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Segment Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
segments
Dec. 31, 2019
USD ($)
segments
Dec. 31, 2018
USD ($)
segments
Segment Reporting Information [Line Items]      
Number of reportable segments | segments 3 3 3
Revenues $ 20,390.0 $ 21,335.7 $ 21,412.8
Floorplan interest expense 63.8 138.4 130.4
Depreciation and amortization 198.9 180.5 166.2
Capital expenditures 137.2 257.4 393.6
Segment assets 9,887.2 10,543.3  
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 499.4 685.2 647.5
Other interest expense (93.7) (106.7) (119.4)
Interest income 0.3 0.5 1.1
Other income, net 144.1 33.6 0.2
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 550.1 612.6 529.4
AN Reportable Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 19,681.4 20,574.9 20,931.8
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 1,219.8 957.3 894.9
AN Reportable Segment, Domestic [Member]      
Segment Reporting Information [Line Items]      
Revenues 6,490.6 6,671.4 7,134.5
Floorplan interest expense 23.8 51.8 51.3
Depreciation and amortization 39.8 37.2 37.3
Capital expenditures 17.9 38.6 77.7
Segment assets 2,130.0 2,483.6  
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 355.2 257.6 249.3
AN Reportable Segment, Import [Member]      
Segment Reporting Information [Line Items]      
Revenues 5,988.0 6,468.7 6,786.4
Floorplan interest expense 12.9 30.7 31.0
Depreciation and amortization 33.6 33.4 33.2
Capital expenditures 25.7 23.2 56.2
Segment assets 1,764.7 1,842.1  
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 386.4 318.6 304.7
AN Reportable Segment, Premium Luxury [Member]      
Segment Reporting Information [Line Items]      
Revenues 7,202.8 7,434.8 7,010.9
Floorplan interest expense 21.8 47.3 41.7
Depreciation and amortization 60.5 53.5 47.6
Capital expenditures 51.6 145.3 144.2
Segment assets 2,752.5 3,150.5  
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) 478.2 381.1 340.9
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Revenues 708.6 760.8 481.0
Floorplan interest expense 5.3 8.6 6.4
Depreciation and amortization 65.0 56.4 48.1
Capital expenditures 42.0 50.3 115.5
Segment assets 3,240.0 3,067.1  
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Segment income (loss) $ (720.4) $ (272.1) $ (247.4)