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Financing: At-the-Market Equity Offering Program (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
Feb. 27, 2020
Aug. 03, 2020
Aug. 02, 2020
At The Market Equity Offering Program Authorized Aggregate Value   $ 400 $ 300
Private Placement      
Sale of Stock, Number of Shares Issued in Transaction 1.2    
Sale of Stock, Price Per Share $ 81.77    
Sale of Stock, Consideration Received on Transaction $ 99