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Long-term investments - Footnote Narrative (Details) - USD ($) $ in Thousands | Dec. 12, 2024 | Dec. 31, 2024 | Dec. 11, 2024 | Dec. 31, 2023
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Regulated Services Group |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Noncontrolling interest in partnerships and joint ventures |  | $ 38,113 |  | $ 112,680
Regulated Services Group | Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net assets |  | $ 0 |  | $ 73,737
Atlantica |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity interest (percent) |  |  | 42.00% | 42.00%
Proceeds from sale of its stake in Atlantica | $ 1,077,184 |  |  |
Regulated Services Group | Regulated Services Group |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity interest (percent) |  | 9.80% |  |
San Antonio Water System |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Aggregate cost |  | $ 25,634 |  | $ 25,634

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