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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Vehicle operations revenue $ 9,231.8 $ 8,111.5 $ 17,793.6 $ 15,091.0
Vehicle operations gross profit 1,423.9 1,385.1 2,759.1 2,596.3
Floor plan interest expense (76.6) (34.7) (137.3) (62.3)
Selling, general and administrative (975.2) (842.2) (1,909.5) (1,606.6)
Vehicle operations income 393.6 475.8 735.0 854.6
Depreciation and amortization (62.3) (48.4) (120.0) (95.6)
Income before income taxes 282.8 407.0 503.3 721.3
Depreciation and amortization     (165.4) (100.0)
Other interest expense (61.2) (43.9) (124.8) (83.0)
Other income, net 27.0 9.8 30.4 12.0
Operating segments        
Segment Reporting Information [Line Items]        
Income before income taxes 301.8 483.3 584.4 823.0
Operating segments | Vehicle Operations        
Segment Reporting Information [Line Items]        
Vehicle operations revenue 9,231.8 8,111.5 17,793.6 15,091.0
Vehicle operations gross profit 1,423.9 1,385.1 2,759.1 2,596.3
Floor plan interest expense (76.6) (34.7) (137.3) (62.3)
Selling, general and administrative (1,052.7) (848.4) (2,042.8) (1,671.5)
Vehicle operations income 294.6 502.0 579.0 862.5
Operating segments | Financing Operations        
Segment Reporting Information [Line Items]        
Selling, general and administrative (11.1) (9.3) (21.8) (17.9)
Interest and fee income 83.8 59.4 161.1 108.7
Interest expense (47.0) (45.6) (94.8) (83.1)
Total interest margin 36.8 13.8 66.3 25.6
Lease income 29.0 4.6 51.4 9.2
Depreciation and amortization (27.3) (2.0) (45.3) (4.4)
Lease income, net 1.7 2.6 6.1 4.8
Provision expense (20.2) (25.8) (45.2) (52.0)
Financing operations income (loss) 7.2 (18.7) 5.4 (39.5)
Corporate and other        
Segment Reporting Information [Line Items]        
Income before income taxes 77.5 6.2 133.3 64.9
Segment reconciling items        
Segment Reporting Information [Line Items]        
Depreciation and amortization (62.3) (48.4) (120.0) (95.6)
Other interest expense (61.2) (43.9) (124.8) (83.0)
Other income, net $ 27.0 $ 9.8 $ 30.4 $ 12.0