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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 | Mar. 31, 2015 | Sep. 30, 2014 | Mar. 31, 2014
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Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | $ 252.6 us-gaap_RegulatoryAssets | [1] | $ 268.2 us-gaap_RegulatoryAssets | [1] | $ 235.9 us-gaap_RegulatoryAssets | [1]
Regulatory liabilities | 72.6 us-gaap_RegulatoryLiabilities | [1] | 32.5 us-gaap_RegulatoryLiabilities | [1] | 33.1 us-gaap_RegulatoryLiabilities | [1]
Postretirement Benefits |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory liabilities | 19.3 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_PostretirementBenefitCostsMember | [1] | 18.6 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_PostretirementBenefitCostsMember | [1] | 17.2 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_PostretirementBenefitCostsMember | [1]
Environmental Overcollections |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory liabilities | 0 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_EnvironmentalOvercollectionsMember | [1] | 0.3 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_EnvironmentalOvercollectionsMember | [1] | 1.9 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_EnvironmentalOvercollectionsMember | [1]
Deferred Fuel and Power Refunds |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory liabilities | 40.6 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_DeferredFuelAndPowerRefundsMember | [1] | 0.3 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_DeferredFuelAndPowerRefundsMember | [1] | 3.2 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ugi_DeferredFuelAndPowerRefundsMember | [1]
State Tax Benefits—Distribution System Repairs |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory liabilities | 10.6 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember | [1] | 10.1 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember | [1] | 9.0 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember | [1]
Other |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory liabilities | 2.1 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_OtherLiabilitiesMember | [1] | 3.2 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_OtherLiabilitiesMember | [1] | 1.8 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_OtherLiabilitiesMember | [1]
Income Taxes Recoverable |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | 111.5 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_IncomeTaxesRecoverableMember | [1] | 110.7 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_IncomeTaxesRecoverableMember | [1] | 106.8 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_IncomeTaxesRecoverableMember | [1]
Underfunded Pension and Postretirement Plans |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | 105.5 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember | [1] | 110.1 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember | [1] | 91.0 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember | [1]
Environmental Costs |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | 14.1 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember | [1] | 14.6 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember | [1] | 14.5 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember | [1]
Deferred Fuel and Power Costs |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | 0 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredFuelCostsMember | [1] | 11.8 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredFuelCostsMember | [1] | 4.3 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredFuelCostsMember | [1]
Removal Costs, Net |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | 18.4 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_RemovalCostsNetMember | [1] | 16.8 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_RemovalCostsNetMember | [1] | 14.4 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_RemovalCostsNetMember | [1]
Other |  |  |  |  |  |
Regulatory Assets And Liabilities |  |  |  |  |  |
Regulatory assets | $ 3.1 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_OtherRegulatoryAssetsMember | [1] | $ 4.2 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ugi_OtherRegulatoryAssetsMember | [1] | $ 4.9 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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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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