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Segment Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
segments
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | segments 3    
Revenues $ 26,985.0 $ 25,844.0 $ 20,390.0
Floorplan interest expense 41.4 25.7 63.8
Depreciation and amortization 200.3 193.3 198.9
Capital expenditures 336.2 231.9 137.2
Segment assets 10,059.7 8,943.6 9,887.2
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 1,983.1 1,877.1 499.4
Other interest expense (134.9) (93.0) (93.7)
Other income, net (14.7) 24.3 144.4
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 1,833.5 1,808.4 550.1
AN Reportable Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 25,955.9 24,988.3 19,681.4
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 2,268.6 2,147.9 1,219.8
AN Reportable Segment, Domestic [Member]      
Segment Reporting Information [Line Items]      
Revenues 7,987.5 7,959.9 6,490.6
Floorplan interest expense 14.4 7.9 23.8
Depreciation and amortization 39.1 39.3 39.8
Capital expenditures 32.8 15.5 17.9
Segment assets 1,974.3 1,758.5 2,130.0
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 565.3 595.8 355.2
AN Reportable Segment, Import [Member]      
Segment Reporting Information [Line Items]      
Revenues 7,690.3 7,798.5 5,988.0
Floorplan interest expense 4.8 5.1 12.9
Depreciation and amortization 35.6 33.9 33.6
Capital expenditures 70.1 27.1 25.7
Segment assets 1,555.6 1,424.2 1,764.7
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 734.2 714.7 386.4
AN Reportable Segment, Premium Luxury [Member]      
Segment Reporting Information [Line Items]      
Revenues 10,278.1 9,229.9 7,202.8
Floorplan interest expense 15.0 8.8 21.8
Depreciation and amortization 74.9 64.8 60.5
Capital expenditures 126.5 80.0 51.6
Segment assets 2,996.8 2,668.6 2,752.5
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 969.1 837.4 478.2
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Revenues [1] 1,029.1 855.7 708.6
Floorplan interest expense 7.2 3.9 5.3
Depreciation and amortization 50.7 55.3 65.0
Capital expenditures 106.8 109.3 42.0
Segment assets 3,533.0 3,092.3 3,240.0
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) $ (285.5) $ (270.8) $ (720.4)
[1] (1) “Corporate and other” is comprised of our other businesses, including AutoNation USA used vehicle stores, collision centers, parts distribution centers, and auction operations.