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ACQUISITIONS AND DIVESTITURES - Narrative (Details) $ in Millions		3 Months Ended
	Feb. 14, 2025 USD ($) franchise dealership collisionCenter	Mar. 31, 2025 USD ($) dealership business franchise	Mar. 31, 2024 USD ($) franchise dealership business	Dec. 31, 2024 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 1,976.2		$ 2,044.7
Number of businesses acquired | business		0	0
Gain on divestitures, net		$ 4.1	$ 0.0
Disposed of by sale | Delaware
Business Acquisition [Line Items]
Number of dealership locations, sold (in dealership locations) | dealership			1
Disposed of by sale | Delaware | Lexus Franchise
Business Acquisition [Line Items]
Number of franchises, sold (in franchises) | franchise			1
Disposed of by sale | Colorado | Nissan Franchise
Business Acquisition [Line Items]
Number of franchises, sold (in franchises) | franchise		1
Number of dealership locations, sold (in dealership locations) | dealership		1
Disposed of by sale | SOUTH CAROLINA | Volvo Franchise
Business Acquisition [Line Items]
Number of franchises, sold (in franchises) | franchise		1
Number of dealership locations, sold (in dealership locations) | dealership		1
Herb Chambers Dealerships
Business Acquisition [Line Items]
Consideration to be transferred	$ 1,340.0
Goodwill	750.0
Real estate and leasehold improvements to be acquired	$ 590.0
Dealerships to be acquired | dealership	33
Franchises to be acquired | franchise	52
Collision centers to be acquired | collisionCenter	3
Put right obligation, period following closing	5 years

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