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Income Taxes (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Operating loss carryforwards    
Valuation allowance against deferred tax assets related to buildings $ 18.2us-gaap_DeferredTaxAssetsValuationAllowance $ 14.6us-gaap_DeferredTaxAssetsValuationAllowance
UK    
Operating loss carryforwards    
Amount of tax credit carryforwards not subject to expiration 5.2us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= country_GB		  
Net operating loss carryforwards not subject to expiration 0.2pag_OperatingLossCarryForwardsNotSubjectToExpiration
/ us-gaap_StatementGeographicalAxis
= country_GB		  
Valuation allowance against deferred tax assets related to buildings 8.2us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= country_GB		  
German    
Operating loss carryforwards    
Net operating loss carryforwards not subject to expiration 18.2pag_OperatingLossCarryForwardsNotSubjectToExpiration
/ us-gaap_StatementGeographicalAxis
= country_DE		  
Valuation allowance against net operating loss carryforwards 7.3us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= country_DE		  
Australia    
Operating loss carryforwards    
Net operating loss carryforwards not subject to expiration 9.5pag_OperatingLossCarryForwardsNotSubjectToExpiration
/ us-gaap_StatementGeographicalAxis
= country_AU		  
Italian    
Operating loss carryforwards    
Net operating loss carryforwards not subject to expiration 0.1pag_OperatingLossCarryForwardsNotSubjectToExpiration
/ us-gaap_StatementGeographicalAxis
= country_IT		  
State    
Operating loss carryforwards    
Net operating loss carryforwards that expire at various dates 96.9pag_OperatingLossCarryForwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Net operating loss carryforwards utilized 53.1pag_UtilizationOfNetOperatingLossCarryforward
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Valuation allowance against net operating loss carryforwards 2.6us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Valuation allowance against state credit carryforwards 0.1us-gaap_TaxCreditCarryforwardValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Federal and state    
Operating loss carryforwards    
Amount of tax credit carryforwards not subject to expiration $ 3.4us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= pag_FederalAndLocalJurisdictionMember