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Segment Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
segments
Dec. 31, 2020
USD ($)
segments
Dec. 31, 2019
USD ($)
segments
Segment Reporting Information [Line Items]      
Number of reportable segments | segments 3 3 3
Revenues $ 25,844.0 $ 20,390.0 $ 21,335.7
Floorplan interest expense 25.7 63.8 138.4
Depreciation and amortization 193.3 198.9 180.5
Capital expenditures 231.9 137.2 257.4
Segment assets 8,943.6 9,887.2 10,543.3
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 1,877.1 499.4 685.2
Other interest expense (93.0) (93.7) (106.7)
Other income, net 24.3 144.4 34.1
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 1,808.4 550.1 612.6
AN Reportable Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 24,988.3 19,681.4 20,574.9
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 2,147.9 1,219.8 957.3
AN Reportable Segment, Domestic [Member]      
Segment Reporting Information [Line Items]      
Revenues 7,959.9 6,490.6 6,671.4
Floorplan interest expense 7.9 23.8 51.8
Depreciation and amortization 39.3 39.8 37.2
Capital expenditures 15.5 17.9 38.6
Segment assets 1,758.5 2,130.0 2,483.6
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 595.8 355.2 257.6
AN Reportable Segment, Import [Member]      
Segment Reporting Information [Line Items]      
Revenues 7,798.5 5,988.0 6,468.7
Floorplan interest expense 5.1 12.9 30.7
Depreciation and amortization 33.9 33.6 33.4
Capital expenditures 27.1 25.7 23.2
Segment assets 1,424.2 1,764.7 1,842.1
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 714.7 386.4 318.6
AN Reportable Segment, Premium Luxury [Member]      
Segment Reporting Information [Line Items]      
Revenues 9,229.9 7,202.8 7,434.8
Floorplan interest expense 8.8 21.8 47.3
Depreciation and amortization 64.8 60.5 53.5
Capital expenditures 80.0 51.6 145.3
Segment assets 2,668.6 2,752.5 3,150.5
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 837.4 478.2 381.1
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Revenues 855.7 708.6 760.8
Floorplan interest expense 3.9 5.3 8.6
Depreciation and amortization 55.3 65.0 56.4
Capital expenditures 109.3 42.0 50.3
Segment assets 3,092.3 3,240.0 3,067.1
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) $ (270.8) $ (720.4) $ (272.1)