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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)

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