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Regulatory and Rate Matters - Schedule of Interim Distribution Rate Increases (Details) - Texas-New Mexico Power Company - Periodic Distribution Rate Adjustment - USD ($) $ in Millions | Nov. 17, 2024 | Jul. 28, 2024 | Sep. 01, 2023 | Sep. 01, 2022
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Public Utilities, General Disclosures [Line Items] |  |  |  |
Approved Increase in Rate Base |  | $ 205.9 | $ 157.0 | $ 95.7
Annual Increase in Revenue |  | $ 15.6 | $ 14.5 | $ 6.8
Forecast |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Approved Increase in Rate Base | $ 43.7 |  |  |
Annual Increase in Revenue | $ 7.7 |  |  |

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