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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
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