v3.26.1
Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Revenues $ 6,929.8 $ 6,974.4 $ 13,481.9 $ 13,664.8
Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Revenues 5,938.0 5,989.0 11,518.2 11,741.4
Transferred over Time        
Disaggregation of Revenue [Line Items]        
Revenues [1] 991.8 985.4 1,963.7 1,923.4
New vehicle        
Disaggregation of Revenue [Line Items]        
Revenues 3,292.7 3,396.3 6,303.7 6,644.4
Used vehicle        
Disaggregation of Revenue [Line Items]        
Revenues 2,011.4 1,985.0 3,975.2 3,907.4
Parts and service        
Disaggregation of Revenue [Line Items]        
Revenues 1,263.0 1,221.1 2,483.9 2,385.1
Finance and insurance, net        
Disaggregation of Revenue [Line Items]        
Revenues 357.6 367.7 709.6 720.2
Other        
Disaggregation of Revenue [Line Items]        
Revenues 5.1 4.3 9.5 7.7
AN Reportable Segment, Domestic        
Disaggregation of Revenue [Line Items]        
Revenues 1,793.1 1,920.5 3,509.7 3,637.9
AN Reportable Segment, Domestic | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Revenues 1,568.5 1,694.8 3,062.8 3,204.2
AN Reportable Segment, Domestic | Transferred over Time        
Disaggregation of Revenue [Line Items]        
Revenues [1] 224.6 225.7 446.9 433.7
AN Reportable Segment, Domestic | New vehicle        
Disaggregation of Revenue [Line Items]        
Revenues 890.8 985.1 1,717.6 1,845.3
AN Reportable Segment, Domestic | Used vehicle        
Disaggregation of Revenue [Line Items]        
Revenues 500.7 527.2 1,000.1 1,013.3
AN Reportable Segment, Domestic | Parts and service        
Disaggregation of Revenue [Line Items]        
Revenues 291.0 289.3 573.0 558.3
AN Reportable Segment, Domestic | Finance and insurance, net        
Disaggregation of Revenue [Line Items]        
Revenues 109.7 118.5 217.3 220.3
AN Reportable Segment, Domestic | Other        
Disaggregation of Revenue [Line Items]        
Revenues 0.9 0.4 1.7 0.7
AN Reportable Segment, Import        
Disaggregation of Revenue [Line Items]        
Revenues 2,233.1 2,148.3 4,281.2 4,195.6
AN Reportable Segment, Import | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Revenues 1,962.8 1,870.6 3,750.3 3,661.0
AN Reportable Segment, Import | Transferred over Time        
Disaggregation of Revenue [Line Items]        
Revenues [1] 270.3 277.7 530.9 534.6
AN Reportable Segment, Import | New vehicle        
Disaggregation of Revenue [Line Items]        
Revenues 1,170.2 1,129.6 2,205.5 2,191.6
AN Reportable Segment, Import | Used vehicle        
Disaggregation of Revenue [Line Items]        
Revenues 578.5 549.6 1,132.5 1,096.3
AN Reportable Segment, Import | Parts and service        
Disaggregation of Revenue [Line Items]        
Revenues 354.5 343.0 689.0 661.6
AN Reportable Segment, Import | Finance and insurance, net        
Disaggregation of Revenue [Line Items]        
Revenues 127.1 123.7 249.4 242.2
AN Reportable Segment, Import | Other        
Disaggregation of Revenue [Line Items]        
Revenues 2.8 2.4 4.8 3.9
AN Reportable Segment, Premium Luxury        
Disaggregation of Revenue [Line Items]        
Revenues 2,579.7 2,555.8 5,021.2 5,132.3
AN Reportable Segment, Premium Luxury | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Revenues 2,179.4 2,178.2 4,231.1 4,385.5
AN Reportable Segment, Premium Luxury | Transferred over Time        
Disaggregation of Revenue [Line Items]        
Revenues [1] 400.3 377.6 790.1 746.8
AN Reportable Segment, Premium Luxury | New vehicle        
Disaggregation of Revenue [Line Items]        
Revenues 1,231.7 1,281.6 2,380.6 2,607.5
AN Reportable Segment, Premium Luxury | Used vehicle        
Disaggregation of Revenue [Line Items]        
Revenues 766.1 722.3 1,500.3 1,434.4
AN Reportable Segment, Premium Luxury | Parts and service        
Disaggregation of Revenue [Line Items]        
Revenues 470.3 437.4 924.7 861.8
AN Reportable Segment, Premium Luxury | Finance and insurance, net        
Disaggregation of Revenue [Line Items]        
Revenues 111.4 114.3 215.0 228.4
AN Reportable Segment, Premium Luxury | Other        
Disaggregation of Revenue [Line Items]        
Revenues 0.2 0.2 0.6 0.2
Corporate and other        
Disaggregation of Revenue [Line Items]        
Revenues [2] 323.9 349.8 669.8 699.0
Corporate and other | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Revenues [2] 227.3 245.4 474.0 490.7
Corporate and other | Transferred over Time        
Disaggregation of Revenue [Line Items]        
Revenues [1],[2] 96.6 104.4 195.8 208.3
Corporate and other | New vehicle        
Disaggregation of Revenue [Line Items]        
Revenues [2] 0.0 0.0 0.0 0.0
Corporate and other | Used vehicle        
Disaggregation of Revenue [Line Items]        
Revenues [2] 166.1 185.9 342.3 363.4
Corporate and other | Parts and service        
Disaggregation of Revenue [Line Items]        
Revenues [2] 147.2 151.4 297.2 303.4
Corporate and other | Finance and insurance, net        
Disaggregation of Revenue [Line Items]        
Revenues [2] 9.4 11.2 27.9 29.3
Corporate and other | Other        
Disaggregation of Revenue [Line Items]        
Revenues [2] $ 1.2 $ 1.3 $ 2.4 $ 2.9
[1]
(2) Represents revenue recognized during the period for automotive repair and maintenance services.
[2]
(1) “Corporate and other” is comprised of our non-franchised businesses, including AutoNation USA stores, collision centers, parts distribution centers, and auction operations.