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Regulatory and Rate Matters - TNMP Schedules (Details) - Texas-New Mexico Power Company - USD ($) $ in Millions |  |  |  |  |  |  | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 20, 2021 | Mar. 12, 2021 | Oct. 07, 2020 | Mar. 27, 2020 | Sep. 19, 2019 | Mar. 21, 2019 | Dec. 31, 2021 | Feb. 28, 2021 | Feb. 29, 2020
Energy efficiency costs |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Aggregate Collection Amount |  |  |  |  |  |  | $ 5.9 | $ 5.9 | $ 5.6
Performance Bonus |  |  |  |  |  |  | $ 1.0 | $ 0.8 | $ 0.8
Transmission Cost of Service Rates |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved Increase in Rate Base | $ 41.2 | $ 112.6 | $ 10.8 | $ 59.2 | $ 21.9 | $ 111.8 |  |  |
Annual Increase in Revenue | $ 6.3 | $ 14.1 | $ 2.0 | $ 7.8 | $ 3.3 | $ 14.3 |  |  |

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