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Short-term and Long-term Borrowings (Details) - Revolving Credit Facility - USD ($)
9 Months Ended
Mar. 29, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 550,000,000.0      
Debt instrument, term 5 years      
Average borrowing rate   1.74% 3.38%  
Parent Company        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 150,000,000.0      
Incremental expansion of borrowing capacity 50,000,000.0      
Outstanding borrowings   $ 105,100,000   $ 55,100,000
Cal Water        
Debt Instrument [Line Items]        
Maximum borrowing capacity 400,000,000.0      
Incremental expansion of borrowing capacity $ 150,000,000.0      
Outstanding borrowings   $ 270,000,000.0   $ 120,000,000.0