Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Share capital - Disclosure of number and weighted average exercise prices of share options (Details)

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Share capital - Disclosure of number and weighted average exercise prices of share options (Details)
$ / shares in Thousands
12 Months Ended
Nov. 19, 2019
USD ($)
shares
Nov. 19, 2019
CAD ($)
shares
Dec. 31, 2019
CAD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
shares
Dec. 31, 2019
CAD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2018
CAD ($)
shares
Reconciliation of stock options outstanding [Abstract]                
Outstanding – Beginning of year (in shares)           7,591,000 4,864,000 4,864,000
Granted pursuant to Stock Option Plan (in shares) | shares 50,000 50,000       2,520,000 3,003,000 3,003,000
Granted pursuant to Section 613(c) of TSX manual (in shares) | shares           1,600,000 0 0
Exercised (in shares) | shares           (3,580,000) (276,000) (276,000)
Forfeited (in shares) | shares           (309,000) 0 0
Outstanding – End of year (in shares)     6,172     7,822,000 7,591,000 7,591,000
Options exercisable – End of year (in shares) | shares     3,417,000   3,417,000 3,417,000   4,510,000
Reconciliation of weighted average excercise price, stock options [Abstract]                
Weighted average exercise price of share options outstanding in share-based payment arrangement, opening balance (in dollars per share)         $ 5.51     $ 4.80
Weighted average exercise price of share options granted in share-based payment arrangement (in dollars per share) $ 5,730.00 $ 7,590.00     8.14     6.54
Weighted average exercise price of share options granted pursuant to Section 613 (c) of TSX manual in share-based payment arrangement (in dollars per share)       $ 8.45     $ 0.00  
Weighted average exercise price of share options exercised in share-based payment arrangement (in dollars per share)         5.09     4.40
Weighted average exercise price of share options forfeited in share-based payment arrangement (in dollars per share)         6.88     0.00
Weighted average exercise price of share options outstanding in share-based payment arrangement, closing balance (in dollars per share)         7.04     5.51
Weighted average exercise price of share options exercisable in share-based payment arrangement     $ 6.10   $ 6.10 $ 6.10   $ 5.03