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Share-based compensation - Changes in SARs and TSARs (Details) | 12 Months Ended
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Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 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 | 840,772 | 857,407
Number of outstanding units granted (in units) | shares | 39,490 | 96,160
Number of outstanding units exercised (in units) | shares | (30,151) | (20,635)
Number of outstanding units cancelled (in units) | shares | (25,100) | (31,660)
Number of outstanding units expired (in shares) | shares | (158,755) | (60,500)
Number of outstanding units, end of period (in units) | shares | 666,256 | 840,772
Exercise price of outstanding units, beginning of period (in usd per unit) | $ / shares | $ 50.61 | $ 52.02
Exercise price of outstanding units granted (in usd per unit) | $ / shares | 38.79 | 29.27
Exercise price of outstanding units exercised (in usd per unit) | $ / shares | 34.06 | 34.59
Exercise price of outstanding units cancelled (in usd per unit) | $ / shares | 52.34 | 58.13
Exercise price of outstanding units expired (in usd per unit) | $ / shares | 71.10 | 38.24
Exercise price of outstanding units, end of period (in usd per unit) | $ / shares | $ 45.70 | $ 50.61
TSARs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in units) | shares | 2,340,490 | 1,661,327
Number of outstanding units granted (in units) | shares | 338,260 | 761,050
Number of outstanding units exercised (in units) | shares | (50,623) | (1,900)
Number of outstanding units cancelled (in units) | shares | (21,460) | (5,967)
Number of outstanding units expired (in shares) | shares | (226,430) | (74,020)
Number of outstanding units, end of period (in units) | shares | 2,380,237 | 2,340,490
Exercise price of outstanding units, beginning of period (in usd per unit) | $ / shares | $ 45.43 | $ 52.55
Exercise price of outstanding units granted (in usd per unit) | $ / shares | 38.79 | 29.27
Exercise price of outstanding units exercised (in usd per unit) | $ / shares | 33.89 | 34.59
Exercise price of outstanding units cancelled (in usd per unit) | $ / shares | 50.98 | 58.38
Exercise price of outstanding units expired (in usd per unit) | $ / shares | 73.13 | 38.24
Exercise price of outstanding units, end of period (in usd per unit) | $ / shares | $ 42.05 | $ 45.43

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
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