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INVENTORIES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Components of Inventory [Line Items]
Total inventories	$ 1,822.4		$ 1,978.8
Reduction of new vehicle inventory cost by automobile manufacturer incentives	(9.0)		(9.7)
Held-for-sale
Components of Inventory [Line Items]
Total inventories	75.3		58.7
New vehicles
Components of Inventory [Line Items]
Total inventories	1,320.2		1,450.6
Reduction of new vehicle inventory cost by automobile manufacturer incentives	12.9		13.8
Reduction to cost of sales	29.2	$ 26.3
Used vehicles
Components of Inventory [Line Items]
Total inventories	359.8		382.1
Parts and accessories
Components of Inventory [Line Items]
Total inventories	$ 142.4		$ 146.0

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Amount of inventory reserves for last-in first-out (LIFO) and other inventory valuation methods.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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