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Short-term and Long-term Borrowings (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Cal Water        
Debt Instrument [Line Items]        
Outstanding borrowings   $ 215,000,000   $ 130,000,000
Parent Company        
Debt Instrument [Line Items]        
Outstanding borrowings   $ 65,000,000   $ 50,000,000
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 600,000,000   $ 600,000,000  
Debt instrument, term 5 years      
Average borrowing rate   6.38% 5.49%  
Revolving Credit Facility | Base Rate | Minimum        
Debt Instrument [Line Items]        
Interest rate 0.00%      
Revolving Credit Facility | Base Rate | Maximum        
Debt Instrument [Line Items]        
Interest rate 0.25%      
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum        
Debt Instrument [Line Items]        
Interest rate 0.80%      
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum        
Debt Instrument [Line Items]        
Interest rate 1.25%      
Revolving Credit Facility | Cal Water        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 400,000,000   $ 400,000,000  
Incremental expansion of borrowing capacity 150,000,000   150,000,000  
Revolving Credit Facility | Parent Company        
Debt Instrument [Line Items]        
Maximum borrowing capacity 200,000,000   200,000,000  
Incremental expansion of borrowing capacity $ 50,000,000   $ 50,000,000