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Debt - Schedule of Short-term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Short-term Debt    
Short-term debt $ 291.7 $ 189.9
AmeriGas Propane Credit Agreement    
Short-term Debt    
Short-term debt 153.2 68.1
UGI International Credit Agreement    
Short-term Debt    
Short-term debt 0.5 0.6
2015 UGI Utilities Credit Agreement    
Short-term Debt    
Short-term debt 112.5 71.7
Midstream and Marketing    
Short-term Debt    
Short-term debt 0.0 30.0
Energy Services Receivables Facility    
Short-term Debt    
Short-term debt $ 25.5 $ 19.5