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GOODWILL AND INTANGIBLE FRANCHISE RIGHTS - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended		216 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2019
Goodwill [Roll Forward]
Net, beginning balance	$ 2,009.0	$ 1,783.4
Reclassified from assets held for sale	29.6	0.9
Acquisitions	40.9	240.8
Divestitures	(30.1)	(0.9)
Impairments	(1.3)	(14.9)	$ (537.7)
Reclassified to assets held for sale	(3.5)	(0.3)
Net, ending balance	2,044.7	2,009.0
Dealerships
Goodwill [Roll Forward]
Net, beginning balance	1,472.4	1,246.8
Reclassified from assets held for sale	29.6	0.9
Acquisitions	40.9	240.8
Divestitures	(30.1)	(0.9)
Impairments	(1.3)	(14.9)
Reclassified to assets held for sale	(3.5)	(0.3)
Net, ending balance	1,508.1	1,472.4
TCA
Goodwill [Roll Forward]
Net, beginning balance	536.6	536.6
Reclassified from assets held for sale	0.0	0.0
Acquisitions	0.0	0.0
Divestitures	0.0	0.0
Impairments	0.0	0.0
Reclassified to assets held for sale	0.0	0.0
Net, ending balance	$ 536.6	$ 536.6

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