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Rate and Regulatory Matters (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Apr. 12, 2023
Sep. 30, 2022
May 31, 2021
Jun. 30, 2023
Nov. 30, 2021
Minimum [Member]          
Rate and Regulatory Matters (Details) [Line Items]          
Deferred Income, Revenue Recognized       $ 57.0  
Maximum [Member]          
Rate and Regulatory Matters (Details) [Line Items]          
Deferred Income, Revenue Recognized       $ 57.0  
Middlesex Water [Member]          
Rate and Regulatory Matters (Details) [Line Items]          
Escrow account   $ 1.7      
Maturity Less than 30 Days [Member] | Middlesex Water Company [Member]          
Rate and Regulatory Matters (Details) [Line Items]          
Escrow account         $ 1.7
New Jersey Board of Public Utilities [Member] | Middlesex Water [Member]          
Rate and Regulatory Matters (Details) [Line Items]          
Approved increase in annual operating revenues   $ 2.7 $ 34.0    
New Jersey Board of Public Utilities [Member] | Pinelands [Member]          
Rate and Regulatory Matters (Details) [Line Items]          
Approved increase in annual operating revenues $ 1.0