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ACQUISITIONS AND DIVESTITURES - Pro Forma Information (Details) - Herb Chambers Dealerships - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Business Combination [Line Items]
Pro forma revenue	$ 5,441.6	$ 4,924.1	$ 15,248.2	$ 14,758.7
Pro forma net income	$ 146.1	$ 128.5	$ 439.3	$ 297.3

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