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Contingencies (Details) - Environmental Clean-Up and Remediation - GOLDEN STATE WATER COMPANY $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($) item
Loss Contingencies [Line Items]
Number Of Plant Facility | item	1
Environmental Remediation Expense	$ 6.1
Amount spent in clean-up and remediation activities [Abstract]	1.5
Accrued liability for the estimated additional cost to complete the clean-up at the site	$ 1.3
Term estimate for the environmental cleanup	2 years

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Term estimate to complete the environmental clean-up

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

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The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

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