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Stock-based compensation - Narrative (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2021 | Dec. 31, 2024 CAD ($) $ / shares shares | Dec. 31, 2023 CAD ($) $ / shares shares | Dec. 31, 2020
Restricted share units (RSUs) | Liability classified restricted share unit plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Period for recognition in years following grant |  | 2 years |  |
Award vesting period |  | 3 years |  |
Restricted share units (RSUs) | Restricted share unit plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements |  | $ 6,549,000 | $ 5,662,000 |
Period for award recognition |  | 1 year 7 months 6 days | 1 year 7 months 6 days |
Vested (in shares) | shares |  | 120,109 | 256,193 |
Performance restricted share units (PSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vested (in shares) | shares |  | 61,935 | 213,623 |
Performance restricted share units (PSUs) | Restricted share unit plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements |  | $ 5,141,000 | $ 3,655,000 |
Period for award recognition |  | 1 year 8 months 12 days | 1 year 6 months |
Vested (in shares) | shares |  | 61,935 | 213,623 |
Settlement ratio, per PSU |  | 0.55 | 1.48 |
Performance restricted share units (PSUs) | Performance restricted share unit plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 3 years |  |
Performance restricted share unit plan granted to the services to be provided |  | 2 years |  |
Deferred stock units (DSUs) | Deferred stock unit plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements |  | $ 0 |  |
Vested (in shares) | shares |  | 0 | 286,152 |
Required annual fixed remuneration in form of DSUs if shareholding guidelines are met, percentage | 60.00% |  |  |
Percentage of annual bonus eligible for deferred stock units | 50.00% |  |  |
Fair market value (in CAD per share) | $ / shares |  | $ 30.06 | $ 27.90 |
Award units settled during the period |  |  | $ 7,817,000 |
Deferred stock units (DSUs) | Deferred stock unit plan | Accrued liabilities |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Current portion of award obligation |  | $ 0 | 0 |
Deferred stock units (DSUs) | Deferred stock unit plan | Other liabilities |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Non-current portion of award obligation |  | $ 24,096,000 | $ 21,361,000 |
Deferred stock units (DSUs) | Deferred stock unit plan | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Required annual fixed remuneration in form of DSUs, percentage |  |  |  | 50.00%
Required annual fixed remuneration in form of DSUs if shareholding guidelines are not met, percentage | 0.00% |  |  |
Deferred stock units (DSUs) | Deferred stock unit plan | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Required annual fixed remuneration in form of DSUs, percentage |  |  |  | 100.00%
Required annual fixed remuneration in form of DSUs if shareholding guidelines are not met, percentage | 100.00% |  |  |

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