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Business Combinations (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 item | Dec. 31, 2013 item
Business Combinations |  |
Revenue from acquisition in 2014 | 351.5 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |
Pre-tax income from acquisition in 2014 | 5.7 pag_BusinessCombinationProFormaInformationPreTaxIncomeOfAcquireeSinceAcquisitionDateActual |
Gain on investment | 16.0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |
Business combinations |  |
Number of acquired franchises | 2 pag_NumberOfFranchisesAcquired |
Automotive retail franchise |  |
Business combinations |  |
Number of acquired franchises | 2 pag_NumberOfFranchisesAcquired / us-gaap_BusinessAcquisitionAxis = pag_AutomotiveRetailFranchisesMember | 9 pag_NumberOfFranchisesAcquired / us-gaap_BusinessAcquisitionAxis = pag_AutomotiveRetailFranchisesMember

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- Definition This element represents the amount of pre-tax income of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References No definition available. + Details
Name: | pag_BusinessCombinationProFormaInformationPreTaxIncomeOfAcquireeSinceAcquisitionDateActual
Namespace Prefix: | pag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of franchises acquired. + References No definition available. + Details
Name: | pag_NumberOfFranchisesAcquired
Namespace Prefix: | pag_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessCombinationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=pag_AutomotiveRetailFranchisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |