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Segments - Certain Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Total revenues $ 13,124.3 $ 12,672.7 $ 11,821.4
Total segment income for reportable segments 648.5 375.4 337.5
Depreciation, Depletion and Amortization (92.4) (82.4) (75.4)
Other interest expense (73.1) (60.6) (56.0)
Other income, net 58.9 13.8 8.8
Floor plan interest expense:      
Floor plan interest expense 34.4 72.8 62.3
Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 13,103.8 12,642.1 11,813.4
Total segment income for reportable segments 578.3 334.4 257.7
Floor plan interest expense:      
Floor plan interest expense 84.7 127.9 119.6
Operating Segments | Domestic      
Segment Reporting Information [Line Items]      
Total revenues 4,503.0 4,382.4 4,215.0
Total segment income for reportable segments 230.0 123.4 97.6
Floor plan interest expense:      
Floor plan interest expense 30.9 53.6 52.4
Operating Segments | Import      
Segment Reporting Information [Line Items]      
Total revenues 5,448.8 5,267.8 5,038.1
Total segment income for reportable segments 249.8 153.9 116.2
Floor plan interest expense:      
Floor plan interest expense 31.6 44.1 41.6
Operating Segments | Luxury      
Segment Reporting Information [Line Items]      
Total revenues 3,152.0 2,991.9 2,560.3
Total segment income for reportable segments 98.5 57.1 43.9
Floor plan interest expense:      
Floor plan interest expense 22.2 30.2 25.6
Corporate and other      
Segment Reporting Information [Line Items]      
Total revenues 20.5 30.6 8.0
Total segment income for reportable segments 176.7 170.2 202.3
Floor plan interest expense:      
Floor plan interest expense (50.3) (55.1) (57.3)
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Depreciation, Depletion and Amortization (92.3) (82.4) (75.4)
Other interest expense (73.1) (60.6) (56.0)
Other income, net $ 58.9 $ 13.8 $ 8.9