v3.21.1
BASIS OF PRESENTATION - Baltics' Theatre sale agreement (Details)
€ in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Aug. 28, 2020
USD ($)
item
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Aug. 28, 2020
EUR (€)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Equity Method Investment, Ownership Percentage   49.00%   49.00%    
Stockholders' Equity Attributable to Noncontrolling Interest   $ 22.4 $ 26.9      
Forum Cinemas OU [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Equity Method Investment, Ownership Percentage 49.00%         49.00%
Stockholders' Equity Attributable to Noncontrolling Interest   $ 22.4        
Noncontrolling interest, ownership percentage   49        
Forum Cinemas OU [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of Theatres | item 9          
Gross consideration | €           € 77,250
Cash $ 76.6         64,350
Net Consideration 37.5         € 31,530
Transaction costs   $ 0.1 1.4      
Net gain (loss) on disposal   0.3 $ 1.2      
Goodwill, net   36.3        
Property net   9.1        
Operating lease right-of-use assets, net   12.4        
Operating lease liability, current   1.2        
Long term lease liability   $ 11.4        
Equity Method Investment, Ownership Percentage   51.00%   51.00%    
Stockholders' Equity Attributable to Noncontrolling Interest $ 34.9          
Forum Cinemas OU [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Lithuania and Estonia            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net Consideration   $ 31.9   € 26,300    
Equity Method Investment, Ownership Percentage     49.00%   49.00%  
Forum Cinemas OU [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Estonia and Latvia            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net Consideration   $ 4.1 $ 6.4 € 3,400 € 5,400  
Forum Cinemas OU [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Latvia            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Equity Method Investment, Ownership Percentage     100.00%   100.00%  
Consolidated Subsidiaries | Forum Cinemas OU [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   51.00%   51.00%