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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