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GOODWILL AND INTANGIBLE FRANCHISE RIGHTS - Narrative (Details) $ in Millions		3 Months Ended		12 Months Ended
	Dec. 11, 2023 USD ($) collisionCenter	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 17, 2021 USD ($)
Business Acquisition [Line Items]
Goodwill acquired				$ 40.9	$ 240.8
Goodwill		$ 2,044.7		2,044.7	2,009.0	$ 1,783.4
Asset impairments				149.5	117.2	$ 0.0
Franchise rights
Business Acquisition [Line Items]
Intangible assets acquired				26.7	429.0
Goodwill and intangible asset impairment				117.2
Asset impairments		$ 14.1	$ 134.1	148.2	$ 102.3
Non-cash, impairment of intangible assets, finite-lived, pre-tax				$ 73.1
LHM Acquisition
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets							$ 5.6
Jim Koons Dealerships
Business Acquisition [Line Items]
Number of new vehicle dealerships acquired (in new vehicle dealerships) | collisionCenter	20
Number of collision centers acquired (in collision centers) | collisionCenter	6
Aggregate purchase price	$ 1,504.5
Goodwill	272.4
Intangible franchise rights	$ 401.0

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