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INVENTORIES - Schedule of Inventory (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Components of Inventory [Line Items] |  |
Total inventories | $ 1,978.8 | $ 1,768.3
Held-for-sale |  |
Components of Inventory [Line Items] |  |
Total inventories | 58.7 | 84.5
New vehicles |  |
Components of Inventory [Line Items] |  |
Total inventories | 1,450.6 | 1,252.5
Used vehicles |  |
Components of Inventory [Line Items] |  |
Total inventories | 382.1 | 373.1
Parts and accessories |  |
Components of Inventory [Line Items] |  |
Total inventories | $ 146.0 | $ 142.7

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