Basis of presentation (Details) |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Mar. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Alberta Newsprint Company | |||
| Basis of Presentation [Line Items] | |||
| Proportion of ownership interest in joint operation | 50.00% | ||
| Cariboo Pulp & Paper Company | |||
| Basis of Presentation [Line Items] | |||
| Proportion of ownership interest in joint operation | 50.00% | 100.00% | 50.00% |