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Financial instruments - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) MWh | Dec. 31, 2023 USD ($) | May 23, 2019 USD ($)
Fair Value of Financial Instruments [Line Items] |  |  |
Unrealized gains (loss) in AOCI to be reclassified | $ (4,176,000) |  |
Foreign currency gain (loss) | $ 34,447,000 | $ (5,386,000) |
U.S. dollar Subordinated unsecured notes | Senior Unsecured Notes |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |
Par value |  |  | $ 350,000,000
Swap |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |
Commodity volumes, gas | MWh | 1,784,301,000 |  |
Canadian Investments and Subsidiaries |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |
Foreign currency gain (loss) | $ 49,016,000 | (12,330,000) |
Foreign exchange contract |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |
Foreign currency gain (loss) | $ 5,848,000 | $ (6,976,000) |

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