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INVENTORIES (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Components of Inventory [Line Items] |  |  |
Total inventories | $ 2,030.8 |  | $ 1,768.3
Lower of cost or market inventory reserves | 9.4 |  | 8.8
Held-for-sale |  |  |
Components of Inventory [Line Items] |  |  |
Total inventories | 47.9 |  | 84.5
New vehicles |  |  |
Components of Inventory [Line Items] |  |  |
Total inventories | 1,476.6 |  | 1,252.5
Reduction of new vehicle inventory cost by automobile manufacturer incentives | 10.9 |  | 8.3
Reduction to cost of sales | 80.7 | $ 68.9 |
Used vehicles |  |  |
Components of Inventory [Line Items] |  |  |
Total inventories | 405.7 |  | 373.1
Parts and accessories |  |  |
Components of Inventory [Line Items] |  |  |
Total inventories | $ 148.6 |  | $ 142.7

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