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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($)
$ in Millions
Jan. 28, 2020
Oct. 11, 2019
Jan. 28, 2019
Oct. 27, 2018
Oct. 25, 2018
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Pennsylvania Public Utility Commission | UGI Gas                
Regulatory Assets                
Public utilities, requested rate increase (decrease), amount $ 74.6   $ 71.1          
Public utilities, approved rate increase (decrease), amount   $ 30.0            
Tax benefit to be returned     $ 24.0          
Energy Efficiency and Conservation and Growth extension tariff, extension term   5 years            
Pennsylvania Public Utility Commission | Electric Utility                
Regulatory Assets                
Public utilities, requested rate increase (decrease), amount         $ 3.2      
Public utilities, customer billing credit       $ 0.2        
Gas Utility                
Regulatory Assets                
Fair value of unrealized gains (losses)           $ (0.5) $ (2.2) $ 1.0