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ACQUISITIONS (Details) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) dealership	Sep. 30, 2022 USD ($) dealership	Dec. 31, 2021 USD ($)	Oct. 27, 2023 USD ($)	Dec. 31, 2022 USD ($)
Acquisitions and Dispositions
Cash paid	$ 363.7	$ 424.2
Goodwill	1,695.9				$ 1,661.8
Prime Automotive Group
Acquisitions and Dispositions
Aggregate consideration			$ 33.4
Prime Automotive Group | Subsequent Event
Acquisitions and Dispositions
Goodwill				$ 33.4
U.S.
Acquisitions and Dispositions
Number of dealerships acquired | dealership		5
Aggregate consideration	363.4	$ 393.0
Goodwill acquired	$ 58.8	194.0
U.S. | Chevrolet Dealership
Acquisitions and Dispositions
Number of dealerships acquired | dealership	1
U.S. | Kia Dealership
Acquisitions and Dispositions
Number of dealerships acquired | dealership	1
U.S. | Buick-GMC Dealerships
Acquisitions and Dispositions
Number of dealerships acquired | dealership	3
U.K. | Collision Center
Acquisitions and Dispositions
Goodwill acquired		9.2
Cash paid		$ 32.8

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