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Segments - Certain Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Total revenues $ 22,831.7 $ 13,124.3 $ 12,672.7
Total segment income for reportable segments 1,484.8 648.5 375.4
Depreciation, Depletion and Amortization (127.3) (92.4) (82.4)
Other interest expense (108.2) (73.1) (60.6)
Other (expense) income, net (52.6) 58.9 13.8
Floor plan interest expense:      
Floor plan interest expense 22.3 34.4 72.8
Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 22,780.9 13,103.8 12,642.1
Total segment income for reportable segments 1,664.4 578.3 334.4
Floor plan interest expense:      
Floor plan interest expense 76.7 84.7 127.9
Operating Segments | Domestic      
Segment Reporting Information [Line Items]      
Total revenues 6,975.3 4,503.0 4,382.4
Total segment income for reportable segments 466.4 230.0 123.4
Floor plan interest expense:      
Floor plan interest expense 24.7 30.9 53.6
Operating Segments | Import      
Segment Reporting Information [Line Items]      
Total revenues 9,690.8 5,448.8 5,267.8
Total segment income for reportable segments 813.4 249.8 153.9
Floor plan interest expense:      
Floor plan interest expense 30.3 31.6 44.1
Operating Segments | Luxury      
Segment Reporting Information [Line Items]      
Total revenues 6,114.8 3,152.0 2,991.9
Total segment income for reportable segments 384.6 98.5 57.1
Floor plan interest expense:      
Floor plan interest expense 21.7 22.2 30.2
Corporate and other      
Segment Reporting Information [Line Items]      
Total revenues 50.8 20.5 30.6
Total segment income for reportable segments 108.5 176.7 170.2
Floor plan interest expense:      
Floor plan interest expense (54.4) (50.3) (55.1)
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Depreciation, Depletion and Amortization (127.3) (92.3) (82.4)
Other interest expense (108.2) (73.1) (60.6)
Other (expense) income, net $ (52.6) $ 58.9 $ 13.8