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Regulatory Matters - Ohio (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 09, 2019
Oct. 01, 2019
Jul. 15, 2019
Nov. 09, 2018
Mar. 12, 2018
Oct. 12, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Regulatory Matters [Line Items]                    
Proposed reduction in power plants carbon pollution (percent)             90.00%      
Ohio                    
Regulatory Matters [Line Items]                    
Portfolio plan estimated cost                   $ 268.0
Ohio | PUCO                    
Regulatory Matters [Line Items]                    
Proposed reduction in power plants carbon pollution (percent)           90.00%        
Requested removal of cost cap         4.00%          
Ohio | PUCO | DMR                    
Regulatory Matters [Line Items]                    
Annual revenue cap for rider                 $ 132.5  
Cost recovery period                 3 years  
Approved annual revenue cap for rider               $ 168.0    
Approved amount of rate increase   $ (28.0)                
Ohio | PUCO | DCR Rider                    
Regulatory Matters [Line Items]                    
Revenue cap for Rider for years 3-6           $ 20.0        
Revenue cap for Rider for years 6-8           15.0        
Ohio | PUCO | DPM Plan                    
Regulatory Matters [Line Items]                    
Approved amount of rate increase       $ 516.0            
Grid modernization plan period       3 years            
Ohio | PUCO | Energy Conservation, Economic Development and Job Retention                    
Regulatory Matters [Line Items]                    
Contribution amount           $ 51.0        
Ohio Companies | Ohio | PUCO | Ohio Consumers Counsel DMR Refund                    
Regulatory Matters [Line Items]                    
Amount of damages sought     $ 42.0              
Ohio Companies | Ohio | PUCO | RTEP                    
Regulatory Matters [Line Items]                    
Approved amount of rate increase $ 95.0