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Cash flow information (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Supplemental Cash Flow Information [Abstract] |  |  |
Interest, net | $ 68,267 | $ 74,677 |
Income taxes paid, net | 27,491 | 14,385 |
AFUDC borrowed | 5,400 | 8,400 |
Right-of-use assets obtained in exchange for new operating lease liabilities | 1,344 | 1,104 | $ 1,787
Property, plant and equipment additions in accounts payable | $ 53,653 | $ 49,393 | $ 36,820

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