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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($)
Aug. 03, 2020
Jan. 28, 2020
Oct. 11, 2019
Jan. 28, 2019
Oct. 27, 2018
Oct. 25, 2018
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Pennsylvania Public Utility Commission | UGI Gas                  
Regulatory Assets                  
Public utilities, requested rate increase (decrease), amount   $ 74,600,000   $ 71,100,000          
Public utilities, approved rate increase (decrease), amount     $ 30,000,000.0            
Tax benefit to be returned     5 years            
Energy Efficiency and Conservation and Growth extension tariff, extension term       $ 24,000,000.0          
Pennsylvania Public Utility Commission | UGI Gas | Subsequent Event                  
Regulatory Assets                  
Public utilities, requested rate increase (decrease), amount $ 20,000,000.0                
Property, plant and equipment, net threshold $ 2,875,000,000.0                
Amortization period 10 years                
Pennsylvania Public Utility Commission | UGI Gas | Subsequent Event | Beginning January 1, 2021                  
Regulatory Assets                  
Public utilities, requested rate increase (decrease), amount $ 10,000,000.0                
Pennsylvania Public Utility Commission | UGI Gas | Subsequent Event | Beginning July 1, 2021                  
Regulatory Assets                  
Public utilities, requested rate increase (decrease), amount $ 10,000,000.0                
Pennsylvania Public Utility Commission | Electric Utility                  
Regulatory Assets                  
Public utilities, requested rate increase (decrease), amount           $ 3,200,000      
Public utilities, customer billing credit         $ 200,000        
Gas Utility                  
Regulatory Assets                  
Fair value of unrealized gains (losses)             $ 1,000,000.0 $ (2,200,000) $ (2,100,000)