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Inventories (Details) - UGI Utilities
$ in Millions
 3 Months Ended
Dec. 31, 2015
USD ($)
storage_agreement
Bcf
Sep. 30, 2015
USD ($)
Bcf
Dec. 31, 2014
USD ($)
Bcf
Inventory      
SCAA contract term (in years) 3 years    
Storage Contract Administrative Agreements      
Inventory      
Number of storage agreements | storage_agreement 2    
Volume of gas storage inventories released under SCAAs with non-affiliates (in cubic feet) | Bcf 3.8 4.0 3.4
Carrying value of gas storage inventories released under SCAAs with non-affiliates | $ $ 9.4 $ 9.8 $ 14.4