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Segments (Schedule of Certain Financial Information on a Segment Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Total revenues $ 4,343.0 $ 2,803.8
Income before income taxes 211.4 64.2
Depreciation and amortization (26.8) (22.0)
Other interest expense (23.5) (17.0)
Other income, net 3.4 2.3
Operating segments    
Segment Reporting Information [Line Items]    
Total revenues 4,346.3 2,794.4
Income before income taxes 219.5 54.1
Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 1,310.0 1,000.4
Income before income taxes 73.9 27.8
Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 1,864.8 1,175.9
Income before income taxes 101.5 24.7
Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 1,171.5 618.1
Income before income taxes 44.1 1.6
Corporate and other    
Segment Reporting Information [Line Items]    
Total revenues (3.3) 9.4
Income before income taxes 38.8 46.8
Segment reconciling items    
Segment Reporting Information [Line Items]    
Depreciation and amortization (26.8) (22.0)
Other interest expense (23.5) (17.0)
Other income, net 3.4 2.3
New vehicle retail    
Segment Reporting Information [Line Items]    
Total revenues 2,193.2 1,373.5
New vehicle retail | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 614.6 470.6
New vehicle retail | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 968.1 600.3
New vehicle retail | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 614.1 301.0
Used vehicle retail    
Segment Reporting Information [Line Items]    
Total revenues 1,352.2 874.4
Used vehicle retail | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 462.2 327.7
Used vehicle retail | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 562.1 354.8
Used vehicle retail | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 331.2 191.1
Used vehicle wholesale    
Segment Reporting Information [Line Items]    
Total revenues 135.2 66.7
Used vehicle wholesale | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 36.2 26.1
Used vehicle wholesale | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 58.3 26.1
Used vehicle wholesale | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 39.8 14.2
Finance and insurance    
Segment Reporting Information [Line Items]    
Total revenues 198.4 121.9
Finance and insurance | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 58.6 45.1
Finance and insurance | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 105.5 58.1
Finance and insurance | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 36.9 16.9
Service, body and parts    
Segment Reporting Information [Line Items]    
Total revenues 404.0 329.9
Service, body and parts | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 120.8 117.2
Service, body and parts | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 156.7 124.8
Service, body and parts | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 121.7 83.4
Fleet and other    
Segment Reporting Information [Line Items]    
Total revenues 60.0 37.4
Fleet and other | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 17.6 13.7
Fleet and other | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 14.1 11.8
Fleet and other | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues $ 27.8 $ 11.5