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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Revenues $ 26,948.9 $ 26,985.0 $ 25,844.0
Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 23,442.8 23,889.9 23,072.9
Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [1] 3,506.1 3,095.1 2,771.1
New Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 12,767.4 11,754.4 12,081.7
Used Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 8,198.5 9,661.8 8,638.8
Parts and Service [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 4,533.7 4,100.6 3,706.6
Finance and Insurance, Net [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,418.8 1,437.3 1,384.5
Product and Service, Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 30.5 30.9 32.4
AN Reportable Segment, Domestic [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 7,573.2 7,987.5 7,959.9
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 6,723.2 7,226.9 7,260.7
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [1] 850.0 760.6 699.2
AN Reportable Segment, Domestic [Member] | New Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 3,525.0 3,409.1 3,601.8
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 2,428.4 3,022.3 2,875.0
AN Reportable Segment, Domestic [Member] | Parts and Service [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,184.7 1,092.7 1,007.6
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 432.0 460.3 469.1
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 3.1 3.1 6.4
AN Reportable Segment, Import [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 7,880.9 7,690.3 7,798.5
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 6,988.3 6,896.2 7,079.0
AN Reportable Segment, Import [Member] | Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [1] 892.6 794.1 719.5
AN Reportable Segment, Import [Member] | New Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 3,996.0 3,473.0 3,969.8
AN Reportable Segment, Import [Member] | Used Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 2,222.2 2,652.7 2,370.5
AN Reportable Segment, Import [Member] | Parts and Service [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,150.1 1,050.9 950.0
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 490.1 494.1 489.6
AN Reportable Segment, Import [Member] | Product and Service, Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 22.5 19.6 18.6
AN Reportable Segment, Premium Luxury [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 10,266.4 10,278.1 9,229.9
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 8,911.4 9,063.1 8,197.6
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [1] 1,355.0 1,215.0 1,032.3
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 5,246.4 4,872.3 4,510.1
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 2,979.5 3,499.8 3,067.4
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,593.1 1,448.6 1,246.7
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 446.2 453.8 401.0
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1.2 3.6 4.7
Corporate and Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] 1,228.4 1,029.1 855.7
Corporate and Other [Member] | Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] 819.9 703.7 535.6
Corporate and Other [Member] | Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [1],[2] 408.5 325.4 320.1
Corporate and Other [Member] | New Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] 0.0 0.0 0.0
Corporate and Other [Member] | Used Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] 568.4 487.0 325.9
Corporate and Other [Member] | Parts and Service [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] 605.8 508.4 502.3
Corporate and Other [Member] | Finance and Insurance, Net [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] 50.5 29.1 24.8
Corporate and Other [Member] | Product and Service, Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] $ 3.7 $ 4.6 $ 2.7
[1]
(2) Represents revenue recognized during the period for automotive repair and maintenance services.
[2]
(1) “Corporate and other” is comprised of our other businesses, including AutoNation USA used vehicle stores, collision centers, parts distribution centers, auction operations, and AutoNation Mobile Service.