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Revenues - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2024
item
Jun. 30, 2023
USD ($)
ASUS | Minimum      
Disaggregation of Revenue [Line Items]      
Period of fixed price contracts to operate and maintain water systems at various military bases   15 years  
ASUS | Maximum      
Disaggregation of Revenue [Line Items]      
Period of fixed price contracts to operate and maintain water systems at various military bases   50 years  
Golden State Water Company and Bear Valley Electric Service Inc. | Sales | Customer Concentration Risk      
Disaggregation of Revenue [Line Items]      
Concentration risk, percentage   90.00%  
Bay State Utility Service LLC (" BSUS")      
Disaggregation of Revenue [Line Items]      
Number of contracts with 15 year contract | item   1  
Contracted services: | Bay State Utility Service LLC (" BSUS")      
Disaggregation of Revenue [Line Items]      
Period of fixed price contracts to operate and maintain water systems at various military bases   15 years  
Water:      
Disaggregation of Revenue [Line Items]      
Retroactive water revenues impact as a result of a proposed decision     $ 32.0
Water: | Cost of capital proceeding      
Disaggregation of Revenue [Line Items]      
Revenue impact due to lower cost of debt $ 9.3   $ 6.4