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Segments - Certain Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Total revenues $ 11,821.4 $ 10,086.5 $ 8,678.2
Income before income taxes 337.5 347.1 283.5
Depreciation and amortization (75.4) (57.7) (49.3)
Other interest expense (56.0) (34.8) (23.2)
Other income (expense), net 8.8 12.2 (6.1)
Interest Expense [Abstract]      
Floor plan interest expense 62.3 39.3 25.6
Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 11,813.4 10,088.7 8,674.7
Income before income taxes 257.7 260.0 247.9
Interest Expense [Abstract]      
Floor plan interest expense 119.6 82.0 56.1
Operating Segments | Domestic      
Segment Reporting Information [Line Items]      
Total revenues 4,215.0 3,845.8 3,381.7
Income before income taxes 97.6 105.2 106.2
Interest Expense [Abstract]      
Floor plan interest expense 52.4 37.2 26.4
Operating Segments | Import      
Segment Reporting Information [Line Items]      
Total revenues 5,038.1 4,432.8 3,764.3
Income before income taxes 116.2 117.8 110.2
Interest Expense [Abstract]      
Floor plan interest expense 41.6 29.0 18.7
Operating Segments | Luxury      
Segment Reporting Information [Line Items]      
Total revenues 2,560.3 1,810.1 1,528.7
Income before income taxes 43.9 37.0 31.5
Interest Expense [Abstract]      
Floor plan interest expense 25.6 15.8 11.0
Corporate And Eliminations      
Segment Reporting Information [Line Items]      
Total revenues 8.0 (2.2) 3.5
Income before income taxes 202.4 167.4 114.2
Interest Expense [Abstract]      
Floor plan interest expense (57.3) (42.7) (30.5)
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Depreciation and amortization (75.4) (57.7) (49.3)
Other interest expense (56.0) (34.8) (23.2)
Other income (expense), net $ 8.8 $ 12.2 $ (6.1)