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Short-term and Long-term Borrowings (Details) - Revolving Credit Facility - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]      
Average borrowing rate 2.72% 1.82%  
Parent Company      
Debt Instrument [Line Items]      
Outstanding borrowings $ 55.1   $ 55.1
Cal Water      
Debt Instrument [Line Items]      
Outstanding borrowings $ 270.0   $ 220.0