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Share-based compensation - Disclosure of number and weighted average exercise prices of share options (Details) | 12 Months Ended
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Dec. 31, 2019 CAD ($) share | Dec. 31, 2018 CAD ($) share
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of share options outstanding, beginning of period | share | 4,305,980 | 3,537,123
Weighted average exercise price share options, beginning of period | $ | $ 14.49 | $ 14.90
Number of share options granted | share | 1,292,200 | 886,900
Weighted average exercise price of share options granted | $ | $ 13.51 | $ 12.85
Number of share options exercised | share | (1,355,531) | 0
Weighted average exercise price of share options exercised | $ | $ 14.59 | $ 0
Number of share options forfeited | share | (151,800) | (70,467)
Weighted average exercise price of share options forfeited | $ | $ 13.74 | $ 14.43
Number of share options expired | share | (7,999) | (44,866)
Weighted average exercise price of share options expired | $ | $ 15.80 | $ 15.15
Number of share options outstanding, end of period | share | 4,939,344 | 4,305,980
Weighted average exercise price share options, end of period | $ | $ 14.40 | $ 14.49
Number of share options exercisable | share | 2,988,713 | 2,720,879
Weighted average exercise price of share options exercisable | $ | $ 14.87 | $ 14.72
Barkerville replacement share options [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of share options granted | share | 1,005,478 | 0
Weighted average exercise price of share options granted | $ | $ 14.89 | $ 0.00
Virginia replacement share options [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of share options exercised | share | (148,984) | (2,710)
Weighted average exercise price of share options exercised | $ | $ 11.51 | $ 13.93

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