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Share-based compensation plans - Option Activity (Details)
9 Months Ended
Sep. 30, 2024
$ / shares
shares
Performance-Based Options  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Beginning balance, shares | shares 174,400
Exercised, shares | shares (174,400)
Ending balance, shares | shares 0
Weighted Average Grant Date Fair Value Per Share  
Beginning balance (dollars per share) | $ / shares $ 17.92
Exercised (dollars per share) | $ / shares 17.92
Ending balance (dollars per share) | $ / shares $ 0
Time Based Vesting Option  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Beginning balance, shares | shares 115,700
Exercised, shares | shares (93,200)
Ending balance, shares | shares 22,500
Weighted Average Grant Date Fair Value Per Share  
Beginning balance (dollars per share) | $ / shares $ 21.43
Exercised (dollars per share) | $ / shares 21.54
Ending balance (dollars per share) | $ / shares $ 20.98