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Regulatory Matters - Pennsylvania and West Virginia (Details)
$ in Millions
1 Months Ended 9 Months Ended
Aug. 28, 2020
USD ($)
Mar. 12, 2020
Mar. 11, 2020
Aug. 30, 2019
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2020
USD ($)
proposal
Oct. 13, 2020
Jun. 18, 2020
Dec. 31, 2019
USD ($)
ATSI | FERC                  
Regulatory Matters [Line Items]                  
Regulatory assets           $ 76.0     $ 73.0
Pennsylvania | DSP June 2019- May 2023                  
Regulatory Matters [Line Items]                  
Number of RFP's | proposal           2      
RFP term           2 years      
Pennsylvania | Three Month Period | DSP June 2019- May 2023                  
Regulatory Matters [Line Items]                  
Term of energy contract           3 months      
Pennsylvania | Twelve month period | DSP June 2019- May 2023                  
Regulatory Matters [Line Items]                  
Term of energy contract           12 months      
Pennsylvania | Twenty-four month period | DSP June 2019- May 2023                  
Regulatory Matters [Line Items]                  
Term of energy contract           24 months      
Pennsylvania | Pennsylvania Companies | PPUC | Subsequent Event                  
Regulatory Matters [Line Items]                  
Percent of federal poverty income level             300.00%    
Pennsylvania | Pennsylvania Companies | PPUC | EE&C Phase III                  
Regulatory Matters [Line Items]                  
Approved amount of annual increase         $ 390.0        
Pennsylvania | Pennsylvania Companies | PPUC | New LTIIPs                  
Regulatory Matters [Line Items]                  
Amount of requested rate increase (decrease)       $ 572.0          
Recovery period       5 years          
Pennsylvania | Pennsylvania Companies | PPUC | Wavier of DSIC Cap                  
Regulatory Matters [Line Items]                  
Amount of requested rate increase (decrease) (percent)       11.81%          
Approved ROE     5.00%            
Temporary increase in rate cap   7.50%              
Pennsylvania | ME | PPUC | EE&C Phase IV                  
Regulatory Matters [Line Items]                  
Demand reduction targets               2.90%  
Energy consumption reduction targets               3.10%  
Pennsylvania | PN | PPUC | EE&C Phase IV                  
Regulatory Matters [Line Items]                  
Demand reduction targets               3.30%  
Energy consumption reduction targets               3.00%  
Pennsylvania | Penn | PPUC | EE&C Phase IV                  
Regulatory Matters [Line Items]                  
Demand reduction targets               2.00%  
Energy consumption reduction targets               2.70%  
Pennsylvania | WP | PPUC | EE&C Phase IV                  
Regulatory Matters [Line Items]                  
Demand reduction targets               2.50%  
Energy consumption reduction targets               2.40%  
West Virginia | MP and PE | WVPSC | ENEC                  
Regulatory Matters [Line Items]                  
Amount of requested rate increase (decrease) $ (55.0)                
Amount of requested rate increase (decrease) (percent) (4.10%)                
Recovery of deferred, incremental uncollectible and other related costs $ 10.5                
West Virginia | MP and PE | WVPSC | Modernization and Improvement Program For Coal-Fired Boilers                  
Regulatory Matters [Line Items]                  
Amount of requested rate increase (decrease) $ 5.0