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Revenues - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2023
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, amount $ 3,600.0   $ 3,600.0
ASUS      
Disaggregation of Revenue [Line Items]      
Period of fixed price contracts to operate and maintain water systems at various military bases     50 years
ASUS | Minimum      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, expected timing of satisfaction, period 31 years   31 years
ASUS | Maximum      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, expected timing of satisfaction, period 45 years   45 years
GSWC | Cost of capital proceeding      
Disaggregation of Revenue [Line Items]      
Revenue impact due to lower cost of debt $ 9.3 $ 2.9 $ 6.4
Contracted services: | ASUS      
Disaggregation of Revenue [Line Items]      
Period of fixed price contracts to operate and maintain water systems at various military bases     50 years
Electric: | Golden State Water Company and Bear Valley Electric Service Inc. | Sales | Customer Concentration Risk      
Disaggregation of Revenue [Line Items]      
Concentration risk, percentage     90.00%
Water:      
Disaggregation of Revenue [Line Items]      
Retroactive water revenues impact as a result of a proposed decision     $ 30.0
Water: | GSWC | Sales | Customer Concentration Risk      
Disaggregation of Revenue [Line Items]      
Concentration risk, percentage     90.00%