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Contingencies (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2023 USD ($) item
ASUS | Minimum |
Loss Contingencies [Line Items] |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 15 years
ASUS | Maximum |
Loss Contingencies [Line Items] |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years
Environmental Clean-Up and Remediation | GOLDEN STATE WATER COMPANY |
Loss Contingencies [Line Items] |
Number of plant facilities | item | 1
Environmental Remediation Expense | $ 6.3
Amount spent in clean-up and remediation activities | 1.5
Accrued liability for the estimated additional cost to complete the clean-up at the site | $ 1.3

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