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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)

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