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Lines of Credit - Narrative (Details)
Dec. 31, 2023
USD ($)
Aug. 02, 2023
Feb. 06, 2023
USD ($)
Dec. 31, 2022
Oct. 31, 2022
USD ($)
Aug. 02, 2022
USD ($)
Line of Credit Facility [Line Items]            
Short-term debt, weighted average interest rate 6.48%     5.40%    
Revolving Credit Facility | Line of Credit            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity $ 350,000,000          
Revolving Credit Facility | Line of Credit | Credit Agreement            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity           $ 300,000,000
Capitalization ratio   0.70        
Revolving Credit Facility | Line of Credit | CTWS Credit Agreement Maturing August 2028            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity 10,000,000       $ 10,000  
Revolving Credit Facility | Line of Credit | CTWS Credit Agreement Maturing May 2025            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity $ 40,000,000   $ 40,000,000