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Commitments and Contingent Liabilities - Other (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Commitments and Contingent Liabilities |
Letters of credit outstanding | $ 41.4
Surety bonds posted | $ 29.2

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- 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

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- 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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration