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GOODWILL (Details) $ in Millions		3 Months Ended
GOODWILL (Details) $ in Millions	Sep. 14, 2018 USD ($) shares	Mar. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)
Goodwill [Roll Forward]
Balance at the beginning of the period		$ 4,789.1
Goodwill impairment		(1,744.3)
Currency translation adjustment		106.8
Balance at the end of the period		$ 2,938.0
Number of reporting units \| segment		2
Domestic theatres
Goodwill [Roll Forward]
Balance at the beginning of the period		$ 3,072.6
Goodwill impairment		(1,124.9)
Balance at the end of the period		1,947.7
International theatres
Goodwill [Roll Forward]
Balance at the beginning of the period		1,716.5
Goodwill impairment		(619.4)
Currency translation adjustment		106.8
Balance at the end of the period		990.3
Class B common stock
Goodwill [Roll Forward]
Common stock repurchased and cancellation (in shares) \| shares	24,057,143
2.95% Senior Unsecured Convertible Notes due 2024
Goodwill [Roll Forward]
Principal balance	$ 600.0	$ 600.0	$ 600.0