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Segments - Schedule of Certain Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Total revenues $ 36,188.2 $ 31,042.3 $ 28,187.8
Total gross profit 5,561.0 5,228.9 5,152.4
Floor plan interest expense (278.8) (150.9) (38.8)
Advertising expense (250.7) (248.2) (253.6)
Vehicle operations income 1,575.6 1,692.4 1,941.1
Depreciation and amortization (245.6) (195.8) (163.2)
Income before income taxes 1,078.3 1,362.3 1,730.0
Depreciation and amortization (295.3) (204.1) (172.7)
Other interest expense (257.8) (201.2) (129.1)
Other income (expense), net 39.3 22.0 (43.2)
Operating segments      
Segment Reporting Information [Line Items]      
Income before income taxes 1,215.9 1,549.5 1,851.6
Operating segments | Vehicle Operations      
Segment Reporting Information [Line Items]      
Total revenues 36,188.2 31,042.3 28,187.8
Total gross profit 5,561.0 5,228.9 5,154.3
Floor plan interest expense (278.8) (150.9) (38.8)
Personnel expense (2,056.0) (1,850.0) (1,897.3)
Rent and facility expense (701.2) (552.1) (466.7)
Advertising expense (277.4) (271.7) (270.3)
Other vehicle operations expenses (1,047.1) (808.8) (625.7)
Vehicle operations income 1,200.5 1,595.4 1,855.5
Operating segments | Financing Operations      
Segment Reporting Information [Line Items]      
Interest and fee income 347.8 249.4 116.3
Interest expense (195.1) (170.5) (52.2)
Total interest margin 152.7 78.9 64.1
Lease income 74.6 19.1 17.8
Depreciation and amortization (60.3) (8.4) (9.5)
Lease income, net 14.3 10.7 8.3
Provision expense (106.7) (98.8) (44.4)
Other financing operations expenses (44.9) (36.7) (32.0)
Financing operations income (loss) 15.4 (45.9) (4.0)
Corporate and other      
Segment Reporting Information [Line Items]      
Income before income taxes 326.5 187.8 213.9
Segment reconciling items      
Segment Reporting Information [Line Items]      
Depreciation and amortization (245.6) (195.8) (163.2)
Other interest expense (257.8) (201.2) (129.1)
Other income (expense), net $ 39.3 $ 22.0 $ (43.2)