v3.20.4
GOODWILL AND INTANGIBLE ASSETS (Details)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Sep. 14, 2018
USD ($)
Goodwill [Roll Forward]              
Balance at the beginning of the period       $ 4,789.1 $ 4,789.1 $ 4,788.7  
Goodwill impairment adjustment $ 0.0 $ (405.3) $ (156.8) (1,744.3) (2,306.4)    
Baltics disposition-Latvia         (7.9)    
Currency translation adjustment         72.5 0.4  
Balance at the end of the period   2,547.3     $ 2,547.3 4,789.1  
Number of reporting units | item         2    
Domestic theatres              
Goodwill [Roll Forward]              
Goodwill impairment adjustment         $ (1,276.1)    
International theatres              
Goodwill [Roll Forward]              
Goodwill impairment adjustment         (1,030.3)    
2.95% Senior Secured Convertible Notes due 2024              
Goodwill [Roll Forward]              
Principal balance   600.0     600.0   $ 600.0
U.S.              
Goodwill [Roll Forward]              
Balance at the beginning of the period       3,072.6 3,072.6 3,072.6  
Goodwill impairment adjustment     (151.2) (1,124.9) (405.3)    
Balance at the end of the period   1,796.5     1,796.5 3,072.6  
Percentage the reporting unit's carrying value exceeds its fair value 9.90%            
International markets              
Goodwill [Roll Forward]              
Balance at the beginning of the period       1,716.5 1,716.5 1,716.1  
Goodwill impairment adjustment   (405.3) $ (5.6) $ (619.4)      
Baltics disposition-Latvia         (7.9)    
Currency translation adjustment         72.5 0.4  
Balance at the end of the period   $ 750.8     $ 750.8 $ 1,716.5  
Percentage the reporting unit's carrying value exceeds its fair value 11.80%