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Commitments and Contingent Liabilities (Narrative) (Details)
gal in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
gal
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Commitment And Contingencies [Line Items]      
Budgeted construction cost for construction program, 2022 $ 88.0    
Budgeted construction cost for construction program, 2023 83.0    
Budgeted construction cost for construction program, 2024 58.0    
Rental expenses under operating leases 0.8 $ 0.8 $ 0.7
Estimated obligation expend $ 34.0    
Estimated incremental borrowing rate 4.03%    
Lease maturity date 2030    
NJ Water Supply Authority [Member]      
Commitment And Contingencies [Line Items]      
Purchase commitment expiration date of contract Nov. 30, 2023    
Water purchase per commitment | gal 27.0    
Regulated Water Authority [Member]      
Commitment And Contingencies [Line Items]      
Purchase commitment expiration date of contract Feb. 27, 2026    
Water purchase per commitment | gal 3.0    
City of Dover [Member]      
Commitment And Contingencies [Line Items]      
Water purchase per commitment | gal 15.0