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SEGMENTS - Schedule of Certain Financial Information on a Segment Basis (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Total revenue $ 9,178.3 $ 8,561.8
Total gross profit 1,410.4 1,335.2
Floor plan interest expense (57.1) (60.7)
Vehicle operations income 406.3 341.4
Income before income taxes 284.5 220.6
Depreciation and amortization (77.7) (75.9)
Other interest expense (65.5) (63.6)
Other income, net 0.8 3.5
Operating segments    
Segment Reporting Information [Line Items]    
Income before income taxes 321.2 282.7
Operating segments | Vehicle Operations    
Segment Reporting Information [Line Items]    
Total revenue 9,178.3 8,561.8
Total gross profit 1,410.4 1,335.2
Floor plan interest expense (57.1) (60.7)
Personnel expense (514.1) (519.0)
Rent and facility expense (182.4) (168.9)
Advertising expense (69.9) (67.0)
Other vehicle operations expenses (278.2) (235.2)
Vehicle operations income 308.7 284.4
Operating segments | Financing Operations    
Segment Reporting Information [Line Items]    
Interest and fee income 94.4 77.3
Interest expense (48.1) (47.8)
Total interest margin 46.3 29.5
Lease income 20.5 15.2
Lease costs (16.8) (10.8)
Lease income, net 3.7 4.4
Provision expense (25.5) (25.0)
Other financing operations expenses (12.0) (10.6)
Financing operations income (loss) 12.5 (1.7)
Corporate and other    
Segment Reporting Information [Line Items]    
Income before income taxes 91.9 55.8
Segment reconciling items    
Segment Reporting Information [Line Items]    
Depreciation and amortization (63.9) (57.8)
Other interest expense (65.5) (63.6)
Other income, net $ 0.8 $ 3.5