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Share-based compensation - Changes in SARs and TSARs (Details)
 12 Months Ended
Dec. 31, 2024
shares
$ / shares
Dec. 31, 2023
shares
$ / shares
SARs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of outstanding units, beginning of period (in units) | shares 402,532 407,687
Number of outstanding units granted (in units) | shares 83,840 51,160
Number of outstanding units exercised (in units) | shares (30,557) (50,715)
Number of outstanding units cancelled (in units) | shares (2,421) (5,600)
Number of outstanding units expired (in units) | shares (87,120)  
Number of outstanding units, end of period (in units) | shares 366,274 402,532
Exercise price of outstanding units, beginning of period (in usd per unit) | $ / shares $ 46.65 $ 44.67
Exercise price of outstanding units granted (in usd per unit) | $ / shares 43.13 50.49
Exercise price of outstanding units exercised (in usd per unit) | $ / shares 37.10 33.85
Exercise price of outstanding units cancelled (in usd per unit) | $ / shares 51.94 53.69
Exercise price of outstanding units expired (in usd per unit) | $ / shares 50.15  
Exercise price of outstanding units, end of period (in usd per unit) | $ / shares $ 45.77 $ 46.65
TSARs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of outstanding units, beginning of period (in units) | shares 2,007,470 2,188,359
Number of outstanding units granted (in units) | shares 255,540 169,190
Number of outstanding units exercised (in units) | shares (185,957) (336,535)
Number of outstanding units cancelled (in units) | shares (20,893) (13,544)
Number of outstanding units expired (in units) | shares (236,062)  
Number of outstanding units, end of period (in units) | shares 1,820,098 2,007,470
Exercise price of outstanding units, beginning of period (in usd per unit) | $ / shares $ 45.10 $ 42.68
Exercise price of outstanding units granted (in usd per unit) | $ / shares 42.58 50.49
Exercise price of outstanding units exercised (in usd per unit) | $ / shares 33.49 31.88
Exercise price of outstanding units cancelled (in usd per unit) | $ / shares 50.74 51.36
Exercise price of outstanding units expired (in usd per unit) | $ / shares 50.17  
Exercise price of outstanding units, end of period (in usd per unit) | $ / shares $ 45.21 $ 45.10