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INVENTORIES AND FLOOR PLAN NOTES PAYABLE (Tables) | 3 Months Ended
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Mar. 31, 2024
Inventory Disclosure [Abstract] |
Schedule of Inventories | The components of inventories, net, consisted of the following:
(in millions) |  | March 31, 2024 |  | December 31, 2023
New vehicles |  | $ | 3,447.5 |  |  | $ | 2,886.3 |
Used vehicles |  | 2,142.8 |  |  | 1,637.5 |
Parts and accessories |  | 271.6 |  |  | 230.1 |
Total inventories |  | $ | 5,861.9 |  |  | $ | 4,753.9 |
Schedule of Debt |
(in millions) |  | March 31, 2024 |  | December 31, 2023
Floor plan notes payable |  | $ | 2,533.3 |  |  | $ | 1,347.0 |
Floor plan notes payable: non-trade |  | 2,428.7 |  |  | 2,288.5 |
Total floor plan debt |  | $ | 4,962.0 |  |  | $ | 3,635.5 |

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