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Commitments and Contingent Liabilities (Details)
gal in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
gal
l
Mar. 31, 2023
USD ($)
Commitments and Contingent Liabilities [Line Items]    
Estimated incremental borrowing rate 4.03%  
Rental expenses under operating leases | $ $ 0.2 $ 0.2
Construction program expenses | $ 78.0  
Estimated obligation expenditure | $ $ 14.0  
Water Supply [Member]    
Commitments and Contingent Liabilities [Line Items]    
Average purchase of gallons | gal 27  
Purchase Commitment [Member]    
Commitments and Contingent Liabilities [Line Items]    
Purchase commitment expiration date of contract Nov. 30, 2048  
Average purchase of gallons | l 47  
Regulated Water Utility [Member]    
Commitments and Contingent Liabilities [Line Items]    
Purchase commitment expiration date of contract Feb. 27, 2026  
Average purchase of gallons | l 3  
City of Dover [Member]    
Commitments and Contingent Liabilities [Line Items]    
Average purchase of gallons | l 60,000,000