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Regulatory and Rate Matters - TNMP Narrative (Details) - TNMP customer in Thousands, $ in Millions |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 08, 2024 customer | Sep. 28, 2023 USD ($) | Sep. 30, 2024 USD ($) | Oct. 24, 2024 USD ($) | Aug. 28, 2024 USD ($) | Mar. 01, 2022 USD ($)
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Energy efficiency cost recovery, requested change amount |  |  |  |  |  | $ 7.3
Energy efficiency cost recovery, requested bonus |  |  |  |  |  | $ 1.9
Energy efficiency cost recovery factor, recovery |  | $ 6.6 |  |  |  |
Energy efficiency cost recovery factor, approved performance bonus |  | $ 1.2 |  |  |  |
System Resiliency Plan |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Capital investment |  |  |  |  | $ 600.0 |
Cost related to investment |  |  |  |  | $ 151.0 |
Hurricane |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Number of customers without power | customer | 116 |  |  |  |  |
Incurred cost without power due to natural disaster |  |  | $ 47.2 |  |  |
Hurricane | Public Utilities, Property, Plant and Equipment, Plant in Service |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Incurred cost without power due to natural disaster |  |  | 28.6 |  |  |
Hurricane | Other Deferred Charges |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Incurred cost without power due to natural disaster |  |  | $ 18.6 |  |  |
Subsequent Event |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Energy efficiency cost recovery, requested bonus |  |  |  | $ 7.0 |  |
Energy efficiency cost recovery factor, approved performance bonus |  |  |  | $ 1.3 |  |

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