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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 | Sep. 01, 2023 | Sep. 01, 2022 | Sep. 01, 2021
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Public Utilities, General Disclosures [Line Items] |  |  |
Approved Increase in Rate Base |  | $ 95.7 | $ 104.5
Annual Increase in Revenue |  | $ 6.8 | $ 13.5
Subsequent event |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved Increase in Rate Base | $ 157.0 |  |
Annual Increase in Revenue | $ 14.5 |  |

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