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ACQUISITIONS AND DISPOSITIONS (Details) $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2021 USD ($) dealership franchise	Jun. 30, 2021 dealership	Jun. 30, 2021 franchise	Jun. 30, 2021 USD ($)	Jun. 30, 2021 dealerships	Jun. 30, 2020 USD ($)
U.S.
Acquisitions and Dispositions
Number of dealerships disposed | dealership		2
Number of franchises disposed			2		1
Net pre-tax gain (loss) on dealership dispositions				$ 1.8
U.S. | Two Franchises
Acquisitions and Dispositions
Number of dealerships acquired | dealership		2
Number of franchises acquired | franchise			2
Aggregate consideration paid for dealerships				49.9
Goodwill				22.6
U.S. | Collision Center
Acquisitions and Dispositions
Aggregate consideration paid for dealerships						$ 1.3
United Kingdom
Acquisitions and Dispositions
Goodwill				2.2
Number of dealerships disposed | dealership		1
Number of franchises disposed | franchise			1
Net pre-tax gain (loss) on dealership dispositions				$ (0.6)
United Kingdom | Forecast | Subsequent Event
Acquisitions and Dispositions
Number of dealerships acquired | dealership	7
Aggregate consideration paid for dealerships	$ 36.0
United Kingdom | Seven Franchises | Forecast | Subsequent Event
Acquisitions and Dispositions
Number of franchises acquired | franchise	9

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