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Derivative Instruments and Hedging Activities (Details) In Millions, unless otherwise specified | 3 Months Ended |  |  |  |  |  |  |  | 3 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |  |  |  |  | 3 Months Ended |  |  | 3 Months Ended |  |  |  |
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Dec. 31, 2014 USD ($) gal | Dec. 31, 2013 USD ($) gal | Sep. 30, 2014 USD ($) | Dec. 31, 2014 Brokerage Accounts USD ($) | Dec. 31, 2013 Brokerage Accounts USD ($) | Dec. 31, 2014 Interest Rate Swaps EUR (€) | Dec. 31, 2013 Interest Rate Swaps EUR (€) | Dec. 31, 2014 Interest Rate Protection Agreements USD ($) | Dec. 31, 2013 Interest Rate Protection Agreements USD ($) | Dec. 31, 2014 Foreign Currency USD ($) | Dec. 31, 2013 Foreign Currency USD ($) | Dec. 31, 2014 Cross Currency Contracts USD ($) | Dec. 31, 2014 Gas Utility DTH | Dec. 31, 2013 Gas Utility DTH | Dec. 31, 2014 Electric Utility kWh | Dec. 31, 2013 Electric Utility kWh | Dec. 31, 2014 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Purchase Contracts kWh | Dec. 31, 2013 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Purchase Contracts kWh | Dec. 31, 2014 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Sales Contracts kWh | Dec. 31, 2013 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Sales Contracts kWh | Dec. 31, 2014 Midstream & Marketing Propane Storage (millions of dekatherms) Forward Sales Contracts gal | Dec. 31, 2013 Midstream & Marketing Propane Storage (millions of dekatherms) Forward Sales Contracts gal | Dec. 31, 2014 Midstream & Marketing Gas Utility Natural Gas Forward Purchase Contracts DTH | Dec. 31, 2013 Midstream & Marketing Gas Utility Natural Gas Forward Purchase Contracts DTH | Dec. 31, 2014 Midstream & Marketing Natural Gas | Dec. 31, 2014 Midstream & Marketing Natural Gas Storage Forward Sales Contracts DTH | Dec. 31, 2013 Midstream & Marketing Natural Gas Storage Forward Sales Contracts DTH | Dec. 31, 2014 Midstream & Marketing FTR and NYISO Contracts | Dec. 31, 2014 Midstream & Marketing FTR and NYISO Contracts Electric transmission congestion (excluding Electric Utility) kWh | Dec. 31, 2013 Midstream & Marketing FTR and NYISO Contracts Electric transmission congestion (excluding Electric Utility) kWh | Dec. 31, 2014 Net Investment Hedging EUR (€) | Dec. 31, 2013 Net Investment Hedging EUR (€)
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of LPG commodity derivatives (in gallons) | 429,600,000 us-gaap_DerivativeNonmonetaryNotionalAmountVolume | 215,200,000 us-gaap_DerivativeNonmonetaryNotionalAmountVolume |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum length of time hedging exposure to LPG commodity price risk | 33 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding derivative commodity instruments volumes |  |  |  |  |  |  |  |  |  |  |  |  | 11,200,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_StatementBusinessSegmentsAxis = ugi_GasUtilityMember | 9,700,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_StatementBusinessSegmentsAxis = ugi_GasUtilityMember | 486,200,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_StatementBusinessSegmentsAxis = ugi_ElectricUtilityMember | 324,400,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_StatementBusinessSegmentsAxis = ugi_ElectricUtilityMember | 350,000,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_ElectricityMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 664,700,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_ElectricityMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 184,100,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_ElectricityMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 371,000,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_ElectricityMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 2,600,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_PropaneStorageMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 2,200,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_PropaneStorageMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 70,000,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_GasUtilityNaturalGasMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 27,400,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_GasUtilityNaturalGasMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember |  | 600,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_NaturalGasStorageMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 1,100,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_NaturalGasStorageMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember |  | 331,800,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_ElectricTransmissionCongestionExcludingElectricUtilityMember / us-gaap_DerivativeInstrumentRiskAxis = ugi_FTRandNYISOContractsMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 1,085,900,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = ugi_ElectricTransmissionCongestionExcludingElectricUtilityMember / us-gaap_DerivativeInstrumentRiskAxis = ugi_FTRandNYISOContractsMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember |  |
Maximum length of time hedged in price risk cash flow hedges |  |  |  |  |  |  |  |  |  | 36 months |  |  | 9 months |  | 17 months |  | 24 months |  | 9 months |  |  |  |  |  | 41 months |  |  | 5 months |  |  |  |
Notional amount |  |  |  |  |  | € 401.1 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_InterestRateSwapsMember | € 439.8 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_InterestRateSwapsMember | $ 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_InterestRateProtectionAgreementsMember | $ 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_InterestRateProtectionAgreementsMember | $ 225.8 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_ForeignCurrencyMember | $ 149.1 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_ForeignCurrencyMember | $ 52.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CrossCurrencyInterestRateContractMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_NetInvestmentHedgingMember | € 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_NetInvestmentHedgingMember
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months | 2.7 us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months | 8.7 us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 54.6 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | $ 4.5 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | $ 16.6 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | $ 54.6 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_DerivativeByNatureAxis = ugi_BrokerageAccountsMember | $ 3.2 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_DerivativeByNatureAxis = ugi_BrokerageAccountsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Maximum length of time hedged in price risk cash flow hedges. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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