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Share-based compensation - Changes in SARs and TSARs (Details) | 12 Months Ended
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Dec. 31, 2022 shares $ / shares | Dec. 31, 2021 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 | 666,256 | 840,772
Number of outstanding units granted (in units) | shares | 32,730 | 39,490
Number of outstanding units exercised (in units) | shares | (129,162) | (30,151)
Number of outstanding units cancelled (in units) | shares | (12,900) | (25,100)
Number of outstanding units expired (in units) | shares | (149,237) | (158,755)
Number of outstanding units, end of period (in units) | shares | 407,687 | 666,256
Exercise price of outstanding units, beginning of period (in usd per unit) | $ / shares | $ 45.7 | $ 50.61
Exercise price of outstanding units granted (in usd per unit) | $ / shares | 48.49 | 38.79
Exercise price of outstanding units exercised (in usd per unit) | $ / shares | 37.17 | 34.06
Exercise price of outstanding units cancelled (in usd per unit) | $ / shares | 55.70 | 52.34
Exercise price of outstanding units expired (in usd per unit) | $ / shares | 55.66 | 71.10
Exercise price of outstanding units, end of period (in usd per unit) | $ / shares | $ 44.67 | $ 45.7
TSARs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in units) | shares | 2,380,237 | 2,340,490
Number of outstanding units granted (in units) | shares | 266,090 | 338,260
Number of outstanding units exercised (in units) | shares | (290,577) | (50,623)
Number of outstanding units cancelled (in units) | shares | (21,922) | (21,460)
Number of outstanding units expired (in units) | shares | (145,469) | (226,430)
Number of outstanding units, end of period (in units) | shares | 2,188,359 | 2,380,237
Exercise price of outstanding units, beginning of period (in usd per unit) | $ / shares | $ 42.05 | $ 45.43
Exercise price of outstanding units granted (in usd per unit) | $ / shares | 48.49 | 38.79
Exercise price of outstanding units exercised (in usd per unit) | $ / shares | 35.94 | 33.89
Exercise price of outstanding units cancelled (in usd per unit) | $ / shares | 46.45 | 50.98
Exercise price of outstanding units expired (in usd per unit) | $ / shares | 55.82 | 73.13
Exercise price of outstanding units, end of period (in usd per unit) | $ / shares | $ 42.68 | $ 42.05

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