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Shareholder's capital - Schedule of Performance Stock Units (Details) - CAD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Exercisable , weighted average remaining contractual term | 3 years 8 months 23 days |  |
PSUs and RSUs |  |  |
Number of awards |  |  |
Beginning balance (in shares) | 3,577,747 | 2,109,710 |
Granted, including dividends (in shares) | 2,863,298 | 2,841,967 |
Exercised (in shares) | (416,659) | (922,883) |
Forfeited (in shares) | (833,416) | (451,047) |
Ending balance (in shares) | 5,190,970 | 3,577,747 | 2,109,710
Exercisable (in shares) | 889,318 |  |
Weighted average grant-date fair value |  |  |
Beginning balance (in USD per share) | $ 18.38 | $ 18.38 |
Granted, including dividends (in USD per share) | 7.24 | 10.98 |
Exercised (in USD per share) | 16.66 | 18.73 |
Forfeited (in USD per share) | 11.91 | 15.07 |
Ending balance (in USD per share) | 18.38 | $ 18.38 | $ 18.38
Exercisable (in USD per share) | $ 18.51 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Outstanding, weighted average remaining contractual term | 1 year 5 months 4 days | 1 year 9 months 3 days | 1 year 9 months 3 days
Granted, including dividends, weighted average remaining contractual term | 2 years 14 days | 2 years 7 days |
Outstanding, aggregate intrinsic value | $ 33,118 | $ 29,777 | $ 18,608
Granted, including dividends, aggregate intrinsic value | 20,025 | 25,329 |
Exercised, aggregate intrinsic value | 3,421 | 10,125 |
Forfeited, aggregate intrinsic value | 5,317 | $ 3,771 |
Exercisable, aggregate intrinsic value | $ 5,674 |  |

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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