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ACQUISITIONS AND DIVESTITURES - Narrative (Details) $ in Millions		1 Months Ended	3 Months Ended						9 Months Ended
	Dec. 11, 2023 USD ($) newVehicleDealership collisionCenter	Dec. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2024 USD ($) acquisition dealership franchise	Sep. 30, 2023 USD ($) franchise dealership acquisition
Business Acquisition [Line Items]
Goodwill		$ 2,009.0	$ 2,011.3						$ 2,011.3
Revenue			4,236.7			$ 3,666.2			12,684.1	$ 10,991.0
Net income			126.3	$ 28.1	$ 147.1	169.2	$ 196.4	$ 181.4	$ 301.5	$ 547.0
Number of businesses acquired | acquisition									0	0
Gain on divestitures			$ 5.0			$ 0.0			$ 8.6	$ 13.5
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
Business Acquisition [Line Items]
Number of dealership locations, sold (in dealership locations) | dealership									1
Disposed of by sale | Colorado | Nissan Franchise
Business Acquisition [Line Items]
Number of franchises, sold (in franchises) | franchise									1
Disposed of by sale | Georgia
Business Acquisition [Line Items]
Number of dealership locations, sold (in dealership locations) | dealership									1
Disposed of by sale | Georgia | Nissan Franchise
Business Acquisition [Line Items]
Number of franchises, sold (in franchises) | franchise									1
Disposed of by sale | Georgia | Chevrolet Franchise
Business Acquisition [Line Items]
Number of franchises, sold (in franchises) | franchise									1
Disposed of by sale | Texas
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 | Washington
Business Acquisition [Line Items]
Number of dealership locations, sold (in dealership locations) | dealership									1
Disposed of by sale | Washington | Honda Franchise
Business Acquisition [Line Items]
Number of franchises, sold (in franchises) | franchise									1
Jim Koons Dealerships
Business Acquisition [Line Items]
Number of new vehicle dealerships acquired | newVehicleDealership	20
Number of collision centers acquired (in collision repair centers) | collisionCenter	6
Aggregate purchase price	$ 1,504.5
Intangible franchise rights	430.3
Goodwill	239.9
Revenue		2,110.1
Net income		$ 67.9
Jim Koons Dealerships | Disposed of by sale
Business Acquisition [Line Items]
Aggregate purchase price	$ 100.9

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