v3.21.1
INVESTMENTS (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
item
Mar. 31, 2020
USD ($)
Investments    
Ownership percentage 49.00%  
Recorded equity in loss $ (2.8) $ (2.9)
Equity Method Investments Ownership Transactions [Abstract]    
Recorded equity in loss (2.8) (2.9)
Equity Method Investment, Nonconsolidated Investee(s)    
Investments    
Recorded equity in loss 2.8 2.9
Equity Method Investments Ownership Transactions [Abstract]    
Recorded equity in loss $ 2.8 $ 2.9
U.S.    
Investments    
Number of theatres with partnership interests | item 3  
Europe    
Investments    
Ownership percentage 50.00%  
Number of theatres with partnership interests | item 54  
DCM    
Investments    
Ownership percentage 50.00%  
SV Holdco    
Investments    
Ownership percentage 18.30%  
AC JV, LLC    
Investments    
Ownership percentage 32.00%  
DCIP    
Investments    
Ownership percentage 29.00%  
SCC    
Investments    
Ownership percentage 10.00%  
DCDC    
Investments    
Ownership percentage 14.60%  
Maximum    
Investments    
Ownership percentage 50.00%