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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 21, 2023
Oct. 06, 2023
Sep. 21, 2023
Jul. 31, 2023
Mar. 06, 2023
Jan. 27, 2023
Jan. 01, 2023
Nov. 01, 2022
Sep. 15, 2022
Jul. 29, 2022
Jan. 28, 2022
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Regulatory Assets                            
Net unrealized gains                       $ (141,000) $ (1,402,000)  
Gas Utility                            
Regulatory Assets                            
Net unrealized gains                       $ (11,000) $ (17,000) $ (2,000)
Utilities | PAPUC                            
Regulatory Assets                            
Requested rate increase (decrease)           $ 11,000         $ 83,000      
Approved rate increase (decrease)     $ 9,000                      
Utilities | PAPUC | Joint Petition                            
Regulatory Assets                            
Requested rate increase (decrease)                 $ 49,000          
Property, plant and equipment, net threshold               $ 3,368,000            
Utilities | PAPUC | Beginning October 29, 2022                            
Regulatory Assets                            
Requested rate increase (decrease)                 38,000          
Utilities | PAPUC | Beginning October 1, 2023                            
Regulatory Assets                            
Requested rate increase (decrease)                 $ 11,000          
Utilities | PAPUC | Weather normalization adjustment rider                            
Regulatory Assets                            
Pilot program duration               5 years            
Approved rate               3.00%            
Mountaineer | WVPSC | Weather normalization adjustment rider                            
Regulatory Assets                            
Approved rate 2.00%                          
Adjustment rider period 5 years                          
Weather deviates threshold 2.00%                          
Mountaineer | WVPSC | 2023 IREP Recovery                            
Regulatory Assets                            
Requested rate increase (decrease)       $ 10,000                    
Total capital investments       383,000                    
Mountaineer | WVPSC | 2023 IREP                            
Regulatory Assets                            
Costs associated with capital investments       131,000                    
Mountaineer | WVPSC | 2023 IREP For 2024                            
Regulatory Assets                            
Costs associated with capital investments       $ 67,000                    
Mountaineer | WVPSC | Net Revenue Increase                            
Regulatory Assets                            
Requested rate increase (decrease)   $ 14,000     $ 20,000                  
Mountaineer | WVPSC | Base Rates                            
Regulatory Assets                            
Requested rate increase (decrease)         38,000                  
Mountaineer | WVPSC | IREP rate                            
Regulatory Assets                            
Requested rate increase (decrease)         $ (18,000)                  
Mountaineer | WVPSC | Over 2023 - 2027                            
Regulatory Assets                            
Requested rate increase (decrease)                   $ 354,000        
Mountaineer | WVPSC | Calendar Year 2023                            
Regulatory Assets                            
Requested rate increase (decrease)                   $ 64,000        
Approved rate increase (decrease)             $ 22,000