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Share-based payments - Outstanding Stock Options (Details) | 12 Months Ended
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Dec. 31, 2023 shares $ / shares | Dec. 31, 2022 shares $ / shares
Share-based Payment Arrangements [Abstract] |  |
Outstanding, beginning balance (in shares) | shares | 7,802,108 | 10,778,724
Exercised (in shares) | shares | (306,139) | (2,952,992)
Forfeited or expired (in shares) | shares | (11,408) | (23,624)
Outstanding, ending balance (in shares) | shares | 7,484,561 | 7,802,108
Exercisable (in shares) | shares | 7,484,561 | 4,539,188
Weighted average exercise price of share options outstanding, beginning balance (in cad per share) | $ 61 | $ 60
Weighted average exercise price of share options exercised (in cad per share) | 60 | 58
Weighted average exercise price of share options forfeited or expired (in cad per share) | 63 | 65
Weighted average exercise price of share options outstanding, ending balance (in cad per share) | 61 | 61
Weighted average exercise price of share options exercisable (in cad per share) | 61 | 58
Weighted average share price, share options exercised (in cad per share) | $ 63 | $ 69

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_d&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The number of share options exercisable in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The number of share options forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_b_iii&doctype=Standard -URIDate 2023-03-23 + Details
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