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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Balance at the beginning of the period			$ 4,789.1	$ 2,547.3	$ 4,789.1
Goodwill impairment adjustment	$ (405.3)	$ (156.8)	(1,744.3)		(2,306.4)
Baltics disposition					(7.9)
Currency translation adjustment				(76.2)	72.5
Balance at the end of the period	2,547.3			2,429.8	2,547.3
Domestic theatres
Goodwill [Roll Forward]
Goodwill impairment adjustment					(1,276.1)
International theatres
Goodwill [Roll Forward]
Goodwill impairment adjustment					(1,030.3)
U.S.
Goodwill [Roll Forward]
Balance at the beginning of the period			3,072.6	1,796.5	3,072.6
Goodwill impairment adjustment		(151.2)	(1,124.9)
Balance at the end of the period	1,796.5			1,796.5	1,796.5
International markets
Goodwill [Roll Forward]
Balance at the beginning of the period			1,716.5	750.8	1,716.5
Goodwill impairment adjustment	(405.3)	$ (5.6)	$ (619.4)
Baltics disposition					(7.9)
Currency translation adjustment				(76.2)	72.5
Balance at the end of the period	$ 750.8			633.3	$ 750.8
Estonia
Goodwill [Roll Forward]
Baltics disposition				(3.7)
Lithuania
Goodwill [Roll Forward]
Baltics disposition				$ (37.6)