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Organization and Summary of Significant Accounting Policies (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Significant Accounting Policies      
Interest rate (as a percent)     3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
Contracts in Transit      
Contracts in transit, included in accounts receivable $ 264.8pag_ContractsInTransit $ 250.5pag_ContractsInTransit  
Impairment Testing      
Number of reportable Segments 2us-gaap_NumberOfReportableSegments    
Number of geographical reporting units for the purpose of goodwill impairment testing 4pag_NumberOfGeographicOperatingSegments    
Investments      
Net book value of investments 352.8us-gaap_EquityMethodInvestments 346.9us-gaap_EquityMethodInvestments  
Fair Value of Financial Instruments      
Debt instrument, Carrying Value 1,352.6us-gaap_LongTermDebt 996.3us-gaap_LongTermDebt  
Minimum      
Significant Accounting Policies      
Ownership interest in the voting stock of the affiliate (as a percent) 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Minimum | Property and equipment other than leasehold improvements      
Property and Equipment      
Useful life of property and equipment 3 years    
Maximum      
Significant Accounting Policies      
Ownership interest in the voting stock of the affiliate (as a percent) 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Maximum | Property and equipment other than leasehold improvements      
Property and Equipment      
Useful life of property and equipment 15 years    
Maximum | Leasehold improvements and equipment under capital lease      
Property and Equipment      
Useful life of property and equipment 40 years    
5.75% senior subordinated notes due 2022      
Significant Accounting Policies      
Interest rate (as a percent) 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
Fair Value of Financial Instruments      
Debt instrument, Carrying Value 550.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
550.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
 
5.75% senior subordinated notes due 2022 | Level 2      
Fair Value of Financial Instruments      
Debt instrument, Carrying Value 550.0us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
550.0us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
 
Debt instrument, Fair Value 558.4us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
565.1us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
 
5.75% senior subordinated notes due 2022 | Penske Automotive Group      
Significant Accounting Policies      
Interest rate (as a percent) 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.75PercentDue2022Member
5.375% senior subordinated notes due 2024      
Significant Accounting Policies      
Interest rate (as a percent) 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.375PercentDue2024Member
   
Fair Value of Financial Instruments      
Debt instrument, Carrying Value 300.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.375PercentDue2024Member
   
5.375% senior subordinated notes due 2024 | Level 2      
Fair Value of Financial Instruments      
Debt instrument, Carrying Value 300.0us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.375PercentDue2024Member
   
Debt instrument, Fair Value 306.0us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.375PercentDue2024Member
   
5.375% senior subordinated notes due 2024 | Penske Automotive Group      
Significant Accounting Policies      
Interest rate (as a percent) 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pag_SeniorSubordinatedNotes5.375PercentDue2024Member
   
Mortgage facilities      
Fair Value of Financial Instruments      
Debt instrument, Carrying Value 169.7us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
118.6us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Mortgage facilities | Level 2      
Fair Value of Financial Instruments      
Debt instrument, Carrying Value 169.7us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
118.6us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Debt instrument, Fair Value $ 171.6us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
$ 117.0us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember