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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Feb. 14, 2020
Document And Entity Information [Abstract]    
Document Annual Report true  
Document Type 10-K  
Document Period End Date Dec. 31, 2019  
Document Fiscal Period Focus FY  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
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  
Entity Shell Company false  
Entity Public Float $ 2.3  
Entity Common Stock, Shares Outstanding   89,474,267
Documents Incorporated by Reference
Portions of the registrant’s Proxy Statement relating to its 2020 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the fiscal year ended December 31, 2019 are incorporated herein by reference in Part III.