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Regulatory Matters - Regulatory Proceedings (Details) - USD ($) $ in Thousands | Aug. 01, 2023 | Jun. 22, 2023 | Apr. 27, 2023 | Nov. 10, 2022
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CalPeco Electric System |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Approved revenue increase |  |  | $ 26,979 |
St, Lawrence Gas |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Approved revenue increase |  | $ 5,249 |  |
Empire Electric System - Missouri |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Securitization of qualified extraordinary costs requested |  |  |  | $ 362,420
Empire Electric System - Missouri | Subsequent Event |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Securitization of qualified extraordinary costs affirmed | $ 290,383 |  |  |
Estimated one-time loss on securitization | $ 45,000 |  |  |

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