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GOODWILL AND FRANCHISE VALUE - Schedule of Goodwill (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance	$ 1,930.6	$ 1,460.7
Adjustments to purchase price allocations	47.6
Additions through acquisitions	142.7	519.1
Reductions through divestitures	(0.4)	(51.1)
Currency translation	(2.4)	1.9
Ending balance	2,118.1	1,930.6
2022 Acquisition
Goodwill [Roll Forward]
Adjustments to purchase price allocations		285.9
2023 Acquisition
Goodwill [Roll Forward]
Adjustments to purchase price allocations	47.6	233.2
Additions through acquisitions	142.7
Vehicle Operations
Goodwill [Roll Forward]
Beginning balance	1,913.0	1,443.5
Adjustments to purchase price allocations	47.6
Additions through acquisitions	142.7	519.1
Reductions through divestitures	(0.4)	(51.1)
Currency translation	(1.8)	1.5
Ending balance	2,101.1	1,913.0
Financing Operations
Goodwill [Roll Forward]
Beginning balance	17.6	17.2
Adjustments to purchase price allocations	0.0
Additions through acquisitions	0.0	0.0
Reductions through divestitures	0.0	0.0
Currency translation	(0.6)	0.4
Ending balance	$ 17.0	$ 17.6

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