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Business Combination (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Oct. 09, 2019
USD ($)
$ / shares
Oct. 08, 2019
USD ($)
Mar. 31, 2020
USD ($)
people_served
connection
municipality
Mar. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]          
Long-term borrowings     $ 35,000 $ 80,000  
Borrowings on line of credit     47,424 $ 38,000  
Assets Acquired          
Goodwill     628,287   $ 628,287
CTWS [Member]          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred, Acquiree's Common Shares Converted In Cash Per Share | $ / shares $ 70.00        
Payments to Acquire Businesses, Gross $ 838,476        
Cash Acquired from Acquisition 3,011        
Adjustments to Additional Paid in Capital, Share-based Compensation, Equity Award Assumed in Acquisition 6,384        
Long-term borrowings 18,463        
Borrowings on line of credit $ 60,000        
Assets Acquired          
Utility plant, net     750,703    
Nonutility plant     848    
Current assets     42,673    
Investments     12,489    
Regulatory assets and deferred charges, less current portion     83,132    
Other intangible assets     17,181    
Other assets     2,592    
Goodwill     626,523    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     1,536,141    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt     281,009    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities     125,772    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities     107,789    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Post-retirement Benefit Plans     31,789    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, CIAC and Advances     137,327    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities     10,607    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     694,293    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net     $ 841,848    
Connecticut Water Service, Inc. [Member]          
Business Acquisition [Line Items]          
Public Utilities, Service Connections | connection     138,000    
Public Utilities, Number of People Served | people_served     480,000    
Public Utilities, Number of Communities Served | municipality     80    
Underwritten Public Offering [Member] | Common Stock          
Business Acquisition [Line Items]          
Stock Issued During Period, Shares, New Issues | shares       7,762,000  
Proceeds from Issuance of Common Stock, Gross       $ 411,077  
Series 2019A/B/C [Member] | Senior Notes [Member] | Parent Company [Member]          
Business Acquisition [Line Items]          
Principal Debt Sold   $ 427,398      
Southbury, Connecticut [Member] | Connecticut Water Service, Inc. [Member]          
Business Acquisition [Line Items]          
Public Utilities, Service Connections | connection     3,000