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ACQUISITIONS - Other Acquisitions (Details) $ in Millions		12 Months Ended
	Aug. 01, 2024 USD ($) dealership center	Dec. 31, 2024 USD ($) dealership center	Dec. 31, 2023 USD ($) dealership	Dec. 31, 2022 USD ($) dealership
Business Acquisition
Additions through acquisitions | $		$ 449.4	$ 49.7
Inchcape plc’s
Business Acquisition
Number of dealerships acquired | dealership	54
Number of collision centers | center	3
Aggregate consideration paid for dealerships | $	$ 517.0
U.S.
Business Acquisition
Number of dealerships acquired | dealership		9	6	6
Aggregate consideration paid for dealerships | $		$ 690.4	$ 365.8	$ 507.5
Additions through acquisitions | $		$ 288.3	49.7	236.1
U.S. | Honda Dealership
Business Acquisition
Number of dealerships acquired | dealership		3
U.S. | Lexus Dealership
Business Acquisition
Number of dealerships acquired | dealership		2
U.S. | Toyota Dealership
Business Acquisition
Number of dealerships acquired | dealership		1
U.S. | Kia Dealership
Business Acquisition
Number of dealerships acquired | dealership		1
U.S. | Hyundai Dealership
Business Acquisition
Number of dealerships acquired | dealership		1
U.S. | Mercedes-Benz Dealership
Business Acquisition
Number of dealerships acquired | dealership		1
U.S. | Inchcape plc’s
Business Acquisition
Number of collision centers | center		3
U.S. | Toyota Certified Pre-owned Center
Business Acquisition
Number Of Certified Pre-Owned Center | center		1
U.K.
Business Acquisition
Number of dealerships acquired | dealership		5
Additions through acquisitions | $		$ 161.1	$ 0.0
U.K. | Mercedes-Benz Dealership
Business Acquisition
Number of dealerships acquired | dealership		4
Aggregate consideration paid for dealerships | $		$ 110.1
Cash paid | $		111.1
Additions through acquisitions | $		46.3
U.K. | Mercedes-Benz Dealership | Scenario, Plan
Business Acquisition
Cash paid | $		$ 1.1
U.K. | BMW/MINI Dealership
Business Acquisition
Number of dealerships acquired | dealership		1
U.K. | Other Acquisitions
Business Acquisition
Aggregate consideration paid for dealerships | $				34.1
Additions through acquisitions | $				$ 10.2

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