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Short-term and Long-term Borrowings (Details) - USD ($)
3 Months Ended
Mar. 29, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Parent Company        
Debt Instrument [Line Items]        
Outstanding borrowings   $ 95,000,000.0   $ 100,000,000
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 550,000,000.0      
Debt instrument, term 5 years      
Average borrowing rate   0.98% 2.59%  
Revolving Credit Facility | Parent Company        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 150,000,000.0      
Incremental expansion of borrowing capacity 50,000,000.0      
Cal Water        
Debt Instrument [Line Items]        
Outstanding borrowings   $ 340,000,000.0   $ 270,000,000.0
Cal Water | Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity 400,000,000.0      
Incremental expansion of borrowing capacity $ 150,000,000.0