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ACQUISITIONS - Other Acquisitions (Details) $ in Millions	1 Months Ended	3 Months Ended
	Nov. 30, 2021 USD ($) dealership	Mar. 31, 2022 USD ($) dealership	Mar. 31, 2021 USD ($) dealerships	Nov. 18, 2021 USD ($)
Acquisitions and Dispositions
Cash paid		$ 247.7	$ 49.9
Prime Automotive Group
Acquisitions and Dispositions
Number of dealerships acquired | dealership	28
Total consideration	$ 967.6
Intangible franchise rights				$ 135.3
U.S. | Toyota Dealership
Acquisitions and Dispositions
Number of dealerships acquired		1	2
Total consideration		$ 250.4	$ 49.9
Cash paid		247.7
Liabilities incurred to acquire business		2.7
Goodwill acquired		136.0	$ 22.6
Intangible franchise rights		$ 70.5

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