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ACQUISITIONS AND DISPOSITIONS - Other Acquisitions and Dispositions (Details) $ in Millions		3 Months Ended		12 Months Ended
	Aug. 01, 2024 USD ($) dealership center	Mar. 31, 2025 USD ($) franchise dealership	Mar. 31, 2024 USD ($) dealership center	Dec. 31, 2024 USD ($)
Business Acquisition
Goodwill		$ 2,076.5		$ 2,057.9
Asset impairments		1.5	$ 0.0
Disposed of by Sale
Business Acquisition
Dispositions reduced goodwill			$ 39.8
Held-for-sale
Business Acquisition
Goodwill		6.7		11.5
Intangible asset impairment				$ 4.8
Gain on disposition of intangible assets		$ 2.3
Inchcape plc’s
Business Acquisition
Number of dealerships acquired | dealership	54
Aggregate consideration paid for dealerships	$ 517.0
Goodwill	$ 121.7
Number of collision centers | center	3
U.K.
Business Acquisition
Number of dealerships acquired | dealership		4
Number of dealerships | dealership		2
Asset impairments		$ 2.7
U.K. | Toyota Dealerships
Business Acquisition
Number of dealerships acquired | dealership		3
U.K. | Lexus Dealership
Business Acquisition
Number of dealerships acquired | dealership		1
U.K. | 2025 Business Acquisitions
Business Acquisition
Aggregate consideration paid for dealerships		$ 16.4
Goodwill		2.4
U.S.
Business Acquisition
Number of dealerships acquired | dealership			9
Aggregate consideration paid for dealerships			$ 690.4
Goodwill			288.3
U.S. | Disposed of by Sale
Business Acquisition
Net pre-tax gain on dealership dispositions		$ 1.6	$ 30.9
Number of dealerships | dealership		1	6
Dispositions reduced goodwill		$ 4.6
Number of franchises | franchise		4
U.S. | Lexus Dealership
Business Acquisition
Number of dealerships acquired | dealership			2
U.S. | Inchcape plc’s
Business Acquisition
Number of collision centers | center			3
U.S. | Honda Dealership
Business Acquisition
Number of dealerships acquired | dealership			3
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. | Toyota Certified Pre-Owned Center
Business Acquisition
Number of certified pre-owned center | center			1

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