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Share-based payments - Outstanding Stock Options (Details) | 12 Months Ended
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Dec. 31, 2022 shares $ / shares | Dec. 31, 2021 shares $ / shares
Share-based Payment Arrangements [Abstract] |  |
Outstanding, beginning balance (in shares) | shares | 10,778,724 | 15,650,234
Exercised (in shares) | shares | (2,952,992) | (4,603,861)
Forfeited or expired (in shares) | shares | (23,624) | (267,649)
Outstanding, ending balance (in shares) | shares | 7,802,108 | 10,778,724
Exercisable (in shares) | shares | 4,539,188 | 4,316,424
Weighted average exercise price of share options outstanding, beginning balance (in cad per share) | $ / shares | $ 60 | $ 59
Weighted average exercise price of share options exercised (in cad per share) | $ / shares | 58 | 57
Weighted average exercise price of share options forfeited or expired (in cad per share) | $ / shares | 65 | 60
Weighted average exercise price of share options exercisable (in cad per share) | $ / shares | 58 | 58
Weighted average share price, share options exercised (in cad per share) | $ / shares | $ 69 | $ 64

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- Definition Share-based Payment Arrangements [Abstract] + References No definition available. + Details
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- Definition Weighted Average Share Price, Share Options Exercised1 + References No definition available. + Details
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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 2022-03-24 -Paragraph 45 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45_d&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -Subparagraph b -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 45 -Subparagraph b -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 45 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45_b_iii&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The weighted average exercise price of share options exercisable in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -Subparagraph b -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2022-03-24 + Details
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