Income taxes (Earnings and income taxes by jurisdiction) (Details) - CAD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Disclosure of geographical areas [line items] | ||
| Earnings (loss) before income taxes | $ 777,261,000 | $ 256,716,000 |
| Current income taxes | 10,757,000 | 33,578,000 |
| Deferred income taxes (recovery) | 176,962,000 | 51,296,000 |
| Income tax expense | 187,719,000 | 84,874,000 |
| Canada [member] | ||
| Disclosure of geographical areas [line items] | ||
| Earnings (loss) before income taxes | 783,843,000 | 401,080,000 |
| Current income taxes | 2,100,000 | 24,149,000 |
| Deferred income taxes (recovery) | 180,805,000 | 39,115,000 |
| Foreign [Member] | ||
| Disclosure of geographical areas [line items] | ||
| Earnings (loss) before income taxes | (6,582,000) | (144,364,000) |
| Current income taxes | 8,657,000 | 9,429,000 |
| Deferred income taxes (recovery) | (3,843,000) | 12,181,000 |
| Switzerland [Member] | ||
| Disclosure of geographical areas [line items] | ||
| Income tax expense | $ 3,307,800 | $ 4,005,000 |
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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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