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Regulatory and Rate Matters - TNMP Narrative (Details) - TNMP $ in Millions | Jul. 30, 2024 USD ($) | Jul. 25, 2024 USD ($) | Jul. 08, 2024 customer | Sep. 28, 2023 USD ($) | May 31, 2024 USD ($) | Mar. 01, 2022 USD ($)
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Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Energy efficiency cost recovery, requested change amount |  |  |  |  |  | $ 7.3
Energy efficiency cost recovery, requested bonus |  |  |  |  | $ 7.0 | $ 1.9
Energy efficiency cost recovery factor, recovery |  |  |  | $ 6.6 |  |
Energy efficiency cost recovery factor, approved performance bonus |  |  |  | $ 1.2 | $ 1.3 |
Subsequent Event |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Requested increase annual distribution revenue requirement |  | $ 20.6 |  |  |  |
Incremental distribution investments |  | $ 3.9 |  |  |  |
Requested rate increase (decrease) | $ 7.8 |  |  |  |  |
Recovery of base rate | $ 43.7 |  |  |  |  |
Subsequent Event | Hurricane |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Number of customers without power | customer |  |  | 116,000 |  |  |

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