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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Revenues $ 26,985.0 $ 25,844.0 $ 20,390.0
Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 23,889.9 23,072.9 17,900.4
Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [1] 3,095.1 2,771.1 2,489.6
New Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 11,754.4 12,081.7 10,418.6
Used Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 9,661.8 8,638.8 5,601.3
Parts and Service [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 4,100.6 3,706.6 3,257.4
Finance and Insurance, Net [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,437.3 1,384.5 1,059.3
Product and Service, Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 30.9 32.4 53.4
AN Reportable Segment, Domestic [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 7,987.5 7,959.9 6,490.6
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 7,226.9 7,260.7 5,841.6
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [1] 760.6 699.2 649.0
AN Reportable Segment, Domestic [Member] | New Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 3,409.1 3,601.8 3,411.1
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 3,022.3 2,875.0 1,781.4
AN Reportable Segment, Domestic [Member] | Parts and Service [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,092.7 1,007.6 891.5
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 460.3 469.1 370.5
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 3.1 6.4 36.1
AN Reportable Segment, Import [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 7,690.3 7,798.5 5,988.0
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 6,896.2 7,079.0 5,343.8
AN Reportable Segment, Import [Member] | Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [1] 794.1 719.5 644.2
AN Reportable Segment, Import [Member] | New Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 3,473.0 3,969.8 3,283.7
AN Reportable Segment, Import [Member] | Used Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 2,652.7 2,370.5 1,516.5
AN Reportable Segment, Import [Member] | Parts and Service [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,050.9 950.0 811.3
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 494.1 489.6 361.7
AN Reportable Segment, Import [Member] | Product and Service, Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 19.6 18.6 14.8
AN Reportable Segment, Premium Luxury [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 10,278.1 9,229.9 7,202.8
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 9,063.1 8,197.6 6,301.3
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [1] 1,215.0 1,032.3 901.5
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 4,872.3 4,510.1 3,723.8
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 3,499.8 3,067.4 2,125.9
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,448.6 1,246.7 1,058.1
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 453.8 401.0 294.7
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 3.6 4.7 0.3
Corporate and Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] 1,029.1 855.7 708.6
Corporate and Other [Member] | Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] 703.7 535.6 413.7
Corporate and Other [Member] | Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [1],[2] 325.4 320.1 294.9
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] 487.0 325.9 177.5
Corporate and Other [Member] | Parts and Service [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] 508.4 502.3 496.5
Corporate and Other [Member] | Finance and Insurance, Net [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] 29.1 24.8 32.4
Corporate and Other [Member] | Product and Service, Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues [2] $ 4.6 $ 2.7 $ 2.2
[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, and auction operations.