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Share capital - Changes in stock option plan (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2022 shares $ / shares | Dec. 31, 2021 shares $ / shares
Disclosure of classes of share capital [abstract] |  |
Beginning balance (in shares) | shares | 5,756 | 4,835
Granted (in shares) | shares | 1,291 | 1,708
Exercised (in shares) | shares | (755) | (203)
Forfeited (in shares) | shares | (1,213) | (339)
Expired (in shares) | shares | (228) | (245)
Ending balance (in shares) | shares | 4,851 | 5,756
Beginning balance (in CAD per share) | $ / shares | $ 1,580,000 | $ 1,590,000
Granted (in CAD per share) | $ / shares | 2,180,000 | 2,060,000.00
Exercised (in CAD per share) | $ / shares | 1,170,000 | 1,180,000
Forfeited (in CAD per share) | $ / shares | 1,980,000 | 2,000,000.00
Expired (in CAD per share) | $ / shares | 3,890,000 | 4,820,000
Ending balance (in CAD per share) | $ / shares | $ 1,590,000 | $ 1,580,000

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