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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenues $ 5,349.2 $ 5,432.4 $ 16,001.1 $ 15,851.1
Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 4,681.6   14,014.0  
Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [1] 667.6   1,987.1  
New Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 2,933.1 3,108.4 8,685.0 8,835.5
Used Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,281.7 1,228.3 3,910.9 3,670.3
Parts and Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 864.0 841.6 2,579.6 2,544.2
Finance and Insurance, Net [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 247.4 241.6 736.0 692.0
Product and Service, Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 23.0 12.5 89.6 109.1
AN Reportable Segment, Domestic [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,789.7 1,912.4 5,389.5 5,557.7
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,613.5   4,870.0  
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [1] 176.2   519.5  
AN Reportable Segment, Domestic [Member] | New Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 988.5   2,913.7  
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 424.4   1,334.4  
AN Reportable Segment, Domestic [Member] | Parts and Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 271.6   810.8  
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 88.6   263.2  
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 16.6   67.4  
AN Reportable Segment, Import [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,770.6 1,789.7 5,140.2 5,123.5
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,591.6   4,603.3  
AN Reportable Segment, Import [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [1] 179.0   536.9  
AN Reportable Segment, Import [Member] | New Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,070.3   3,045.0  
AN Reportable Segment, Import [Member] | Used Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 365.3   1,092.3  
AN Reportable Segment, Import [Member] | Parts and Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 235.8   707.1  
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 94.4   275.8  
AN Reportable Segment, Import [Member] | Product and Service, Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 4.8   20.0  
AN Reportable Segment, Premium Luxury [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,668.8 $ 1,634.3 5,116.8 $ 4,894.9
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,441.5   4,440.5  
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [1] 227.3   676.3  
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 874.3   2,726.3  
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 463.6   1,405.9  
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 269.4   804.1  
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 60.0   178.6  
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1.5   1.9  
Corporate and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] 120.1   354.6  
Corporate and Other [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] 35.0   100.2  
Corporate and Other [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [1],[2] 85.1   254.4  
Corporate and Other [Member] | New Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] 0.0   0.0  
Corporate and Other [Member] | Used Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] 28.4   78.3  
Corporate and Other [Member] | Parts and Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] 87.2   257.6  
Corporate and Other [Member] | Finance and Insurance, Net [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] 4.4   18.4  
Corporate and Other [Member] | Product and Service, Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] $ 0.1   $ 0.3  
[1] Represents revenue recognized during the period for automotive repair and maintenance services.
[2] ?Corporate and other? is comprised of our other businesses, including collision centers, AutoNation USA stand-alone used vehicle sales and service centers, and automotive auctions.