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ACQUISITIONS AND DISPOSITIONS (Details) $ in Millions		1 Months Ended	9 Months Ended
	Sep. 13, 2021 USD ($) franchise dealership center	Oct. 31, 2021 USD ($) dealership franchise	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) dealership	Sep. 30, 2021 USD ($) franchise	Sep. 30, 2020 USD ($)
Acquisitions and Dispositions
Purchase price			$ 74.6			$ 1.3
Escrow deposit			20.0	$ 20.0	$ 20.0
Subsequent Event
Acquisitions and Dispositions
Aggregate consideration paid		$ 66.8
Prime Automotive Group | Scenario, Plan
Acquisitions and Dispositions
Number of dealerships acquired | dealership	30
Number of franchises acquired | franchise	43
Purchase price	$ 880.0
Number of collision centers | center	3,000,000
Three Dealership | Subsequent Event
Acquisitions and Dispositions
Number of dealerships acquired | dealership		3
Number of franchises acquired | franchise		6
U.S.
Acquisitions and Dispositions
Number of dealerships disposed | dealership				2
Number of franchises disposed				1	2
Net pre-tax gain (loss) on dealership dispositions			1.8
U.S. | 2021 Acquisitions
Acquisitions and Dispositions
Number of dealerships acquired | dealership				2
Number of franchises acquired | franchise					2
Aggregate consideration paid			74.6
Goodwill acquired			41.4
U.S. | Collision Center
Acquisitions and Dispositions
Aggregate consideration paid						$ 1.3
United Kingdom
Acquisitions and Dispositions
Number of dealerships disposed | dealership				1
Number of franchises disposed | franchise					1
Goodwill disposal			$ 2.2
United Kingdom | 2021 Acquisitions
Acquisitions and Dispositions
Number of dealerships acquired | dealership				7
Number of franchises acquired | franchise					9

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