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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

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