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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Total revenue $ 9,583.0 $ 9,231.8 $ 18,761.2 $ 17,793.6
Total gross profit 1,485.1 1,423.9 2,895.4 2,759.1
Floor plan interest expense (55.0) (76.6) (112.0) (137.3)
Vehicle operations income 425.3 393.6 831.6 735.0
Income before income taxes 352.1 282.8 636.7 503.3
Depreciation and amortization     (158.1) (165.4)
Other interest expense (66.7) (61.2) (132.2) (124.8)
Other income, net 48.5 27.0 49.3 30.4
Operating segments        
Segment Reporting Information [Line Items]        
Income before income taxes 373.3 301.8 694.4 584.4
Operating segments | Vehicle Operations        
Segment Reporting Information [Line Items]        
Total revenue 9,583.0 9,231.8 18,761.2 17,793.6
Total gross profit 1,485.1 1,423.9 2,895.4 2,759.1
Floor plan interest expense (55.0) (76.6) (112.0) (137.3)
Personnel expense (546.6) (537.2) (1,060.7) (1,056.2)
Rent and facility expense (181.2) (177.3) (363.6) (346.2)
Advertising expense (72.4) (69.7) (142.3) (136.6)
Other vehicle operations expenses (276.7) (268.5) (555.0) (503.7)
Vehicle operations income 353.2 294.6 661.9 579.0
Operating segments | Financing Operations        
Segment Reporting Information [Line Items]        
Interest and fee income 98.8 83.8 193.2 161.1
Interest expense (49.8) (47.0) (97.9) (94.8)
Total interest margin 49.0 36.8 95.3 66.3
Lease income 23.7 20.5 44.2 35.6
Lease costs (18.6) (18.8) (35.4) (29.5)
Lease income, net 5.1 1.7 8.8 6.1
Provision expense (21.2) (20.2) (46.7) (45.2)
Other financing operations expenses (12.8) (11.1) (24.8) (21.8)
Financing operations income 20.1 7.2 32.6 5.4
Corporate and other        
Segment Reporting Information [Line Items]        
Income before income taxes 62.2 77.5 154.2 133.3
Segment reconciling items        
Segment Reporting Information [Line Items]        
Depreciation and amortization (65.2) (62.3) (129.0) (120.0)
Other interest expense (66.7) (61.2) (132.2) (124.8)
Other income, net $ 48.5 $ 27.0 $ 49.3 $ 30.4