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Regulatory and Rate Matters - Schedule of Transmission Cost of Service Rates (Details) - TNMP - USD ($) $ in Millions |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 22, 2023 | Sep. 01, 2023 | May 26, 2023 | Mar. 25, 2023 | Sep. 22, 2022 | Sep. 01, 2022 | Mar. 25, 2022 | Sep. 20, 2021 | Sep. 01, 2021 | Mar. 12, 2021 | Feb. 28, 2023 | Feb. 28, 2022 | Feb. 28, 2021
Energy efficiency costs |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Collection Amount |  |  | $ 6.6 |  |  |  |  |  |  |  | $ 7.3 | $ 7.2 | $ 5.9
Performance Bonus |  |  | $ 1.2 |  |  |  |  |  |  |  | $ 1.9 | $ 2.3 | $ 1.0
Transmission Cost of Service Rates |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Increase in Rate Base | $ 21.4 |  |  | $ 150.5 | $ 36.0 |  | $ 95.6 | $ 41.2 |  | $ 112.6 |  |  |
Annual Increase in Revenue | $ 4.2 |  |  | $ 19.4 | $ 5.3 |  | $ 14.2 | $ 6.3 |  | $ 14.1 |  |  |
Periodic Distribution Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Increase in Rate Base |  | $ 157.0 |  |  |  | $ 95.7 |  |  | $ 104.5 |  |  |  |
Annual Increase in Revenue |  | $ 14.5 |  |  |  | $ 6.8 |  |  | $ 13.5 |  |  |  |

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