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GOODWILL AND FRANCHISE VALUE - Schedule of Franchise Value (Details) - Franchise Rights - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Indefinite-lived Intangible Assets [Roll Forward]
Balance as of beginning of period	$ 2,550.3	$ 2,402.2
Additions through acquisitions	192.0	172.5
Reductions through divestitures	(5.0)	(9.5)
Currency translation	5.1	(14.9)
Balance as of end of period	2,742.4	2,550.3
2023 Acquisition
Indefinite-lived Intangible Assets [Roll Forward]
Additions through acquisitions		$ 172.5
2024 Acquisition
Indefinite-lived Intangible Assets [Roll Forward]
Additions through acquisitions	$ 192.0

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

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