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Share-based payment arrangements - Summary of range of exercise prices of outstanding share options (Details) | 12 Months Ended |  |
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Dec. 31, 2020 CAD ($) shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 5,092,388 | 5,714,491 | 5,591,228
Option outstanding, Weighted average exercise price | $ 11.56 | $ 14.08 | $ 22.56
Employee stock option plan |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 5,092,388 |  |
Option outstanding, weighted average remaining contractual life (years) | 2 years 6 months |  |
Option outstanding, Weighted average exercise price | $ 11.56 |  |
Shares, exercisable (in shares) | shares | 2,416,611 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 14.45 |  |
Employee stock option plan | $5.00 to $5.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 1,715,345 |  |
Option outstanding, weighted average remaining contractual life (years) | 3 years 2 months 12 days |  |
Option outstanding, Weighted average exercise price | $ 5.68 |  |
Shares, exercisable (in shares) | shares | 562,607 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 5.68 |  |
Employee stock option plan | $5.00 to $5.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 5.00 |  |
Employee stock option plan | $5.00 to $5.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 5.99 |  |
Employee stock option plan | $6.00 to $6.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 543,509 |  |
Option outstanding, weighted average remaining contractual life (years) | 2 years 3 months 18 days |  |
Option outstanding, Weighted average exercise price | $ 6.20 |  |
Shares, exercisable (in shares) | shares | 292,515 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 6.20 |  |
Employee stock option plan | $6.00 to $6.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 6.00 |  |
Employee stock option plan | $6.00 to $6.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 6.99 |  |
Employee stock option plan | $10.00 to $10.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 152,941 |  |
Option outstanding, weighted average remaining contractual life (years) | 3 years 10 months 24 days |  |
Option outstanding, Weighted average exercise price | $ 10.40 |  |
Shares, exercisable (in shares) | shares | 0 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 0 |  |
Employee stock option plan | $10.00 to $10.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 10.00 |  |
Employee stock option plan | $10.00 to $10.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 10.99 |  |
Employee stock option plan | $11.00 to $11.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 189,812 |  |
Option outstanding, weighted average remaining contractual life (years) | 4 years 6 months |  |
Option outstanding, Weighted average exercise price | $ 11.56 |  |
Shares, exercisable (in shares) | shares | 0 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 0 |  |
Employee stock option plan | $11.00 to $11.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 11.00 |  |
Employee stock option plan | $11.00 to $11.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 11.99 |  |
Employee stock option plan | $12.00 to $12.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 860,643 |  |
Option outstanding, weighted average remaining contractual life (years) | 4 years 2 months 12 days |  |
Option outstanding, Weighted average exercise price | $ 12.90 |  |
Shares, exercisable (in shares) | shares | 0 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 0 |  |
Employee stock option plan | $12.00 to $12.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 12.00 |  |
Employee stock option plan | $12.00 to $12.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 12.99 |  |
Employee stock option plan | $13.00 to $13.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 68,649 |  |
Option outstanding, weighted average remaining contractual life (years) | 4 years 3 months 18 days |  |
Option outstanding, Weighted average exercise price | $ 13.50 |  |
Shares, exercisable (in shares) | shares | 0 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 0 |  |
Employee stock option plan | $13.00 to $13.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 13.00 |  |
Employee stock option plan | $13.00 to $13.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 13.99 |  |
Employee stock option plan | $16.00 to $16.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 783,341 |  |
Option outstanding, weighted average remaining contractual life (years) | 1 month 6 days |  |
Option outstanding, Weighted average exercise price | $ 16.10 |  |
Shares, exercisable (in shares) | shares | 783,341 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 16.10 |  |
Employee stock option plan | $16.00 to $16.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 16.00 |  |
Employee stock option plan | $16.00 to $16.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 16.99 |  |
Employee stock option plan | $21.00 to $21.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 20,000 |  |
Option outstanding, weighted average remaining contractual life (years) | 9 months 18 days |  |
Option outstanding, Weighted average exercise price | $ 21.15 |  |
Shares, exercisable (in shares) | shares | 20,000 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 21.15 |  |
Employee stock option plan | $21.00 to $21.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 21.00 |  |
Employee stock option plan | $21.00 to $21.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 21.99 |  |
Employee stock option plan | $22.00 to $22.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 603,766 |  |
Option outstanding, weighted average remaining contractual life (years) | 1 year 1 month 6 days |  |
Option outstanding, Weighted average exercise price | $ 22.00 |  |
Shares, exercisable (in shares) | shares | 603,766 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 22.00 |  |
Employee stock option plan | $22.00 to $22.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 22.00 |  |
Employee stock option plan | $22.00 to $22.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 22.99 |  |
Employee stock option plan | $23.00 to $23.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 151,933 |  |
Option outstanding, weighted average remaining contractual life (years) | 1 year 2 months 12 days |  |
Option outstanding, Weighted average exercise price | $ 23.18 |  |
Shares, exercisable (in shares) | shares | 151,933 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 23.18 |  |
Employee stock option plan | $23.00 to $23.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 23.00 |  |
Employee stock option plan | $23.00 to $23.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 23.99 |  |
Employee stock option plan | $29.00 to $29.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | shares | 2,449 |  |
Option outstanding, weighted average remaining contractual life (years) | 4 months 24 days |  |
Option outstanding, Weighted average exercise price | $ 29.55 |  |
Shares, exercisable (in shares) | shares | 2,449 |  |
Weighted average exercise price, exercisable (in CDN$) | $ | $ 29.55 |  |
Employee stock option plan | $29.00 to $29.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 29.00 |  |
Employee stock option plan | $29.00 to $29.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise price (in $CDN per share) | $ 29.99 |  |

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