value (usd per share) | $ / shares $ 50.19
Granted, weighted-average grant date fair value (usd per share) | $ / shares 57.77
Converted, weighted-average grant date fair value (usd per share) | $ / shares 53.28
Cancelled, weighted-average grant date fair value (usd per share) | $ / shares 55.98
Dividend equivalents, weighted-average grant date fair value (usd per share) | $ / shares 62.95
Ending Balance, weighted-average grant date fair value (usd per share) | $ / shares $ 53.32
Restricted Stock Awards | Nonvested  
Number of Shares  
Beginning Balance (in shares) 209,583
Granted (in shares) 201,570
Vested (in shares) 68,231
Converted (in shares) 0
Cancelled (in shares) (12,053)
Dividend equivalents (in shares) 1,728
Ending Balance (in shares) 332,597
Restricted Stock Awards | Vested  
Number of Shares  
Beginning Balance (in shares) 75,863
Granted (in shares) 0
Vested (in shares) 68,231
Converted (in shares) (64,093)
Cancelled (in shares) 0
Dividend equivalents (in shares) 2,263
Ending Balance (in shares) 82,264
Performance Contingent Restricted Stock Units  
Number of Shares  
Beginning Balance (in shares) 323,554
Granted (in shares) 145,696
Performance adjustments (in shares) 256,711
Converted (in shares) (133,960)
Cancelled (in shares) (14,633)
Dividend equivalents (in shares) 938
Ending Balance (in shares) 578,306
Average Grant Date Fair Value per Share  
Beginning Balance, weighted-average grant date fair value (usd per share) | $ / shares $ 49.15
Granted, weighted-average grant date fair value (usd per share) | $ / shares 55.95
Performance adjustments, weighted-average grant date fair value (usd per share) | $ / shares 54.28
Converted, weighted-average grant date fair value (usd per share) | $ / shares 46.34
Cancelled, weighted-average grant date fair value (usd per share) | $ / shares 54.79
Dividend equivalents, weighted-average grant date fair value (usd per share) | $ / shares 62.95
Ending Balance, weighted-average grant date fair value (usd per share) | $ / shares $ 53.67
Performance Contingent Restricted Stock Units | Nonvested  
Number of Shares  
Beginning Balance (in shares) 157,122
Granted (in shares) 145,696
Performance adjustments (in shares) 256,711
Vested (in shares) 64,243
Converted (in shares) 0
Cancelled (in shares) (14,633)
Dividend equivalents (in shares) 0
Ending Balance (in shares) 480,653
Performance Contingent Restricted Stock Units | Vested  
Number of Shares  
Beginning Balance (in shares) 166,432
Granted (in shares) 0
Performance adjustments (in shares) 0
Vested (in shares) 64,243
Converted (in shares) (133,960)
Cancelled (in shares) 0
Dividend equivalents (in shares) 938
Ending Balance (in shares) 97,653
Deferred Compensation Plans  
Number of Shares  
Beginning Balance (in shares) 372,413
Deferred (in shares) 38,127
Converted (in shares) (40,527)
Dividend equivalents (in shares) 10,744
Ending Balance (in shares) 380,757