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ACQUISITIONS AND DISPOSITIONS (Details)	3 Months Ended		6 Months Ended
	Sep. 30, 2024 USD ($) dealership	Jun. 30, 2024 USD ($) dealership	Jun. 30, 2024 USD ($) dealership center	Jun. 30, 2023 USD ($) dealership franchise	Dec. 31, 2023 USD ($)
Disposed of by Sale
Acquisitions and Dispositions
Dispositions reduced goodwill | $			$ 62,500,000	$ 20,800,000
Held-for-sale
Acquisitions and Dispositions
Goodwill | $		$ 0	$ 0		$ 39,800,000
U.S.
Acquisitions and Dispositions
Number of dealerships acquired			9
Aggregate consideration | $			$ 690,400,000	363,500,000
Goodwill acquired | $			$ 287,500,000	43,900,000
U.S. | Disposed of by Sale
Acquisitions and Dispositions
Number of collision centers | center			1
Net pre-tax gain (loss) on dealership dispositions | $			$ 51,600,000	$ 10,100,000
Number of dealerships		7	7	4
Number of franchises | franchise				1
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. | Prime Automotive Group
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. | Assets of Inchcape Plc | Forecast
Acquisitions and Dispositions
Number of dealerships acquired	54
Cash paid | $	$ 439,000,000
Payments to acquire real estate | $	$ 279,000,000
U.K. | Mercedes-Benz Dealership
Acquisitions and Dispositions
Number of dealerships acquired		4
Cash paid | $		$ 86,400,000

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