Contingencies (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) item
ASUS
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