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Regulatory and Rate Matters - TNMP Narrative (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
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Jan. 25, 2024 | May 26, 2023 | Dec. 31, 2023 | Feb. 28, 2023 | Feb. 28, 2022 | Feb. 28, 2021
Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested increase annual distribution revenue requirement | $ 13.1 |  |  |  |  |
Incremental distribution investments | $ 97.4 |  |  |  |  |
TNMP |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Regulatory disallowance |  |  | $ 1.2 |  |  |
TNMP | 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

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