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Revenues - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2023
USD ($)
Disaggregation of Revenue [Line Items]  
Revenue, remaining performance obligation, amount $ 3,500.0
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 32 years
ASUS | Maximum  
Disaggregation of Revenue [Line Items]  
Revenue, remaining performance obligation, expected timing of satisfaction, period 45 years
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%