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Share-based payments - Outstanding Stock Options (Details) | 12 Months Ended
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Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares
Share-based Payment Arrangements [Abstract] |  |
Outstanding, beginning balance (in shares) | shares | 15,650,234 | 12,825,541
Granted (in shares) | shares | 0 | 3,420,407
Exercised (in shares) | shares | (4,603,861) | (506,828)
Forfeited or expired (in shares) | shares | (267,649) | (88,886)
Outstanding, ending balance (in shares) | shares | 10,778,724 | 15,650,234
Exercisable (in shares) | shares | 4,316,424 | 5,186,600
Weighted average exercise price of share options outstanding, beginning balance (CAD per share) | $ / shares | $ 59 | $ 57
Weighted average exercise price of share options granted (CAD per share) | $ / shares | 0 | 65
Weighted average exercise price of share options exercised (CAD per share) | $ / shares | 57 | 52
Weighted average exercise price of share options forfeited or expired (CAD per share) | $ / shares | 60 | 61
Weighted average exercise price of share options exercisable (CAD per share) | $ / shares | 58 | 58
Weighted average share price, share options exercised (CAD per share) | $ / shares | $ 64 | $ 63

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- Definition Share-based Payment Arrangements [Abstract] + 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 2021-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_d&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The number of share options exercised 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 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_iii&doctype=Standard -URIDate 2021-03-24 + Details
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