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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]        
Total revenues $ 7,295.7 $ 6,169.8 $ 21,241.3 $ 16,522.2
Income before income taxes 455.7 422.2 1,393.9 1,053.0
Depreciation and amortization     (122.1) (91.5)
Other interest expense (49.6) (28.0) (114.1) (79.6)
Other income (expense), net (7.1) (25.7) (37.0) (14.6)
Operating segments        
Segment Reporting Information [Line Items]        
Total revenues 7,245.8 6,141.7 21,134.1 16,493.9
Income before income taxes 498.9 487.5 1,549.5 1,158.6
Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 2,401.9 1,819.2 6,942.2 5,018.5
Income before income taxes 127.9 123.6 400.1 335.6
Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 3,000.9 2,727.4 8,667.4 7,149.6
Income before income taxes 261.5 255.4 782.8 573.2
Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 1,843.0 1,595.1 5,524.5 4,325.8
Income before income taxes 109.5 108.5 366.6 249.8
Corporate and other        
Segment Reporting Information [Line Items]        
Total revenues 49.9 28.1 107.2 28.3
Income before income taxes 55.4 22.8 117.6 80.1
Segment reconciling items        
Segment Reporting Information [Line Items]        
Depreciation and amortization (41.9) (34.4) (122.1) (91.5)
Other interest expense (49.6) (28.0) (114.1) (79.6)
Other income (expense), net (7.1) (25.7) (37.0) (14.6)
New vehicle retail        
Segment Reporting Information [Line Items]        
Total revenues 3,306.9 2,898.2 9,619.4 8,237.7
New vehicle retail | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 1,078.3 766.1 3,083.1 2,305.3
New vehicle retail | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 1,389.0 1,376.9 4,022.9 3,730.7
New vehicle retail | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 840.3 750.9 2,513.2 2,204.1
Used vehicle retail        
Segment Reporting Information [Line Items]        
Total revenues 2,465.8 2,079.5 7,197.0 5,236.6
Used vehicle retail | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 832.9 699.7 2,418.7 1,803.7
Used vehicle retail | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 1,015.5 847.9 2,920.9 2,127.8
Used vehicle retail | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 618.2 530.3 1,861.9 1,309.9
Used vehicle wholesale        
Segment Reporting Information [Line Items]        
Total revenues 363.2 260.9 1,131.5 613.5
Used vehicle wholesale | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 115.4 74.5 376.3 174.4
Used vehicle wholesale | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 112.7 99.5 361.2 247.8
Used vehicle wholesale | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 92.1 72.8 300.5 171.9
Finance and insurance        
Segment Reporting Information [Line Items]        
Total revenues 333.3 297.0 977.0 765.0
Finance and insurance | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 98.9 80.5 284.6 217.7
Finance and insurance | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 178.9 162.9 532.3 408.9
Finance and insurance | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 61.2 56.1 187.2 145.7
Service, body and parts        
Segment Reporting Information [Line Items]        
Total revenues 712.2 578.3 2,022.6 1,503.4
Service, body and parts | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 206.7 170.2 597.5 450.0
Service, body and parts | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 292.1 235.3 802.5 596.9
Service, body and parts | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 200.3 162.8 580.3 434.7
Fleet and other        
Segment Reporting Information [Line Items]        
Total revenues 114.3 55.9 293.8 166.0
Fleet and other | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 69.7 28.2 182.0 67.4
Fleet and other | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 12.7 4.9 27.6 37.5
Fleet and other | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues $ 30.9 $ 22.2 $ 81.4 $ 59.5