Contingencies (Details) - Environmental Clean-Up and Remediation - GOLDEN STATE WATER COMPANY $ in Millions	Jun. 30, 2024 USD ($) item
Loss Contingencies [Line Items]
Number of plant facilities | item	1
Accrued liability for the estimated additional cost to complete the clean-up at the site	$ 1.3
Environmental Costs Recognized, Capitalized	6.7
Environmental Loss Contingencies Paid by Third Party	$ 1.5