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Segments (Schedule of Certain Financial Information on a Segment Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 6,169.8 | $ 3,620.2 | $ 16,522.2 | $ 9,182.5
Income before income taxes | 422.2 | 219.1 | 1,053.0 | 391.6
Depreciation and amortization |  |  | (91.5) | (67.3)
Other interest expense | (28.0) | (16.6) | (79.6) | (50.4)
Other income (expense), net | (25.7) | 2.2 | (14.6) | 8.2
Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 6,141.7 | 3,616.1 | 16,493.9 | 9,169.9
Income before income taxes | 487.5 | 222.9 | 1,158.6 | 397.6
Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,819.2 | 1,214.7 | 5,018.5 | 3,286.9
Income before income taxes | 123.6 | 81.1 | 335.6 | 168.3
Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,727.4 | 1,551.7 | 7,149.6 | 3,833.5
Income before income taxes | 255.4 | 102.6 | 573.2 | 176.2
Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,595.1 | 849.7 | 4,325.8 | 2,049.5
Income before income taxes | 108.5 | 39.2 | 249.8 | 53.1
Corporate and other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 28.1 | 4.1 | 28.3 | 12.6
Income before income taxes | 22.8 | 33.5 | 80.1 | 103.5
Segment reconciling items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | (34.4) | (22.9) | (91.5) | (67.3)
Other interest expense | (28.0) | (16.6) | (79.6) | (50.4)
Other income (expense), net | (25.7) | 2.2 | (14.6) | 8.2
New vehicle retail |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,898.2 | 1,883.3 | 8,237.7 | 4,624.6
New vehicle retail | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 766.1 | 621.3 | 2,305.3 | 1,591.0
New vehicle retail | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,376.9 | 823.7 | 3,730.7 | 1,996.6
New vehicle retail | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 750.9 | 440.0 | 2,204.1 | 1,038.2
Used vehicle retail |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,079.5 | 1,093.2 | 5,236.6 | 2,889.7
Used vehicle retail | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 699.7 | 378.8 | 1,803.7 | 1,096.4
Used vehicle retail | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 847.9 | 452.2 | 2,127.8 | 1,152.8
Used vehicle retail | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 530.3 | 261.6 | 1,309.9 | 642.2
Used vehicle wholesale |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 260.9 | 98.8 | 613.5 | 216.8
Used vehicle wholesale | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 74.5 | 31.9 | 174.4 | 77.7
Used vehicle wholesale | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 99.5 | 42.2 | 247.8 | 88.7
Used vehicle wholesale | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 72.8 | 24.7 | 171.9 | 50.2
Finance and insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 297.0 | 160.5 | 765.0 | 407.2
Finance and insurance | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 80.5 | 53.2 | 217.7 | 149.2
Finance and insurance | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 162.9 | 81.2 | 408.9 | 195.1
Finance and insurance | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 56.1 | 25.5 | 145.7 | 60.1
Service, body and parts |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 578.3 | 359.5 | 1,503.4 | 964.9
Service, body and parts | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 170.2 | 118.0 | 450.0 | 337.5
Service, body and parts | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 235.3 | 141.3 | 596.9 | 371.4
Service, body and parts | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 162.8 | 96.0 | 434.7 | 244.8
Fleet and other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 55.9 | 24.9 | 166.0 | 79.3
Fleet and other | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 28.2 | 11.5 | 67.4 | 35.1
Fleet and other | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 4.9 | 11.1 | 37.5 | 28.9
Fleet and other | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 22.2 | $ 1.9 | $ 59.5 | $ 14.0

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