Finance cost (Schedule of finance costs) (Details) - CAD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Borrowing costs [abstract] | ||
| Interest on long-term debt | $ 55,061 | $ 91,921 |
| Accretion | 40,658 | 36,243 |
| Other charges | 19,456 | 19,007 |
| Finance costs | $ 115,175 | $ 147,171 |