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Commitments and Contingent Liabilities (Details) $ in Millions | Sep. 30, 2019 USD ($)
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Loss Contingencies |
Letters of credit outstanding | $ 42.2
Surety bonds posted | $ 20.5

X
- Definition Surety bonds posted. + References No definition available. + Details
Name: | pag_SuretyBondsPosted
Namespace Prefix: | pag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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