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ACQUISITIONS - Other Acquisitions and Dispositions (Details) $ in Millions		3 Months Ended	9 Months Ended
	Aug. 01, 2024 USD ($) dealership center	Sep. 30, 2024 USD ($) dealership	Sep. 30, 2024 USD ($) dealership center	Sep. 30, 2023 USD ($) dealership franchise	Dec. 31, 2023 USD ($)
Disposed of by Sale
Acquisitions and Dispositions
Dispositions reduced goodwill | $			$ 66.4	$ 44.7
Held-for-sale
Acquisitions and Dispositions
Goodwill | $		$ 9.8	$ 9.8		$ 39.8
Inchcape plc’s
Acquisitions and Dispositions
Number of dealerships acquired	54
Number of collision centers | center	3
Aggregate consideration | $	$ 517.0
U.S.
Acquisitions and Dispositions
Number of dealerships acquired			9
Aggregate consideration | $			$ 690.4	363.4
Goodwill acquired | $			$ 287.8	58.8
U.S. | Disposed of by Sale
Acquisitions and Dispositions
Number of collision centers | center			1
Net pre-tax gain (loss) on dealership dispositions | $			$ 52.9	$ 18.1
Number of dealerships		8	8	9
Number of franchises | franchise				2
U.S. | Honda Dealership
Acquisitions and Dispositions
Number of dealerships acquired			3
U.S. | Lexus Dealership
Acquisitions and Dispositions
Number of dealerships acquired			2
U.S. | Toyota Dealership
Acquisitions and Dispositions
Number of dealerships acquired			1
U.S. | Kia Dealership
Acquisitions and Dispositions
Number of dealerships acquired			1	1
U.S. | Hyundai Dealership
Acquisitions and Dispositions
Number of dealerships acquired			1
U.S. | Mercedes-Benz Dealership
Acquisitions and Dispositions
Number of dealerships acquired			1
U.S. | Toyota Certified Pre-Qwned Center
Acquisitions and Dispositions
Number of certified pre-owned center | center			1
U.S. | Inchcape plc’s
Acquisitions and Dispositions
Number of collision centers | center			3
U.S. | Chevrolet Dealership
Acquisitions and Dispositions
Number of dealerships acquired				1
U.S. | Buick-GMC Dealerships
Acquisitions and Dispositions
Number of dealerships acquired				3
U.K. | BMW/MINI Dealership
Acquisitions and Dispositions
Cash paid | $		$ 32.1
U.K. | Mercedes-Benz Dealership
Acquisitions and Dispositions
Number of dealerships acquired			4
Aggregate consideration | $			$ 86.3
Goodwill acquired | $			$ 34.3

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