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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, 2019 CAD ($) shares | Dec. 31, 2018 CAD ($) shares
Weighted average exercise price Cdn$ |  |
Weighted average exercise price, At January 1 (in Cdn per share) | $ | $ 22.56 | $ 30.18
Weighted average exercise price, Granted (in Cdn per share) | $ | 5.98 | 6.20
Weighted average exercise price, Exercised (in Cdn per share) | $ | 6.20 | 0.00
Weighted average exercise price, Expired (in Cdn per share) | $ | 38.96 | 51.46
Weighted average exercise price, Forfeited (in Cdn per share) | $ | 21.48 | 26.99
Weighted average exercise price, At December 31 (in Cdn per share) | $ | $ 14.08 | $ 22.56
Number of options |  |
Number of options, At January 1 (in shares) | shares | 5,591,228 | 5,944,510
Number of options, Regular options granted (in shares) | shares | 2,387,256 | 1,078,797
Number of options, Exercised (in shares) | shares | (56,644) | 0
Number of options, Expired (in shares) | shares | (697,322) | (870,904)
Number of options, Forfeited (in shares) | shares | (1,510,027) | (561,175)
Number of options, At December 31 (in shares) | shares | 5,714,491 | 5,591,228

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