INVENTORIES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Components of Inventory [Line Items]
Lower of cost or market inventory reserves	$ 8.8	$ 10.7
New vehicles
Schedule of Components of Inventory [Line Items]
Reduction of new vehicle inventory cost by automobile manufacturer incentives	8.3	2.7
Reduction to new vehicle cost of sales by automobile manufacturer incentives	$ 94.1	$ 91.5	$ 60.4