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Derivatives and Hedging (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Interest Rate Swap Agreements |  |
Derivative |  |
Hedge ineffectiveness recorded | $ 0 us-gaap_GainOnFairValueHedgeIneffectiveness / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember | $ 0 us-gaap_GainOnFairValueHedgeIneffectiveness / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember
Interest Rate Swap Agreements | Level 2 |  |
Derivative |  |
Estimated liabilities of swaps designated as hedging instruments, fair value | 0 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 7.7 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Interest Rate Swap Agreements | Floating Rate Floor Plan Debt |  |
Derivative |  |
Increase in the weighted average interest rate on floor plan borrowings due to the swaps (as a percent) | 0.30%pag_InterestRateImpactFromSwaps / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_ShortTermDebtTypeAxis = pag_FloatingRateFloorPlanDebtMember |
Interest Rate Swap Agreements | Floating Rate Floor Plan Debt | LIBOR portion |  |
Derivative |  |
Portion of floating rate floor plan debt fixed by swap agreements | 300.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_ShortTermDebtTypeAxis = pag_FloatingRateFloorPlanDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Interest rate swap, fixed (as a percent) | 2.135%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_ShortTermDebtTypeAxis = pag_FloatingRateFloorPlanDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Interest Rate Swap Agreements | Floating Rate Floor Plan Debt | Fixed rate portion |  |
Derivative |  |
Portion of floating rate floor plan debt fixed by swap agreements | 100.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_ShortTermDebtTypeAxis = pag_FloatingRateFloorPlanDebtMember / us-gaap_VariableRateAxis = pag_DebtInstrumentFixedRateMember |
Interest rate swap, fixed (as a percent) | 1.55%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_ShortTermDebtTypeAxis = pag_FloatingRateFloorPlanDebtMember / us-gaap_VariableRateAxis = pag_DebtInstrumentFixedRateMember |
Forward foreign exchange contracts | Level 2 |  |
Derivative |  |
Estimated asset of contracts designated as hedging instruments, fair value | $ 1.1 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | $ 2.2 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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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 Represents the impact on the weighted average interest rate from interest rate swaps for the period. + References No definition available. + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Details
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- Definition Amount of gain recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Details
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- Details
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Period Type: |