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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Total revenue $ 9,675.8 $ 9,221.0 $ 28,437.1 $ 27,014.7
Total gross profit 1,466.0 1,430.4 4,361.5 4,189.5
Floor plan interest expense (57.8) (76.6) (169.8) (214.0)
Vehicle operations income 421.6 421.9 1,253.3 1,157.0
Income before income taxes 282.2 285.9 918.9 789.1
Depreciation and amortization     (239.5) (219.7)
Other interest expense (68.3) (64.5) (200.5) (189.3)
Other (expense) income, net (13.3) 5.1 35.9 35.4
Operating segments        
Segment Reporting Information [Line Items]        
Income before income taxes 340.1 328.4 1,034.8 913.0
Operating segments | Vehicle Operations        
Segment Reporting Information [Line Items]        
Total revenue 9,675.8 9,221.0 28,437.1 27,014.7
Total gross profit 1,466.0 1,430.4 4,361.5 4,189.5
Floor plan interest expense (57.8) (76.6) (169.8) (214.0)
Personnel expense (539.6) (505.2) (1,600.3) (1,552.8)
Rent and facility expense (191.6) (178.9) (555.2) (525.0)
Advertising expense (72.7) (69.9) (214.9) (206.5)
Other vehicle operations expenses (283.3) (270.0) (838.2) (782.3)
Vehicle operations income 321.0 329.8 983.1 908.9
Operating segments | Financing Operations        
Segment Reporting Information [Line Items]        
Interest and fee income 104.9 88.8 298.0 249.9
Interest expense (52.1) (51.2) (150.0) (146.0)
Total interest margin 52.8 37.6 148.0 103.9
Lease income 23.4 25.6 67.7 61.2
Lease costs (18.6) (21.6) (54.0) (51.0)
Lease income, net 4.8 4.0 13.7 10.2
Provision expense (25.8) (31.8) (72.5) (77.0)
Other financing operations expenses (12.7) (11.2) (37.5) (33.0)
Financing operations income (loss) 19.1 (1.4) 51.7 4.1
Corporate and other        
Segment Reporting Information [Line Items]        
Income before income taxes 89.2 80.4 243.3 213.7
Segment reconciling items        
Segment Reporting Information [Line Items]        
Depreciation and amortization (65.5) (63.5) (194.6) (183.6)
Other interest expense (68.3) (64.5) (200.5) (189.3)
Other (expense) income, net $ (13.3) $ 5.2 $ 35.9 $ 35.4