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Share-based compensation - Changes in SARs and TSARs (Details) | 12 Months Ended
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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

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