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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenues $ 5,392.0 $ 5,279.3 $ 10,651.9 $ 10,418.7
Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 4,731.3   9,332.4  
Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [1] 660.7   1,319.5  
New Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 2,949.6 2,930.9 5,751.9 5,727.1
Used Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,298.7 1,201.1 2,629.2 2,442.0
Parts and Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 857.1 857.5 1,715.6 1,702.6
Finance and Insurance, Net [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 247.8 228.8 488.6 450.4
Other Goods and Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 38.8 61.0 66.6 96.6
AN Reportable Segment, Domestic [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,826.1 1,844.7 3,599.8 3,645.5
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,653.7   3,256.5  
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [1] 172.4   343.3  
AN Reportable Segment, Domestic [Member] | New Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 991.6   1,925.2  
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 447.2   910.0  
AN Reportable Segment, Domestic [Member] | Parts and Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 268.7   539.2  
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 88.8   174.6  
AN Reportable Segment, Domestic [Member] | Other Goods and Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 29.8   50.8  
AN Reportable Segment, Import [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,717.0 1,702.2 3,369.6 3,333.9
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,536.5   3,011.7  
AN Reportable Segment, Import [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [1] 180.5   357.9  
AN Reportable Segment, Import [Member] | New Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,018.9   1,974.7  
AN Reportable Segment, Import [Member] | Used Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 360.2   727.0  
AN Reportable Segment, Import [Member] | Parts and Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 237.0   471.3  
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 92.1   181.4  
AN Reportable Segment, Import [Member] | Other Goods and Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 8.8   15.2  
AN Reportable Segment, Premium Luxury [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,730.2 $ 1,644.1 3,448.0 $ 3,260.7
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,506.8   2,999.0  
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [1] 223.4   449.0  
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 939.1   1,852.0  
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 464.3   942.3  
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 266.1   534.7  
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 60.6   118.6  
AN Reportable Segment, Premium Luxury [Member] | Other Goods and Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 0.1   0.4  
Corporate and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] 118.7   234.5  
Corporate and Other [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] 34.3   65.2  
Corporate and Other [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [1],[2] 84.4   169.3  
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] 27.0   49.9  
Corporate and Other [Member] | Parts and Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] 85.3   170.4  
Corporate and Other [Member] | Finance and Insurance, Net [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] 6.3   14.0  
Corporate and Other [Member] | Other Goods and Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] $ 0.1   $ 0.2  
[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, automotive auctions, and AutoNation USA stand-alone used vehicle sales and service centers.