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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Apr. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Maximum collection period in which deferred net WRAM and MCBA revenues and associated costs will be recognized |  |  |  | 24 months |  |
Funds received from government program |  |  |  |  |  | $ 82,000,000
Decrease to past due customer balances |  | $ 57,500,000 |  |  |  |
IRMA Long-term Regulatory Liability |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Regulated revenue | $ 0 |  | $ 0 | $ 88,600,000 | $ 0 |
MWRAM |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Regulated revenue | $ 9,400,000 |  |  | $ 29,800,000 |  |

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