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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 14, 2024
Jun. 30, 2023
Document And Entity Information [Abstract]      
Document Annual Report true    
Document Type 10-K    
Document Period End Date Dec. 31, 2023    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
Document Transition Report false    
Entity Central Index Key 0000350698    
Entity File Number 1-13107    
Entity Registrant Name AUTONATION, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 73-1105145    
Entity Address, Address Line One 200 SW 1st Ave    
Entity Address, City or Town Fort Lauderdale    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33301    
Amendment Flag false    
City Area Code (954)    
Local Phone Number 769-6000    
Title of 12(b) Security Common Stock, Par Value $0.01 Per Share    
Trading Symbol AN    
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     $ 4.7
Entity Common Stock, Shares Outstanding   41,660,637  
Documents Incorporated by Reference
Portions of the registrant’s Proxy Statement relating to its 2024 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the fiscal year ended December 31, 2023, are incorporated herein by reference in Part III.
    
Auditor Name KPMG LLP    
Auditor Location Fort Lauderdale, FL    
Auditor Firm ID 185    
Document Financial Statement Error Correction [Flag] false