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Segments (Schedule of Certain Financial Information on a Segment Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Total revenues $ 6,009.4 $ 2,758.6 $ 10,352.4 $ 5,562.3
Income before income taxes 419.4 108.3 630.9 172.5
Depreciation and amortization     (57.1) (44.3)
Other interest expense (28.1) (16.8) (51.6) (33.8)
Other income, net 7.6 3.5 11.1 5.8
Operating segments        
Segment Reporting Information [Line Items]        
Total revenues 6,006.0 2,759.5 10,352.1 5,553.8
Income before income taxes 451.6 120.5 671.1 174.7
Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 1,889.4 1,071.8 3,199.3 2,072.2
Income before income taxes 138.1 59.4 212.0 87.2
Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 2,557.4 1,106.0 4,422.2 2,281.9
Income before income taxes 216.3 48.8 317.8 73.6
Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 1,559.2 581.7 2,730.6 1,199.7
Income before income taxes 97.2 12.3 141.3 13.9
Corporate and other        
Segment Reporting Information [Line Items]        
Total revenues 3.4 (0.9) 0.3 8.5
Income before income taxes 18.6 23.4 57.4 70.1
Segment reconciling items        
Segment Reporting Information [Line Items]        
Depreciation and amortization (30.3) (22.3) (57.1) (44.3)
Other interest expense (28.1) (16.8) (51.6) (33.8)
Other income, net 7.6 3.5 11.1 5.8
New vehicle retail        
Segment Reporting Information [Line Items]        
Total revenues 3,146.2 1,367.8 5,339.5 2,741.3
New vehicle retail | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 924.6 499.1 1,539.2 969.6
New vehicle retail | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 1,385.7 572.7 2,353.8 1,173.0
New vehicle retail | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 839.2 297.2 1,453.3 598.2
Used vehicle retail        
Segment Reporting Information [Line Items]        
Total revenues 1,804.9 922.2 3,157.0 1,796.5
Used vehicle retail | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 641.7 389.9 1,103.9 717.6
Used vehicle retail | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 717.8 345.9 1,280.0 700.6
Used vehicle retail | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 448.4 189.5 779.6 380.6
Used vehicle wholesale        
Segment Reporting Information [Line Items]        
Total revenues 217.4 51.3 352.6 118.0
Used vehicle wholesale | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 63.8 19.8 100.0 45.8
Used vehicle wholesale | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 90.0 20.3 148.3 46.5
Used vehicle wholesale | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 59.3 11.3 99.0 25.5
Finance and insurance        
Segment Reporting Information [Line Items]        
Total revenues 269.6 124.9 467.9 246.7
Finance and insurance | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 78.6 50.9 137.2 96.1
Finance and insurance | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 140.5 55.9 246.0 113.9
Finance and insurance | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 52.6 17.7 89.5 34.6
Service, body and parts        
Segment Reporting Information [Line Items]        
Total revenues 521.0 275.5 925.0 605.4
Service, body and parts | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 159.1 102.2 279.8 219.5
Service, body and parts | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 204.8 105.3 361.5 230.1
Service, body and parts | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 150.1 65.4 271.8 148.8
Fleet and other        
Segment Reporting Information [Line Items]        
Total revenues 50.3 16.9 110.4 54.4
Fleet and other | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 21.6 9.9 39.2 23.6
Fleet and other | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 18.6 5.9 32.6 17.8
Fleet and other | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues $ 9.6 $ 0.6 $ 37.4 $ 12.0