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Share capital - Changes in stock option plan (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2023 shares $ / shares | Dec. 31, 2022 shares $ / shares
Disclosure of classes of share capital [abstract] |  |
Beginning balance (in shares) | shares | 4,851 | 5,756
Granted (in shares) | shares |  | 1,291
Exercised (in shares) | shares | (2,401) | (755)
Forfeited (in shares) | shares | (158) | (1,213)
Expired (in shares) | shares | (562) | (228)
Ending balance (in shares) | shares | 1,730 | 4,851
Beginning balance (in CAD per share) | $ / shares | $ 1,590,000 | $ 1,580,000
Granted (in CAD per share) | $ / shares |  | 2,180,000
Exercised (in CAD per share) | $ / shares | 1,200,000 | 1,170,000
Forfeited (in CAD per share) | $ / shares | 2,020,000.00 | 1,980,000
Expired (in CAD per share) | $ / shares | 2,090,000.00 | 3,890,000
Ending balance (in CAD per share) | $ / shares | $ 1,930,000 | $ 1,590,000

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