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INVENTORIES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Components of Inventory [Line Items] |  |  |  |  |
Total inventories | $ 2,318.9 |  | $ 2,318.9 |  | $ 1,978.8
Reduction of new vehicle inventory cost by automobile manufacturer incentives | (9.8) |  | (9.8) |  | (9.7)
Held-for-sale |  |  |  |  |
Components of Inventory [Line Items] |  |  |  |  |
Total inventories | 20.0 |  | 20.0 |  | 58.7
New vehicles |  |  |  |  |
Components of Inventory [Line Items] |  |  |  |  |
Total inventories | 1,688.5 |  | 1,688.5 |  | 1,450.6
Reduction of new vehicle inventory cost by automobile manufacturer incentives | (16.3) |  | (16.3) |  | (13.8)
Reduction to cost of sales | 32.4 | $ 27.5 | 93.9 | $ 80.7 |
Used vehicles |  |  |  |  |
Components of Inventory [Line Items] |  |  |  |  |
Total inventories | 469.6 |  | 469.6 |  | 382.1
Parts and accessories |  |  |  |  |
Components of Inventory [Line Items] |  |  |  |  |
Total inventories | $ 160.8 |  | $ 160.8 |  | $ 146.0

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