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Commitments and Contingent Liabilities (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
gal
l
Jun. 30, 2024
USD ($)
Commitments and Contingent Liabilities [Line Items]        
Average purchase of gallons | l     47  
Operating lease expires     January 2030  
Estimated incremental borrowing rate 4.03%   4.03%  
Operating leases, lease expense | $ $ 0.2 $ 0.2 $ 0.4 $ 0.4
Estimated obligation expenditure | $     $ 18.2  
Purchase Commitment [Member]        
Commitments and Contingent Liabilities [Line Items]        
Purchase commitment expiration date of contract     Nov. 30, 2048  
Water Supply [Member]        
Commitments and Contingent Liabilities [Line Items]        
Average purchase of gallons | gal     27,000,000  
NJBPU-Regulated Water [Member]        
Commitments and Contingent Liabilities [Line Items]        
Purchase commitment expiration date of contract     Feb. 27, 2031  
Average purchase of gallons | l     3  
Treated Water [Member]        
Commitments and Contingent Liabilities [Line Items]        
Average purchase of gallons | gal     75,000,000