Interim Financial Statements [Line Items]

No definition available.

Name:	pag_InterimFinancialStatementsLineItems
Namespace Prefix:	pag_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Businesses Opened

+ References

No definition available.

+ Details

Name:	pag_NumberOfBusinessesOpened
Namespace Prefix:	pag_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of locations closed of by the entity during the period.

+ References

No definition available.

+ Details

Name:	pag_NumberOfLocationsClosed
Namespace Prefix:	pag_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of operating franchises.

+ References

No definition available.

+ Details

Name:	pag_NumberOfOperatingFranchises
Namespace Prefix:	pag_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Total number of owned and operated franchises.

+ References

No definition available.

+ Details

Name:	pag_NumberOfOwnedAndOperatedFranchises
Namespace Prefix:	pag_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of owned and operated franchises in domestic country.

+ References

No definition available.

+ Details

Name:	pag_NumberOfOwnedAndOperatedFranchisesInDomesticCountry
Namespace Prefix:	pag_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of owned and operated franchises in foreign countries.

+ References

No definition available.

+ Details

Name:	pag_NumberOfOwnedAndOperatedFranchisesInForeignCountries
Namespace Prefix:	pag_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of retail locations operated.

+ References

No definition available.

+ Details

Name:	pag_NumberOfRetailLocationsOperated
Namespace Prefix:	pag_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of stand-alone used vehicle supercenters operated in the United States and United Kingdom.

+ References

No definition available.

+ Details

Name:	pag_NumberOfStandAloneUsedVehicleDealershipsOperatedInUnitedStatesAndUnitedKingdom
Namespace Prefix:	pag_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of States With Locations

+ References

No definition available.

+ Details

Name:	pag_NumberOfStatesWithLocations
Namespace Prefix:	pag_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482987/272-10-50-3

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pag_RetailAutomotiveDealershipSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=pag_OutsideUSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=pag_UnitedStatesAndUnitedKingdomMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsegmentsAxis=pag_FranchisedDealershipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FranchisorDisclosureAxis=pag_FordMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FranchisorDisclosureAxis=pag_ChryslerJeepDodgeRamMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsegmentsAxis=pag_CarShopUsedVehicleDealershipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_IT
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_AU
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FranchisorDisclosureAxis=pag_PorscheMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FranchisorDisclosureAxis=pag_DucatiMotorcycleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pag_RetailCommercialTruckDealershipSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=pag_UnitedStatesAndOntarioCanadaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=pag_PenskeTruckLeasingCoLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=pag_PenskeCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=pag_MitsuiAndCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=pag_PenskeTruckLeasingCoLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Interim Financial Statements - Business Overview (Details)	1 Months Ended	3 Months Ended
	Apr. 30, 2024 dealership	Mar. 31, 2024 franchise dealership state location	Mar. 31, 2023 franchise
Interim Financial Statements [Line Items]
Number of franchises acquired			0
Retail automotive dealership
Interim Financial Statements [Line Items]
Total number of owned and operated franchises		360
Retail automotive dealership \| Outside the U.S.
Interim Financial Statements [Line Items]
Number of owned and operated franchises outside US		208
Retail automotive dealership \| U.S. and U.K.
Interim Financial Statements [Line Items]
Number of stand-alone used vehicle dealerships operated in United States and United Kingdom \| dealership		18
Retail automotive dealership \| U.S.
Interim Financial Statements [Line Items]
Number of owned and operated franchises in US		152
Number of retail locations operated \| dealership		6
Retail automotive dealership \| U.S. \| Franchised Dealerships \| Ford
Interim Financial Statements [Line Items]
Number of franchises acquired \| dealership		1
Retail automotive dealership \| U.S. \| Franchised Dealerships \| Chrysler, Jeep, Dodge, Ram
Interim Financial Statements [Line Items]
Number of franchises acquired \| dealership		1
Retail automotive dealership \| U.S. \| CarShop Used Vehicle Dealerships
Interim Financial Statements [Line Items]
Number of locations closed		1
Retail automotive dealership \| U.K.
Interim Financial Statements [Line Items]
Number of retail locations operated \| dealership		12
Retail automotive dealership \| U.K. \| Franchised Dealerships
Interim Financial Statements [Line Items]
Number of franchises acquired		16
Number of franchises opened		1
Retail automotive dealership \| ITALY \| Franchised Dealerships
Interim Financial Statements [Line Items]
Number of franchises acquired		2
Retail automotive dealership \| AUSTRALIA \| Franchised Dealerships \| Porsche \| Subsequent Event
Interim Financial Statements [Line Items]
Number of franchises acquired \| dealership	2
Retail automotive dealership \| AUSTRALIA \| Franchised Dealerships \| Ducati Motorcycle \| Subsequent Event
Interim Financial Statements [Line Items]
Number of franchises acquired \| dealership	1
Retail commercial truck dealership
Interim Financial Statements [Line Items]
Number of operating locations \| location		43
Retail commercial truck dealership \| U.S. and Ontario, Canada
Interim Financial Statements [Line Items]
Number of states with dealerships \| state		9
Penske Truck Leasing Co L P \| Penske Corporation
Interim Financial Statements [Line Items]
Penske transportation solutions, ownership percentage		41.10%
Penske Truck Leasing Co L P \| Mitsui and Co
Interim Financial Statements [Line Items]
Penske transportation solutions, ownership percentage		30.00%
Penske Truck Leasing Co L P
Interim Financial Statements [Line Items]
Penske transportation solutions, ownership percentage		28.90%