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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Statement of Cash Flows [Abstract] |  |
Repayment of sellers' floor plan notes payable dealership acquisitions | $ 16.5 | $ 0.0

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- Definition Repayment of sellers' floor plan notes payable, dealership acquisitions. + References No definition available. + Details
Name: | pag_RepaymentOfSellersFloorPlanNotesPayableDealershipAcquisitions
Namespace Prefix: | pag_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration