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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
CONSOLIDATED STATEMENTS OF CASH FLOWS |  |
Repayment of Sellers' Floor Plan Notes Payable Dealership Acquisitions | $ 24.3 | $ 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