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INVENTORIES AND FLOOR PLAN NOTES PAYABLE - Schedule of Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Inventory [Line Items] |  |
Total inventories | $ 5,749.0 | $ 5,911.7
New vehicles |  |
Inventory [Line Items] |  |
Total inventories | 3,325.2 | 3,555.3
Used vehicles |  |
Inventory [Line Items] |  |
Total inventories | 2,155.4 | 2,085.6
Parts and accessories |  |
Inventory [Line Items] |  |
Total inventories | $ 268.4 | $ 270.8

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