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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | 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 |  |  | $ 82.0
Decrease to past due customer balances | $ 57.5 |  |
IRMA long-term regulatory liability |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated revenue | 7.9 | $ 88.6 |
MWRAM |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated revenue | $ 8.2 | $ 39.3 |

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