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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, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares
Weighted average exercise price Cdn$ |  |
Weighted average exercise price, At January 1, | $ / shares | $ 14.08 | $ 22.56
Weighted average exercise price, Granted | $ / shares | 12.72 | 5.98
Weighted average exercise price, Exercised | $ / shares | 7.75 | 6.20
Weighted average exercise price, Expired | $ / shares | 33.40 | 38.96
Weighted average exercise price, Forfeited | $ / shares | 12.53 | 21.48
Weighted average exercise price, At December 31, | $ / shares | $ 11.56 | $ 14.08
Number of options |  |
Number of options, At January 1, | shares | 5,714,491 | 5,591,228
Number of options, Granted | shares | 1,156,744 | 2,387,256
Number of options, Exercised | shares | (618,915) | (56,644)
Number of options, Expired | shares | (813,933) | (697,322)
Number of options, Forfeited | shares | (345,999) | (1,510,027)
Number of options, At December 31, | shares | 5,092,388 | 5,714,491

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