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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Apr. 20, 2017
Jan. 19, 2017
Oct. 14, 2016
Apr. 01, 2016
Apr. 01, 2015
Mar. 31, 2016
Mar. 31, 2017
Sep. 30, 2014
Sep. 30, 2016
Pennsylvania Public Utility Commission                  
Regulatory Assets                  
Review process period   9 months              
UGI Utilities | Pennsylvania Public Utility Commission                  
Regulatory Assets                  
Requested operating revenue increase   $ 21.7              
Operating revenue increase     $ 27.0            
Maximum period since petition to file a general rate filing             5 years    
DSIC, percent of amount billed to customers               0.00%  
UGI Utilities | Pennsylvania Public Utility Commission | PNG                  
Regulatory Assets                  
DSIC, percent of amount billed to customers         0.00%        
UGI Utilities | Pennsylvania Public Utility Commission | PNG | Subsequent Event                  
Regulatory Assets                  
DSIC, percent of amount billed to customers 7.50%                
UGI Utilities | Pennsylvania Public Utility Commission | CPG                  
Regulatory Assets                  
DSIC, percent of amount billed to customers       0.00%          
UGI Utilities | Pennsylvania Public Utility Commission | CPG | Subsequent Event                  
Regulatory Assets                  
DSIC, percent of amount billed to customers 7.50%                
UGI Utilities | Pennsylvania Public Utility Commission | Maximum                  
Regulatory Assets                  
DSIC, percent of amount billed to customers           5.00% 5.00%    
UGI Utilities | Pennsylvania Public Utility Commission | Maximum | PNG                  
Regulatory Assets                  
DSIC, percent of amount billed to customers           10.00%      
UGI Utilities | Pennsylvania Public Utility Commission | Maximum | CPG                  
Regulatory Assets                  
DSIC, percent of amount billed to customers           10.00%      
Gas Utility                  
Regulatory Assets                  
Fair value of unrealized gains (losses)           $ (1.9) $ 2.0   $ 4.3