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Utility Regulatory Assets and Liabilities and Regulatory Matters (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014 | Mar. 31, 2014
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Gas Utility |  |  |
Regulatory Assets |  |  |
Fair value of unrealized gains (losses) | $ (3.4)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_RegulatoryAssetAxis = ugi_GasUtilityMember | $ (1.4)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_RegulatoryAssetAxis = ugi_GasUtilityMember | $ 2.4 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_RegulatoryAssetAxis = ugi_GasUtilityMember
Electric Utility Electric Supply Contracts |  |  |
Regulatory Assets |  |  |
Fair value of unrealized gains (losses) | $ (1.2)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_RegulatoryAssetAxis = ugi_ElectricUtilityElectricSupplyContractsMember | $ 0.3 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_RegulatoryAssetAxis = ugi_ElectricUtilityElectricSupplyContractsMember | $ 0.4 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_RegulatoryAssetAxis = ugi_ElectricUtilityElectricSupplyContractsMember

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