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Acquisitions (Preliminary Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 16, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 2,333,535   $ 63,822
Peoples Gas Acquisition [Member]      
Business Acquisition [Line Items]      
Property, plant and equipment, net   $ 2,468,946  
Current assets   242,531  
Regulatory assets   281,940  
Contributions in aid of construction   82,296  
Goodwill   2,269,437  
Other long-term assets   82,296  
Total assets acquired   5,345,150  
Current portion of long-term debt   5,136  
Loans payable   181,000  
Other current liabilities   183,971  
Long-term debt   999,460  
Deferred income taxes   232,160  
Regulatory liabilities   123,029  
Other long-term liabilities   155,050  
Total liabilities assumed   1,879,806  
Net assets acquired   $ 3,465,344