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Inventories - Components of Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Mar. 31, 2014
Inventory      
Inventory, net $ 201.5us-gaap_InventoryNet $ 423.0us-gaap_InventoryNet $ 324.4us-gaap_InventoryNet
Non-utility LPG and Natural Gas      
Inventory      
Inventory, net 135.8us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_NonUtilityLpgAndNaturalGasMember		 283.6us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_NonUtilityLpgAndNaturalGasMember		 251.4us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_NonUtilityLpgAndNaturalGasMember
Gas Utility Natural Gas      
Inventory      
Inventory, net 6.3us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_GasUtilityNaturalGasMember		 82.7us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_GasUtilityNaturalGasMember		 7.5us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_GasUtilityNaturalGasMember
Materials, Supplies and Other      
Inventory      
Inventory, net $ 59.4us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_MaterialsSuppliesAndOtherMember		 $ 56.7us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_MaterialsSuppliesAndOtherMember		 $ 65.5us-gaap_InventoryNet
/ us-gaap_PublicUtilitiesInventoryAxis
= ugi_MaterialsSuppliesAndOtherMember