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Acquisitions (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 24, 2019
USD ($)
Apr. 23, 2019
USD ($)
$ / shares
Apr. 18, 2019
USD ($)
$ / shares
Oct. 22, 2018
USD ($)
customer
item
Dec. 31, 2018
USD ($)
ft
Nov. 30, 2018
USD ($)
customer
Jul. 31, 2018
USD ($)
item
customer
Sep. 30, 2019
USD ($)
item
customer
Sep. 30, 2019
USD ($)
item
customer
state
Sep. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Apr. 26, 2019
USD ($)
Oct. 23, 2018
USD ($)
Business Acquisition [Line Items]                          
Goodwill         $ 52,726,000     $ 52,701,000 $ 52,701,000        
Issuance of common stock under dividend reinvestment plan                 $ 4,819,000 $ 1,101,000      
Interest Rate Swap [Member]                          
Business Acquisition [Line Items]                          
Debt instrument, issued $ 900,000,000                        
Water And Wastewater Utility Systems [Member]                          
Business Acquisition [Line Items]                          
Number of acquisitions | item             5   7        
Number of customers | customer             7,200   8,661        
Total purchase price             $ 46,450,000   $ 42,519,000        
Number of states company operates in | state                 3        
LDC Funding LLC [Member]                          
Business Acquisition [Line Items]                          
Issuance of common stock under dividend reinvestment plan   $ 1,293,750,000                      
Proceeds from tangible equity units   $ 690,000,000                      
Private placement, per share | $ / shares   $ 50                      
Pennsylvania [Member] | Interest Rate Swap [Member]                          
Business Acquisition [Line Items]                          
Interest rate swap                         $ 850,000,000
Pennsylvania [Member] | Wastewater Utility System [Member]                          
Business Acquisition [Line Items]                          
Number of customers | customer           4,950              
Total purchase price           $ 21,000,000              
Pennsylvania [Member] | Valley Creek Trunk Sewer System [Member]                          
Business Acquisition [Line Items]                          
Total purchase price         $ 28,300,000                
Systeme length | ft         49,000                
Pennsylvania [Member] | LDC Funding LLC [Member]                          
Business Acquisition [Line Items]                          
Number of acquisitions | item       5                  
Number of customers | customer       740,000                  
Total purchase price       $ 4,275,000,000                  
Outstanding debt       1,432,000,000                  
Repayments of Debt                 $ 4,350,000,000        
Stock purchase agreement     $ 750,000,000                    
Issuance of common stock under dividend reinvestment plan     1,293,750,000                    
Debt available               750,000,000 750,000,000        
Proceeds from tangible equity units     $ 690,000,000                    
Private placement, per share | $ / shares     $ 50                    
Pennsylvania [Member] | LDC Funding LLC [Member] | Senior Notes [Member]                          
Business Acquisition [Line Items]                          
Debt instrument, issued                       $ 900,000,000  
Proceeds from debt $ 83,520,000                        
Pennsylvania [Member] | LDC Funding LLC [Member] | Senior Unsecured Notes [Member] | Letter of Credit [Member]                          
Business Acquisition [Line Items]                          
Debt instrument, issued       $ 5,100,000,000                  
Pennsylvania [Member] | Peoples Gas Acquisition [Member]                          
Business Acquisition [Line Items]                          
Contingent consideration               $ 120,000,000 $ 120,000,000        
Limerick [Member] | Wastewater Utility System [Member]                          
Business Acquisition [Line Items]                          
Number of customers | customer             5,497            
Total purchase price             $ 74,836,000            
Acquired property, plant and equipment             64,759,000            
Goodwill             $ 10,790,000            
Cheltenham Township [Member] | Wastewater Utility System [Member]                          
Business Acquisition [Line Items]                          
Number of customers | customer             10,500            
Total purchase price             $ 50,250,000            
Cheltenham Township [Member] | Scenario, Forecast [Member] | Wastewater Utility System [Member]                          
Business Acquisition [Line Items]                          
Goodwill                     $ 6,000,000    
Delaware [Member] | Wastewater Utility System [Member]                          
Business Acquisition [Line Items]                          
Number of customers | customer               16,000          
Retail customers | customer               165,000          
Municipalities | item               42          
Total purchase price               $ 276,500,000