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SEGMENTS - Schedule of Certain Financial Information on a Segment Basis (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Vehicle operations revenue | $ 9,231.8 | $ 8,111.5 | $ 17,793.6 | $ 15,091.0
Vehicle operations gross profit | 1,423.9 | 1,385.1 | 2,759.1 | 2,596.3
Floor plan interest expense | (76.6) | (34.7) | (137.3) | (62.3)
Selling, general and administrative | (975.2) | (842.2) | (1,909.5) | (1,606.6)
Vehicle operations income | 393.6 | 475.8 | 735.0 | 854.6
Depreciation and amortization | (62.3) | (48.4) | (120.0) | (95.6)
Income before income taxes | 282.8 | 407.0 | 503.3 | 721.3
Depreciation and amortization |  |  | (165.4) | (100.0)
Other interest expense | (61.2) | (43.9) | (124.8) | (83.0)
Other income, net | 27.0 | 9.8 | 30.4 | 12.0
Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income before income taxes | 301.8 | 483.3 | 584.4 | 823.0
Operating segments | Vehicle Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Vehicle operations revenue | 9,231.8 | 8,111.5 | 17,793.6 | 15,091.0
Vehicle operations gross profit | 1,423.9 | 1,385.1 | 2,759.1 | 2,596.3
Floor plan interest expense | (76.6) | (34.7) | (137.3) | (62.3)
Selling, general and administrative | (1,052.7) | (848.4) | (2,042.8) | (1,671.5)
Vehicle operations income | 294.6 | 502.0 | 579.0 | 862.5
Operating segments | Financing Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Selling, general and administrative | (11.1) | (9.3) | (21.8) | (17.9)
Interest and fee income | 83.8 | 59.4 | 161.1 | 108.7
Interest expense | (47.0) | (45.6) | (94.8) | (83.1)
Total interest margin | 36.8 | 13.8 | 66.3 | 25.6
Lease income | 29.0 | 4.6 | 51.4 | 9.2
Depreciation and amortization | (27.3) | (2.0) | (45.3) | (4.4)
Lease income, net | 1.7 | 2.6 | 6.1 | 4.8
Provision expense | (20.2) | (25.8) | (45.2) | (52.0)
Financing operations income (loss) | 7.2 | (18.7) | 5.4 | (39.5)
Corporate and other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income before income taxes | 77.5 | 6.2 | 133.3 | 64.9
Segment reconciling items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | (62.3) | (48.4) | (120.0) | (95.6)
Other interest expense | (61.2) | (43.9) | (124.8) | (83.0)
Other income, net | $ 27.0 | $ 9.8 | $ 30.4 | $ 12.0

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