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Commitments and Contingent Liabilities (Details) $ in Millions	Sep. 30, 2020 USD ($)
Loss Contingencies
Letters of credit outstanding	$ 49.0
Surety bonds posted	$ 21.8

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