v3.19.3.a.u2
INVESTMENTS (Details)
1 Months Ended 12 Months Ended
Mar. 14, 2019
$ / shares
shares
Jul. 02, 2018
USD ($)
Jun. 18, 2018
USD ($)
agreement
$ / shares
shares
Dec. 29, 2017
USD ($)
Jun. 30, 2017
USD ($)
$ / shares
Dec. 26, 2013
USD ($)
item
Mar. 31, 2019
shares
Mar. 31, 2018
shares
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
shares
Mar. 15, 2018
$ / shares
Investments                        
Number of theatres | item                 4      
Equity Method Investments Ownership Transactions [Abstract]                        
Number of shares issued | shares                     616,800,000  
Investment expense (income)       $ 3,500,000 $ 204,500,000       $ 3,600,000      
Price per share (in dollars per share) | $ / shares         $ 7.42         $ 6.86    
Distribution and merger consideration received   $ 45,800,000                    
Recorded equity in earnings                 30,600,000 $ 86,700,000 $ (185,200,000)  
Amortizable intangible asset                 $ 52,500,000 $ 258,500,000    
Europe                        
Investments                        
Ownership percentage                 50.00%      
Number of theatres | item                 55      
5.0% Promissory Note payable to NCM due 2019                        
Equity Method Investments Ownership Transactions [Abstract]                        
Stated interest rate (as a percent)                 5.00% 5.00%    
U.S. theatres and IMAX screen                        
Investments                        
Amounts due to affiliate                 $ 1,000,000.0 $ 900,000    
Open Road Releasing, LLC, operator of ORF                        
Investments                        
Ownership percentage                 50.00%      
Equity Method Investments Ownership Transactions [Abstract]                        
Gain (loss) on sale                 $ 17,200,000      
Loss NCM charged to merger, acquisition and transaction costs                 17,200,000      
NCM                        
Investments                        
Ownership percentage     4.50%     4.00%            
Common units returned under Common Unit Adjustment Agreement | shares             197,118 915,150        
Value of common units returned under Unit Adjustment agreement | shares 1,400,000                      
Surrender of common units for make whole agreement                     23,100,000  
Equity Method Investments Ownership Transactions [Abstract]                        
Gain on divestment of equity method investment                   30,600,000 (22,600,000)  
Gain (loss) on sale                   28,900,000 (22,200,000)  
Investment expense (income)                 16,000,000.0 208,000,000.0    
Price per share (in dollars per share) | $ / shares $ 7.24   $ 7.30                 $ 5.64
Number of unit purchase agreements | agreement     2                  
Number of investment units sold | shares     10,738,740                  
Aggregate consideration     $ 156,800,000                  
Recorded equity in earnings                 28,900,000      
Loss NCM charged to merger, acquisition and transaction costs                   28,900,000 (22,200,000)  
All Investees Except Those Specifically Excluded [Member]                        
Investments                        
Excess of recorded investment over proportional ownership of underlying equity                 $ (36,600,000)      
DCM                        
Investments                        
Ownership percentage                 50.00%      
SV Holdco                        
Investments                        
Ownership percentage                 18.20%      
SV Holdco | Class C Units                        
Investments                        
Ownership percentage                 18.20%      
AC JV, LLC                        
Investments                        
Ownership percentage                 32.00%      
AC JV, LLC | Founding Members                        
Investments                        
Ownership percentage           32.00%            
Consideration received for spin-off           $ 25,000,000.0            
AC JV, LLC | Founding Members | 5.0% Promissory Note payable to NCM due 2019                        
Investments                        
Consideration received for spin-off from each founder member           $ 8,300,000            
Number of equal installments of interest and principal payments due | item           6            
Equity Method Investments Ownership Transactions [Abstract]                        
Stated interest rate (as a percent)           5.00%            
DCIP                        
Investments                        
Ownership percentage                 29.00%      
Equity Method Investments Ownership Transactions [Abstract]                        
Recorded equity in earnings                 $ 25,400,000 29,100,000 28,600,000  
SSC                        
Investments                        
Ownership percentage                 10.00%      
Other                        
Equity Method Investments Ownership Transactions [Abstract]                        
Recorded equity in earnings                 $ 5,200,000 $ 39,700,000 $ 2,500,000  
U.S. theatres and IMAX screen                        
Investments                        
Ownership percentage                 50.00%      
Number of theatres | item                 4      
DCDC                        
Investments                        
Ownership percentage                 14.60%      
Screenvision                        
Investments                        
Ownership percentage                 18.20%      
Equity Method Investments Ownership Transactions [Abstract]                        
Gain (loss) on sale                 $ 30,100,000      
Carrying value of screenvision investment                 0      
Recorded equity in earnings                 30,100,000      
Loss NCM charged to merger, acquisition and transaction costs                 $ 30,100,000      
Minimum | NCM                        
Equity Method Investments Ownership Transactions [Abstract]                        
Percentage change in the total annual attendance of all the founding members required to cause an earlier common unit adjustment                 2.00%      
Maximum                        
Investments                        
Ownership percentage                 50.00%