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Segments (Schedule of Certain Financial Information on a Segment Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Total revenues $ 2,849.7 $ 2,659.7
Income before income taxes 77.8 69.8
Depreciation and amortization (19.8) (16.8)
Other interest expense (15.3) (11.8)
Other income, net 2.6 1.3
Operating segments    
Segment Reporting Information [Line Items]    
Total revenues 2,843.2 2,657.5
Income before income taxes 57.8 55.5
Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 996.7 970.6
Income before income taxes 19.8 25.6
Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 1,191.6 1,170.4
Income before income taxes 30.0 23.0
Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 654.9 516.5
Income before income taxes 8.0 6.9
Corporate and other    
Segment Reporting Information [Line Items]    
Total revenues 6.5 2.2
Income before income taxes 52.5 41.6
Segment reconciling items    
Segment Reporting Information [Line Items]    
Depreciation and amortization (19.8) (16.8)
Other interest expense (15.3) (11.8)
Other income, net 2.6 1.3
New vehicle    
Segment Reporting Information [Line Items]    
Total revenues 1,461.1 1,454.7
New vehicle | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 492.4 513.5
New vehicle | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 632.6 667.6
New vehicle | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 339.4 278.5
Used vehicle retail    
Segment Reporting Information [Line Items]    
Total revenues 827.9 715.6
Used vehicle retail | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 300.4 264.8
Used vehicle retail | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 341.3 307.7
Used vehicle retail | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 186.3 142.9
Used vehicle wholesale    
Segment Reporting Information [Line Items]    
Total revenues 77.4 76.0
Used vehicle wholesale | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 29.6 33.6
Used vehicle wholesale | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 27.9 28.2
Used vehicle wholesale | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 19.9 14.2
Finance and insurance    
Segment Reporting Information [Line Items]    
Total revenues 117.5 106.5
Finance and insurance | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 41.8 40.0
Finance and insurance | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 54.8 51.7
Finance and insurance | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 16.5 12.3
Service, body and parts    
Segment Reporting Information [Line Items]    
Total revenues 317.4 285.7
Service, body and parts | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 115.4 107.2
Service, body and parts | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 117.7 109.6
Service, body and parts | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 79.1 64.8
Fleet and other    
Segment Reporting Information [Line Items]    
Total revenues 48.4 21.2
Fleet and other | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 17.1 11.5
Fleet and other | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 17.3 5.6
Fleet and other | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues $ 13.7 $ 3.8