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Regulatory and Rate Matters - Schedule of Rate Increases for Transmission Costs (Details) - TNMP - USD ($) $ in Millions | Nov. 17, 2024 | Oct. 24, 2024 | Sep. 20, 2024 | Jul. 28, 2024 | Mar. 15, 2024 | Mar. 01, 2024 | Sep. 06, 2023 | Sep. 01, 2023 | May 12, 2023 | Mar. 01, 2023 | Sep. 22, 2022 | Sep. 01, 2022 | Mar. 25, 2022 | Mar. 01, 2022
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Periodic Distribution Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Increase in Rate Base | $ 43.7 |  |  | $ 205.9 |  |  |  | $ 157.0 |  |  |  | $ 95.7 |  |
Actual annual increase annual distribution revenue requirement. | $ 7.7 |  |  | $ 15.6 |  |  |  | $ 14.5 |  |  |  | $ 6.8 |  |
PUCT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Increase in Rate Base |  |  | $ 20.6 |  | $ 97.4 |  | $ 21.4 |  | $ 150.5 |  | $ 36.0 |  | $ 95.6 |
Annual Increase in Revenue |  |  | $ 3.9 |  | $ 13.1 |  | $ 4.2 |  | $ 19.4 |  | $ 5.3 |  | $ 14.2 |
Energy efficiency costs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Collection Amount |  |  |  |  |  | $ 6.6 |  |  |  | $ 7.3 |  |  |  | $ 7.2
Performance Bonus |  | $ 1.3 |  |  |  | $ 1.2 |  |  |  | $ 1.9 |  |  |  | $ 2.3

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