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Share-based payment arrangements - Summary of Range of Exercise Prices of Outstanding Share Options (Details) | Dec. 31, 2019 CAD ($) shares yr | Dec. 31, 2018 shares | Dec. 31, 2017 shares
--- | --- | --- | ---
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 5,714,491 | 5,591,228 | 5,944,510
Employee stock option plan |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 5,714,491 |  |
Weighted average remaining contractual life, outstanding (in years) | yr | 2.6 |  |
Weighted average exercise price, outstanding (in CDN$) | $ | $ 14.08 |  |
Shares, exercisable (in shares) | 2,670,039 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 21.87 |  |
Employee stock option plan | $5.00 to $5.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 2,097,795 |  |
Weighted average remaining contractual life, outstanding (in years) | yr | 4.2 |  |
Weighted average exercise price, outstanding (in CDN$) | $ | $ 5.68 |  |
Shares, exercisable (in shares) | 0 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 0.00 |  |
Employee stock option plan | $6.00 to $6.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 818,003 |  |
Weighted average remaining contractual life, outstanding (in years) | yr | 3.3 |  |
Weighted average exercise price, outstanding (in CDN$) | $ | $ 6.20 |  |
Shares, exercisable (in shares) | 250,703 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 6.20 |  |
Employee stock option plan | $10.00 to $10.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 152,941 |  |
Weighted average remaining contractual life, outstanding (in years) | yr | 4.9 |  |
Weighted average exercise price, outstanding (in CDN$) | $ | $ 10.40 |  |
Shares, exercisable (in shares) | 0 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 0.00 |  |
Employee stock option plan | $16.00 to $16.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 986,984 |  |
Weighted average remaining contractual life, outstanding (in years) | yr | 1.1 |  |
Weighted average exercise price, outstanding (in CDN$) | $ | $ 16.10 |  |
Shares, exercisable (in shares) | 986,984 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 16.10 |  |
Employee stock option plan | $21.00 to $21.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 20,000 |  |
Weighted average remaining contractual life, outstanding (in years) | yr | 1.8 |  |
Weighted average exercise price, outstanding (in CDN$) | $ | $ 21.15 |  |
Shares, exercisable (in shares) | 13,333 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 21.15 |  |
Employee stock option plan | $22.00 to $22.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 668,396 |  |
Weighted average remaining contractual life, outstanding (in years) | yr | 2.1 |  |
Weighted average exercise price, outstanding (in CDN$) | $ | $ 22.00 |  |
Shares, exercisable (in shares) | 499,293 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 22.00 |  |
Employee stock option plan | $23.00 to $23.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 151,933 |  |
Weighted average remaining contractual life, outstanding (in years) | yr | 2.2 |  |
Weighted average exercise price, outstanding (in CDN$) | $ | $ 23.18 |  |
Shares, exercisable (in shares) | 101,287 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 23.18 |  |
Employee stock option plan | $29.00 to $29.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 2,449 |  |
Weighted average remaining contractual life, outstanding (in years) | yr | 1.4 |  |
Weighted average exercise price, outstanding (in CDN$) | $ | $ 29.55 |  |
Shares, exercisable (in shares) | 2,449 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 29.55 |  |
Employee stock option plan | $33.00 to $33.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 795,990 |  |
Weighted average remaining contractual life, outstanding (in years) | yr | 0.1 |  |
Weighted average exercise price, outstanding (in CDN$) | $ | $ 33.35 |  |
Shares, exercisable (in shares) | 795,990 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 33.35 |  |
Employee stock option plan | $35.00 to $35.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Shares, outstanding (in shares) | 20,000 |  |
Weighted average remaining contractual life, outstanding (in years) | yr | 0.0 |  |
Weighted average exercise price, outstanding (in CDN$) | $ | $ 35.40 |  |
Shares, exercisable (in shares) | 20,000 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 35.40 |  |

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