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Other long-term liabilities - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |  |
Transfers from advances in aid of construction to contributions in aid of construction |  | $ 672 | $ 238 |
Undiscounted, unescalated cost of environmental cleanup activities |  | 48,976 | 46,187 |
Environmental remediation obligation |  | 41,714 | 40,772 | $ 42,457
Accrual for environmental loss contingencies to be incurred over next three years |  | $ 25,038 |  |
Remaining period to incur cash flows for environmental cleanup |  | 29 years |  |
Regulatory assets |  | $ 1,321,059 | 1,327,683 |
Green Equity Units issued (in shares) | 23,000,000 |  |  |
Green Equity Units, annual distributions (percent) | 7.75% |  |  |
Green Equity Units, share purchase contract, interest rate (percent) | 6.57% |  |  |
Contract adjustment payments, excluding interest | $ 222,378 |  |  |
Contract adjustment payments, accretion period | 3 years |  |  |
Senior unsecured notes (Green Equity Units) | Senior Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from green equity units | $ 1,150,000 |  |  |
Weighted average coupon | 1.18% | 5.37% |  |
Environmental costs |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Environmental remediation, rate recovery period |  | 7 years |  |
Regulatory assets |  | $ 62,340 | $ 66,779 |
Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Other liability repayment period |  | 5 years |  |
Accrual for environmental cleanup, discount rate (percent) |  | 3.40% |  |
Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Other liability repayment period |  | 40 years |  |
Accrual for environmental cleanup, discount rate (percent) |  | 4.70% |  |

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