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Financial instruments - Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2024 $ / $ | Dec. 31, 2024 | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 $ / shares
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Recovery of contributions to long-term investments | $ 0 | $ 1,000,000 |  |  |  |
Gains (losses) on financial assets at fair value through profit or loss | 14,788,000 | 12,897,000 |  |  |  |
Expected credit losses | $ 500,000 |  |  |  |  |
Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Exposure to risk holding Canadian denominated cash and cash equivalents, percentage (up to) | 100.00% |  |  |  |  |
Exposure to risk holding Canadian dollar net expenditures, percentage (up to) | 50.00% |  |  |  |  |
Average price of hedging instrument (CDN per USD) |  |  | 1.36 |  |  | 1.00
Reasonably possible change in risk variable, percent |  |  |  | 10.00% |  |
Increase in the corresponding risk variable on income | $ 6,938,000 |  |  |  |  |
Currency risk | Cash and cash equivalents |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Risk exposure associated with instruments sharing characteristic |  |  |  |  | $ 68,322 |
Currency risk | Foreign exchange contracts |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Risk exposure associated with instruments sharing characteristic |  |  |  |  | $ 17,500 |
Interest rate risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Reasonably possible change in risk variable, percent |  |  |  | 1.00% |  |
Decrease in the corresponding risk variable on investment income | 6,044,000 |  |  |  |  |
Forsee Power |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Gains (losses) on financial assets at fair value through profit or loss | $ 14,788,000 | $ 12,897,000 |  |  |  |

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