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Commitments and Contingent Liabilities (Narrative) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2022
USD ($)
gal
Mar. 31, 2021
USD ($)
Purchase Commitment, Excluding Long-Term Commitment [Line Items]    
Budgeted construction cost for construction program, 2022 | $ $ 90.0  
Estimated obligation expenditure | $ 39.0  
Rental expenses under operating leases | $ $ 0.2 $ 0.2
Estimated incremental borrowing rate 4.03%  
NJ Water Supply Authority [Member]    
Purchase Commitment, Excluding Long-Term Commitment [Line Items]    
Purchase commitment expiration date of contract Nov. 30, 2023  
Water purchase per commitment | gal 27  
Regulated Water Authority [Member]    
Purchase Commitment, Excluding Long-Term Commitment [Line Items]    
Purchase commitment expiration date of contract Feb. 27, 2026  
Water purchase per commitment | gal 3  
City of Dover [Member]    
Purchase Commitment, Excluding Long-Term Commitment [Line Items]    
Water purchase per commitment | gal 15