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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 17, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-12297    
Entity Registrant Name Penske Automotive Group, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 22-3086739    
Entity Address, Address Line One 2555 Telegraph Road    
Entity Address, City or Town Bloomfield Hills    
Entity Address, State or Province MI    
Entity Address, Postal Zip Code 48302-0954    
City Area Code 248    
Local Phone Number 648-2500    
Title of 12(b) Security Voting Common Stock, par value $0.0001 per share    
Trading Symbol PAG    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 2,367,008,502
Entity Common Stock, Shares Outstanding   77,327,559  
Documents Incorporated by Reference
Documents Incorporated by Reference
Certain portions, as expressly described in this report, of the registrant’s proxy statement for the 2022 Annual Meeting of the Stockholders to be held May 12, 2022, are incorporated by reference into Part III, Items 10-14.
    
Entity Central Index Key 0001019849    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY