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Contingencies (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) customer | Dec. 31, 2019 USD ($)
Contingencies |  |
Loss Contingency Number of Customers Served | customer | 2,900 |
Proceeds from Sale of Other Assets | $ 34.3 |
Gain (Loss) on Disposition of Assets | $ 8.3 |
Term estimate for the environmental cleanup |  | 2 years
Environmental Clean-Up and Remediation | GSWC |  |
Contingencies |  |
Amount spent in clean-up and remediation activities |  | $ 6.3
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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