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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Revenues $ 9,221.0 $ 8,277.0 $ 27,014.7 $ 23,368.0
Gross profit 1,430.4 1,371.3 4,189.5 3,968.2
Floor plan interest expense (76.6) (40.2) (214.0) (102.6)
SG&A (943.6) (850.8) (2,853.0) (2,458.1)
Operations income 424.2 465.3 1,159.3 1,319.9
Income before income taxes 288.2 361.3 791.4 1,082.6
Depreciation and amortization     (219.7) (154.9)
Other interest expense (64.5) (58.5) (189.3) (141.5)
Other income (expense), net 5.1 (5.3) 35.4 6.8
Operating segments        
Segment Reporting Information [Line Items]        
Income before income taxes 330.7 411.2 915.3 1,234.2
Operating segments | Vehicle Operations        
Segment Reporting Information [Line Items]        
Revenues 9,221.0 8,277.0 27,014.7 23,368.0
Gross profit 1,430.4 1,371.3 4,189.5 3,968.2
Floor plan interest expense (76.6) (40.2) (214.0) (102.6)
SG&A (1,024.0) (915.5) (3,066.6) (2,587.6)
Operations income 329.8 415.6 908.9 1,278.1
Operating segments | Financing Operations        
Segment Reporting Information [Line Items]        
SG&A (11.2) (9.2) (33.0) (27.3)
Interest and fee income 91.1 67.5 252.2 176.2
Interest expense (51.2) (42.5) (146.0) (125.5)
Total interest margin 39.9 25.0 106.2 50.7
Lease income 25.6 4.9 61.2 14.1
Lease costs (21.6) (2.0) (51.0) (6.3)
Lease income, net 4.0 2.9 10.2 7.8
Provision expense (31.8) (23.1) (77.0) (75.0)
Financing operations income (loss) 0.9 (4.4) 6.4 (43.8)
Corporate and other        
Segment Reporting Information [Line Items]        
Income before income taxes 80.4 64.7 213.6 129.5
Segment reconciling items        
Segment Reporting Information [Line Items]        
Depreciation and amortization (63.5) (50.8) (183.6) (146.4)
Other interest expense (64.5) (58.5) (189.3) (141.5)
Other income (expense), net $ 5.1 $ (5.3) $ 35.4 $ 6.8