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Organization and Summary of Significant Accounting Policies (Details) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 2 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 30, 2013 USD ($) | Jun. 30, 2013 USD ($) | Mar. 31, 2013 USD ($) | Dec. 31, 2014 USD ($) item | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 Bremen, Germany item | Oct. 01, 2014 MTU Detroit Diesel Australia USD ($) | Oct. 01, 2014 MTU Detroit Diesel Australia AUD | Dec. 31, 2014 MTU Detroit Diesel Australia USD ($) | Dec. 31, 2014 Commercial Vehicle Distribution item | Dec. 31, 2014 Commercial Vehicle Distribution Revenues | Dec. 31, 2014 Commercial Vehicle Distribution Gross Profit Member | Dec. 31, 2014 Penske Truck Leasing Co., L.P. | Dec. 31, 2014 Retail Automotive Dealership USD ($) item | Dec. 31, 2014 Retail Commercial Vehicle Dealership USD ($) | Dec. 31, 2014 Retail Commercial Vehicle Dealership USD ($) | Sep. 30, 2014 Retail Commercial Vehicle Dealership | Feb. 28, 2015 Retail Commercial Vehicle Dealership Subsequent event item | Dec. 31, 2014 Commercial Vehicle Distribution And Other Operations USD ($) | Dec. 31, 2014 BMW,MINI item | Dec. 31, 2014 BMW,MINI Revenues | Dec. 31, 2014 Audi/Volkswagen/Porsche/Bentley Revenues | Dec. 31, 2014 Toyota/Lexus/Scion Revenues | Dec. 31, 2014 Mercedes-Benz/Sprinter/smart Revenues
Organization and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 4,410.1 us-gaap_SalesRevenueNet | $ 4,381.4 us-gaap_SalesRevenueNet | $ 4,370.5 us-gaap_SalesRevenueNet | $ 4,015.2 us-gaap_SalesRevenueNet | $ 3,793.3 us-gaap_SalesRevenueNet | $ 3,724.6 us-gaap_SalesRevenueNet | $ 3,599.2 us-gaap_SalesRevenueNet | $ 3,326.8 us-gaap_SalesRevenueNet | $ 17,177.2 us-gaap_SalesRevenueNet | $ 14,443.9 us-gaap_SalesRevenueNet | $ 12,902.6 us-gaap_SalesRevenueNet |  |  |  | $ 52.5 us-gaap_SalesRevenueNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = pag_MtuDetroitDieselAuthorityMember |  |  |  |  | $ 16,600.0 us-gaap_SalesRevenueNet / us-gaap_FranchisorDisclosureAxis = pag_RetailAutomotiveDealershipsMember | $ 125.6 us-gaap_SalesRevenueNet / us-gaap_FranchisorDisclosureAxis = pag_RetailCommercialVehicleDealershipsMember |  |  |  | $ 448.9 us-gaap_SalesRevenueNet / us-gaap_FranchisorDisclosureAxis = pag_CommercialVehicleDistributionAndOtherOperationsMember |  |  |  |  |
Receivables from manufacturers | 169.9 pag_ReceivablesFromManufacturer |  |  |  | 145.8 pag_ReceivablesFromManufacturer |  |  |  | 169.9 pag_ReceivablesFromManufacturer | 145.8 pag_ReceivablesFromManufacturer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of owned and operated franchises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 327 pag_NumberOfOwnedAndOperatedFranchises / us-gaap_FranchisorDisclosureAxis = pag_RetailAutomotiveDealershipsMember |  |  |  |  |  |  |  |  |  |
Number of owned and operated franchises in US |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 179 pag_NumberOfOwnedAndOperatedFranchisesInDomesticCountry / us-gaap_FranchisorDisclosureAxis = pag_RetailAutomotiveDealershipsMember |  |  |  |  |  |  |  |  |  |
Number of owned and operated franchises outside US |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 148 pag_NumberOfOwnedAndOperatedFranchisesInForeignCountries / us-gaap_FranchisorDisclosureAxis = pag_RetailAutomotiveDealershipsMember |  |  |  |  |  |  |  |  |  |
Percentage of total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_BusinessAcquisitionAxis = pag_WesternStarTrucksAustraliaMember / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember | 2.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_BusinessAcquisitionAxis = pag_WesternStarTrucksAustraliaMember / us-gaap_ConcentrationRiskByBenchmarkAxis = pag_GrossProfitMember |  |  |  |  |  |  |  |  | 27.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_FranchisorDisclosureAxis = pag_BmwMiniMember | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_FranchisorDisclosureAxis = pag_AudiVolkswagenPorscheBentleyMember | 15.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_FranchisorDisclosureAxis = pag_ToyotaLexusMember | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_FranchisorDisclosureAxis = pag_MercedesBenzSprinterSmartMaybachMember
Gain on investment |  |  |  |  |  |  |  |  | 16.0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |  |  |  |  |  |  |  |  |  |  |  |  | 16.0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_FranchisorDisclosureAxis = pag_RetailCommercialVehicleDealershipsMember |  |  |  |  |  |  |  |
Number of acquired franchises |  |  |  |  |  |  |  |  | 2 pag_NumberOfFranchisesAcquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of franchises awarded to the reporting entity |  |  |  |  |  |  |  |  | 6 pag_NumberOfFranchisesAwardedToReportingEntity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of franchises disposed of |  |  |  |  |  |  |  |  | 7 pag_NumberOfFranchisesDisposedOf |  |  | 4 pag_NumberOfFranchisesDisposedOf / invest_InvestmentGeographicRegionAxis = pag_BremenGermanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customer | 4,410.1 us-gaap_SalesRevenueNet | 4,381.4 us-gaap_SalesRevenueNet | 4,370.5 us-gaap_SalesRevenueNet | 4,015.2 us-gaap_SalesRevenueNet | 3,793.3 us-gaap_SalesRevenueNet | 3,724.6 us-gaap_SalesRevenueNet | 3,599.2 us-gaap_SalesRevenueNet | 3,326.8 us-gaap_SalesRevenueNet | 17,177.2 us-gaap_SalesRevenueNet | 14,443.9 us-gaap_SalesRevenueNet | 12,902.6 us-gaap_SalesRevenueNet |  |  |  | 52.5 us-gaap_SalesRevenueNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = pag_MtuDetroitDieselAuthorityMember |  |  |  |  | 16,600.0 us-gaap_SalesRevenueNet / us-gaap_FranchisorDisclosureAxis = pag_RetailAutomotiveDealershipsMember | 125.6 us-gaap_SalesRevenueNet / us-gaap_FranchisorDisclosureAxis = pag_RetailCommercialVehicleDealershipsMember |  |  |  | 448.9 us-gaap_SalesRevenueNet / us-gaap_FranchisorDisclosureAxis = pag_CommercialVehicleDistributionAndOtherOperationsMember |  |  |  |  |
Number of operating franchises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 pag_NumberOfOperatingFranchises / us-gaap_FranchisorDisclosureAxis = pag_RetailCommercialVehicleDealershipsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  | 8 pag_NumberOfOperatingFranchises / us-gaap_FranchisorDisclosureAxis = pag_BmwMiniMember |  |  |  |
Minimum number of dealership locations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70 pag_MinimumNumberOfDealershipLocations / us-gaap_BusinessAcquisitionAxis = pag_WesternStarTrucksAustraliaMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  | $ 115.0 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = pag_MtuDetroitDieselAuthorityMember | 131.5 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = pag_MtuDetroitDieselAuthorityMember |  |  |  |  |  |  |  | $ 75.3 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_FranchisorDisclosureAxis = pag_RetailCommercialVehicleDealershipsMember |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 91.00%pag_InvestmentOwnershipPercentage / us-gaap_FranchisorDisclosureAxis = pag_RetailCommercialVehicleDealershipsMember | 91.00%pag_InvestmentOwnershipPercentage / us-gaap_FranchisorDisclosureAxis = pag_RetailCommercialVehicleDealershipsMember |  |  |  | 50.00%pag_InvestmentOwnershipPercentage / us-gaap_FranchisorDisclosureAxis = pag_BmwMiniMember |  |  |  |
Number of full service retail locations operated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 pag_NumberOfFullServiceRetailLocationsOperated / us-gaap_FranchisorDisclosureAxis = pag_RetailCommercialVehicleDealershipsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |
Number of full service retail locations acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 pag_NumberOfFullServiceRetailLocationsAcquired / us-gaap_FranchisorDisclosureAxis = pag_RetailCommercialVehicleDealershipsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |
Number of retail dealerships owned by the reporting entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 pag_NumberOfTruckRetailDealershipsOwnedByReportingEntity / us-gaap_BusinessAcquisitionAxis = pag_WesternStarTrucksAustraliaMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of Equity Method Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_FranchisorDisclosureAxis = pag_RetailCommercialVehicleDealershipsMember |  |  |  |  |  |  |

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- Definition Number of brands represented by franchises awarded to the reporting entity. + References No definition available. + Details
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- Definition Represents the number of full service retail locations acquired. + References No definition available. + Details
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- Definition Number of owned and operated franchises in domestic country. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership. + References No definition available. + Details
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