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Acquisitions (Preliminary Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 16, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 2,351,526   $ 63,822
Peoples Gas Acquisition [Member]      
Business Acquisition [Line Items]      
Property, plant and equipment, net   $ 2,468,946  
Current assets   241,372  
Regulatory assets   288,665  
Contributions in aid of construction   82,528  
Goodwill   2,287,677  
Other long-term assets   82,528  
Total assets acquired   5,369,188  
Current portion of long-term debt   5,136  
Loans payable   181,000  
Other current liabilities   182,622  
Long-term debt   999,460  
Deferred income taxes   245,701  
Regulatory liabilities   134,875  
Other long-term liabilities   155,050  
Total liabilities assumed   1,903,844  
Net assets acquired   $ 3,465,344