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Multiemployer Pension Plans (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
stores
agreements
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2012
agreements
May 31, 2011
agreements
Multiemployer Plans [Line Items]          
Number of stores | stores 260        
Contributions of AutoNation [1] $ 1.5 $ 1.4 $ 1.1    
Automotive Industries Pension Plan [Member]          
Multiemployer Plans [Line Items]          
EIN 941133245        
Multiemployer plan number 001        
Pension protection act zone status Red Red      
Contributions of AutoNation [1] $ 1.1 $ 1.0 0.8    
Surcharge imposed Yes        
Number of collective-bargaining arrangements that require contributions to the Plan | agreements 2        
Number of collective-bargaining arrangements expired, but currently extended | agreements       1 1
Other funds [Member]          
Multiemployer Plans [Line Items]          
Contributions of AutoNation [1] $ 0.4 $ 0.4 $ 0.3    
Multiemployer Plans, Pension [Member]          
Multiemployer Plans [Line Items]          
Number of stores | stores 5        
[1] Our stores were not listed in the Automotive Industries Pension Plan’s Form 5500 as providing more than 5% of the total contributions for the plan years ended December 31, 2015 or 2014.