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Long-term debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Disclosure [Abstract]
Long-term debt	$ 293,544	$ 217,672
Commercial paper, credit facility draws and related fees	100,386	119,868
Accretion of fair value adjustments	(23,000)	(21,968)
AFUDC capitalized on regulated property	(4,604)	(9,440)
Other	(2,750)	2,308
Interest expense	$ 363,576	$ 308,440

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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