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Share-based payment arrangements - Additional information (Details) $ / shares in Units, $ in Thousands | 2 Months Ended | 12 Months Ended |  |  |
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Feb. 22, 2022 CAD ($) shares | Dec. 31, 2021 shares tranche $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Number of share options granted (in shares) |  | 1,091,891 | 1,156,744 |  |  |  |  |
Employee stock option plan |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Term of employee option plan |  | 5 years |  |  |  |  |  |
Number of tranches | tranche |  | 3 |  |  |  |  |  |
Vesting percentage on first anniversary |  | 33.33% |  |  |  |  |  |
Vesting percentage on second anniversary |  | 33.33% |  |  |  |  |  |
Vesting percentage on third anniversary |  | 33.33% |  |  |  |  |  |
Number of share options available to grant under the plan (in shares) |  | 4,427,408 | 3,898,038 |  |  |  |  |
Number of share purchase options vested and exercisable (in shares) |  | 2,254,702 | 2,416,611 |  |  |  |  |
Weighted average exercise price of share purchase options vested and exercisable (in Cdn$ per share) | $ / shares |  | $ 11.51 | $ 14.45 |  |  |  |  |
Weighted average share price at date of options exercised (in Cdn$ per share) | $ / shares |  | $ 13.26 | $ 14.47 |  |  |  |  |
Weighted average fair value per equity instrument granted (in $CDN per share) | $ |  |  |  | $ 5.62 |  | $ 4.12 |  |
Restricted share unit plan |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Maximum number of shares reserved for issue under options |  |  |  |  | 5,000,000 |  |  |
Number of share purchased held in trust share-based payment arrangement (in shares) |  | 268,283 |  |  |  |  |  |
Number of share purchase options vested and exercisable (in shares) |  |  |  |  | 109,649 |  | 44,748 |
Restricted share unit plan | Major ordinary share transactions |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Number of shares purchased on open market | 1,269,900 |  |  |  |  |  |  |
Payments for shares purchased on open market | $ | $ 15,526,000 |  |  |  |  |  |  |
Restricted share units with no performance criteria |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Vesting percentage on first anniversary |  | 33.33% |  |  |  |  |  |
Vesting percentage on second anniversary |  | 33.33% |  |  |  |  |  |
Vesting percentage on third anniversary |  | 33.33% |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) |  | 180,132 | 149,552 |  |  |  |  |
Weighted average fair value per equity instrument granted (in $CDN per share) | $ / shares |  | $ 13.79 |  |  |  |  |  |
Number of shares outstanding |  |  |  |  | 471,762 |  | 478,067 | 536,330
Restricted Shares With Performance Criteria |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Term of employee option plan |  | 3 years |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) |  | 440,508 | 299,112 |  |  |  |  |
Number of shares outstanding |  |  |  |  | 908,377 |  | 689,967 | 457,498
Restricted Shares With Performance Criteria | Bottom of range |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Performance target award (range) |  | 0.00% |  |  |  |  |  |
Restricted Shares With Performance Criteria | Top of range |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Performance target award (range) |  | 200.00% |  |  |  |  |  |
Restricted Shares With Performance Criteria, Performance Criteria Not Met |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) |  | 360,273 |  |  |  |  |  |
Weighted average fair value per equity instrument granted (in $CDN per share) | $ / shares |  | $ 22.46 |  |  |  |  |  |
Restricted Shares With Performance Criteria, Performance Criteria Met |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) |  | 80,235 |  |  |  |  |  |
Deferred Share Units Plans |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  | 351,232 |  | 289,360 |
Liabilities from share-based payment transactions | $ |  |  |  |  | $ 3,291 |  | $ 3,834 |
Performance Share Unit |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Maximum number of shares reserved for issue under options |  |  |  |  | 3,126,000 |  |  |
Number of share options granted in share-based payment arrangement (in shares) |  | 267,936 | 0 |  |  |  |  |
Number of shares outstanding |  |  |  |  | 278,020 |  | 525,605 | 610,885
Performance Share Unit | Bottom of range |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Performance target award (range) |  | 0.00% |  |  |  |  |  |
Performance Share Unit | Top of range |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Performance target award (range) |  | 200.00% |  |  |  |  |  |
Performance Share Unit, Performance Criteria Not Met |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) |  | 13,937 | 0 |  |  |  |  |
Weighted average fair value per equity instrument granted (in $CDN per share) | $ / shares |  | $ 24.40 | $ 0 |  |  |  |  |
Performance Share Unit, Performance Criteria Met |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) |  | 253,999 |  |  |  |  |  |

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