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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Revenues $ 4,981.8 $ 5,259.9
Transferred at Point in Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 4,312.8 4,601.1
Transferred over Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues [1] 669.0 658.8
New Vehicle [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 2,496.7 2,802.3
Used Vehicle [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 1,339.6 1,330.5
Parts and Service [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 876.7 858.5
Finance and Insurance, Net [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 236.5 240.8
Product and Service, Other [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 32.3 27.8
AN Reportable Segment, Domestic [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 1,568.8 1,773.7
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 1,398.1 1,602.8
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues [1] 170.7 170.9
AN Reportable Segment, Domestic [Member] | New Vehicle [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 781.0 933.6
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 443.4 462.8
AN Reportable Segment, Domestic [Member] | Parts and Service [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 236.3 270.5
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 80.4 85.8
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 27.7 21.0
AN Reportable Segment, Import [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 1,496.1 1,652.6
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 1,324.8 1,475.2
AN Reportable Segment, Import [Member] | Transferred over Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues [1] 171.3 177.4
AN Reportable Segment, Import [Member] | New Vehicle [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 820.2 955.8
AN Reportable Segment, Import [Member] | Used Vehicle [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 369.5 366.8
AN Reportable Segment, Import [Member] | Parts and Service [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 220.2 234.3
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 84.5 89.3
AN Reportable Segment, Import [Member] | Product and Service, Other [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 1.7 6.4
AN Reportable Segment, Premium Luxury [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 1,734.1 1,717.8
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 1,497.2 1,492.2
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues [1] 236.9 225.6
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 895.5 912.9
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 496.7 478.0
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 278.2 268.6
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 61.6 58.0
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 2.1 0.3
Corporate and Other [Member]    
Disaggregation of Revenue [Line Items]    
Revenues [2] 182.8 115.8
Corporate and Other [Member] | Transferred at Point in Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues [2] 92.7 30.9
Corporate and Other [Member] | Transferred over Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues [1],[2] 90.1 84.9
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] 30.0 22.9
Corporate and Other [Member] | Parts and Service [Member]    
Disaggregation of Revenue [Line Items]    
Revenues [2] 142.0 85.1
Corporate and Other [Member] | Finance and Insurance, Net [Member]    
Disaggregation of Revenue [Line Items]    
Revenues [2] 10.0 7.7
Corporate and Other [Member] | Product and Service, Other [Member]    
Disaggregation of Revenue [Line Items]    
Revenues [2] $ 0.8 $ 0.1
[1] Represents revenue recognized during the period for automotive repair and maintenance services. VCP contract term5 years Less Than 1 Year1 - 3 Years3 - 5 Years 122
[2] Corporate and other is comprised of our other businesses, including collision centers, auction operations, AutoNation USA stand-alone used vehicle sales and service centers, and parts distribution centers.