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ACQUISITIONS - Other Acquisitions (Details) $ in Millions		1 Months Ended	12 Months Ended
	Nov. 17, 2021 dealership	Nov. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) dealership	Dec. 31, 2020 USD ($)
Business Acquisition
Additions through acquisitions			$ 453.5	$ 1.4
Prime Automotive Group
Business Acquisition
Number of dealerships acquired | dealership	27
Aggregate consideration paid for dealerships		$ 934.2
2021 Acquisitions
Business Acquisition
Aggregate consideration paid for dealerships			166.8
Additions through acquisitions			$ 70.1
U.S.
Business Acquisition
Number of dealerships acquired | dealership			5
Number of franchises acquired | dealership			8
Additions through acquisitions			$ 434.6	1.4
U.S. | Collision Center
Business Acquisition
Aggregate consideration paid for dealerships				1.3
U.K.
Business Acquisition
Number of dealerships acquired | dealership			7
Number of franchises acquired | dealership			9
Additions through acquisitions			$ 18.9	$ 0.0

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