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Subsequent Events (Details)
customer in Millions, $ in Millions
Jul. 24, 2020
USD ($)
state
customer
Jul. 22, 2020
USD ($)
Jun. 30, 2020
USD ($)
Leased Assets, Powerton facility and Units 7 and 8 of the Joliet facility      
Subsequent Event [Line Items]      
Operating lease liabilities     $ 148.0
Subsequent Event | Powerton Facility And Units 7 And 8 Of The Joliet Facility      
Subsequent Event [Line Items]      
Payment for asset acquisition   $ 260.0  
Subsequent Event | Direct Energy      
Subsequent Event [Line Items]      
Customers added (over) | customer 3    
Cash paid to acquire business $ 3,600.0    
Proceeds from issuance of long-term debt 2,400.0    
Proceeds from issuance or sale of equity 750.0    
Line of Credit Facility, Increase (Decrease), Net 3,500.0    
Termination fee due from acquiree for failure to obtain shareholder approval 30.0    
Termination fee if Purchase Agreement terminated $ 180.0    
Subsequent Event | Direct Energy | U.S.      
Subsequent Event [Line Items]      
States in which entity operates | state 50    
Subsequent Event | Direct Energy | Canada      
Subsequent Event [Line Items]      
Provinces in which entity operates | state 6