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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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Components of Inventory [Line Items]

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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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