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Inventories - Components of Inventories (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Inventory      
Inventory, net $ 391.0us-gaap_InventoryNet $ 423.0us-gaap_InventoryNet $ 412.4us-gaap_InventoryNet
Non-utility LPG and Natural Gas      
Inventory      
Inventory, net 260.4us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_NonUtilityLpgAndNaturalGasMember		 283.6us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_NonUtilityLpgAndNaturalGasMember		 282.9us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_NonUtilityLpgAndNaturalGasMember
Gas Utility Natural Gas      
Inventory      
Inventory, net 72.4us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_GasUtilityNaturalGasMember		 82.7us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_GasUtilityNaturalGasMember		 69.1us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_GasUtilityNaturalGasMember
Materials, Supplies and Other      
Inventory      
Inventory, net $ 58.2us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_MaterialsSuppliesAndOtherMember		 $ 56.7us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_MaterialsSuppliesAndOtherMember		 $ 60.4us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_MaterialsSuppliesAndOtherMember