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SEGMENTS - Schedule of Certain Financial Information on a Segment Basis (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Vehicle operations revenue $ 8,561.8 $ 6,973.8
Vehicle operations gross profit 1,335.2 1,211.5
Floor plan interest expense (60.7) (27.7)
Selling, general and administrative (934.3) (764.4)
Operating income 341.4 379.0
Depreciation and amortization (57.8) (47.3)
Income before income taxes 220.6 314.3
Depreciation and amortization (75.9) (49.6)
Other interest expense (63.6) (39.0)
Other income, net 3.5 2.0
Operating segments    
Segment Reporting Information [Line Items]    
Floor plan interest expense (60.7) (27.7)
Income before income taxes 282.7 340.4
Operating segments | Vehicle Operations    
Segment Reporting Information [Line Items]    
Vehicle operations revenue 8,561.8 6,973.8
Vehicle operations gross profit 1,335.2 1,211.5
Selling, general and administrative (990.1) (822.6)
Operating income 284.4 361.2
Operating segments | Financing Operations    
Segment Reporting Information [Line Items]    
Selling, general and administrative (10.6) (8.6)
Interest and fee income 77.3 49.3
Interest expense (47.8) (37.5)
Total interest margin 29.5 11.8
Lease income 22.4 4.6
Depreciation and amortization (18.0) (2.3)
Lease income, net 4.4 2.3
Provision expense (25.0) (26.3)
Financing operations loss (1.7) (20.8)
Corporate and other    
Segment Reporting Information [Line Items]    
Income before income taxes 55.8 58.2
Segment reconciling items    
Segment Reporting Information [Line Items]    
Depreciation and amortization (57.8) (47.3)
Other interest expense (63.6) (39.0)
Other income, net $ 3.5 $ 2.0