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Intangible Assets (Narrative) (Details) - NCM, LLC. - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 24, 2020
Mar. 26, 2020
Sep. 26, 2019
Mar. 28, 2019
Sep. 24, 2020
Sep. 26, 2019
Finite-Lived Intangible Assets [Line Items]            
Common membership units issued, net of returned   3,022,959   1,044,665    
Increase (decrease) in intangible assets, net   $ 10.5   $ 7.6    
AMC and Cinemark            
Finite-Lived Intangible Assets [Line Items]            
Increase (decrease) in intangible assets, net $ 0.0   $ 5.6   $ 1.4 $ 13.7
Integration and other encumbered payments, related parties - financing activities $ 0.0   $ 5.7   $ 9.7 $ 16.3
Minimum            
Finite-Lived Intangible Assets [Line Items]            
Percentage increase (decrease) in theater attendance for Common Unit adjustment to occur (2.00%)          
Maximum            
Finite-Lived Intangible Assets [Line Items]            
Percentage increase (decrease) in theater attendance for Common Unit adjustment to occur 2.00%