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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Gas Utility and Electric Utility (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
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Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | $ 270.6 us-gaap_RegulatoryAssets | [1] | $ 268.2 us-gaap_RegulatoryAssets | [1] | $ 233.9 us-gaap_RegulatoryAssets | [1]
Regulatory liabilities | 32.9 us-gaap_RegulatoryLiabilities | [1] | 32.5 us-gaap_RegulatoryLiabilities | [1] | 36.6 us-gaap_RegulatoryLiabilities | [1]
Postretirement Benefits |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory liabilities | 19.0 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_PostretirementBenefitCostsMember | [1] | 18.6 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_PostretirementBenefitCostsMember | [1] | 16.8 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_PostretirementBenefitCostsMember | [1]
Environmental Overcollections |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory liabilities | 0.2 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_EnvironmentalOvercollectionsMember | [1] | 0.3 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_EnvironmentalOvercollectionsMember | [1] | 2.3 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_EnvironmentalOvercollectionsMember | [1]
Deferred Fuel and Power Refunds |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory liabilities | 0 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_DeferredFuelAndPowerRefundsMember | [1] | 0.3 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_DeferredFuelAndPowerRefundsMember | [1] | 7.5 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_DeferredFuelAndPowerRefundsMember | [1]
State Tax Benefits—Distribution System Repairs |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory liabilities | 10.3 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember | [1] | 10.1 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember | [1] | 8.7 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember | [1]
Other |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory liabilities | 3.4 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_OtherLiabilitiesMember | [1] | 3.2 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_OtherLiabilitiesMember | [1] | 1.3 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_OtherLiabilitiesMember | [1]
Income Taxes Recoverable |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | 111.1 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_IncomeTaxesRecoverableMember | [1] | 110.7 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_IncomeTaxesRecoverableMember | [1] | 106.4 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_IncomeTaxesRecoverableMember | [1]
Underfunded Pension and Postretirement Plans |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | 107.8 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember | [1] | 110.1 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember | [1] | 92.8 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember | [1]
Environmental Costs |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | 14.7 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember | [1] | 14.6 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember | [1] | 14.9 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember | [1]
Deferred Fuel and Power Costs |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | 16.7 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredFuelCostsMember | [1] | 11.8 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredFuelCostsMember | [1] | 0.4 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredFuelCostsMember | [1]
Removal Costs, Net |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | 17.6 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_RemovalCostsNetMember | [1] | 16.8 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_RemovalCostsNetMember | [1] | 13.7 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_RemovalCostsNetMember | [1]
Other |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | $ 2.7 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_OtherRegulatoryAssetsMember | [1] | $ 4.2 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_OtherRegulatoryAssetsMember | [1] | $ 5.7 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_OtherRegulatoryAssetsMember | [1]
[1] | Noncurrent regulatory assets are recorded in other assets and regulatory liabilities are recorded in other current and other noncurrent liabilities in the Condensed Consolidated Balance Sheets.

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