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Share-based payment arrangements - Summary of movements in number of share options outstanding and weighted average exercise prices (Details) | 12 Months Ended
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Dec. 31, 2022 shares $ / shares | Dec. 31, 2021 shares $ / shares
Weighted average price CDN$ |  |
Beginning balance (in dollars per share) | $ / shares | $ 11.32 | $ 11.56
Granted (in dollars per share) | $ / shares | 13.92 | 13.27
Exercised (in dollars per share) | $ / shares | 6.42 | 6.36
Expired (in dollars per share) | $ / shares | 22.28 | 16.27
Forfeited (in dollars per share) | $ / shares | 13.62 | 12.68
Ending balance (in dollars per share) | $ / shares | $ 11.32 | $ 11.32
Number of options |  |
Beginning balance (in shares) | shares | 4,250,738 | 5,092,388
Granted (in shares) | shares | 1,265,672 | 1,091,891
Exercised (in shares) | shares | (885,750) | (339,540)
Expired (in shares) | shares | (646,583) | (803,771)
Forfeited (in shares) | shares | (234,847) | (790,230)
Ending balance (in shares) | shares | 3,749,230 | 4,250,738

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