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Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Contingencies
Term estimate for the environmental cleanup	2 years
Environmental Clean-Up and Remediation | GSWC
Contingencies
Amount spent in clean-up and remediation activities	$ 6.1
Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities	1.5
Accrued liability for the estimated additional cost to complete the clean-up at the site	$ 1.3

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Represents the amount of environmental remediation costs paid by the third party.

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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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