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Contingencies (Details) - Environmental Clean-Up and Remediation - GOLDEN STATE WATER COMPANY $ in Millions	Mar. 31, 2025 USD ($) plantSite
Loss Contingencies [Line Items]
Number of plant facilities | plantSite	1
Environmental costs recognized, capitalized	$ 6.8
Environmental loss contingencies paid by third party	1.5
Accrued liability for the estimated additional cost to complete the clean-up at the site	$ 1.3

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of costs recognized in the balance sheet for known or estimated future costs arising from requirements to perform activities to remediate one or more sites.

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