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Regulatory and Rate Matters - TNMP Narrative (Details) - Texas-New Mexico Power Company - USD ($) $ in Millions | Jan. 23, 2023 | Jul. 18, 2022 | Apr. 05, 2022 | Jul. 01, 2021 | Apr. 05, 2021 | Sep. 24, 2022 | May 27, 2022
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Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Energy efficiency cost recovery factor, requested change amount |  |  |  |  |  |  | $ 7.4
Energy efficiency cost recovery factor, requested performance bonus |  |  |  |  |  | $ 1.9 | $ 1.9
Energy efficiency cost recovery factor, settlement amount |  |  |  |  |  | $ 7.3 |
Requested increase annual distribution revenue requirement |  | $ 6.8 | $ 9.7 | $ 13.5 | $ 14.0 |  |
Incremental distribution investments |  |  |  |  | $ 104.5 |  |
Increase in rate base |  |  | $ 100.7 |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested increase annual distribution revenue requirement | $ 19.4 |  |  |  |  |  |
Incremental distribution investments | $ 150.5 |  |  |  |  |  |

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