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Revenue from Contracts with Customers (Summary of Revenue from Contracts with Customers) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 24, 2020
Sep. 26, 2019
Sep. 24, 2020
Sep. 26, 2019
Disaggregation of Revenue [Line Items]        
Revenue $ 6.0 $ 110.5 $ 74.7 $ 297.6
National and Regional Advertising Revenue [Member] [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 3.5 86.4 55.0 228.1
Local advertising revenue        
Disaggregation of Revenue [Line Items]        
Revenue 2.3 16.8 14.0 47.3
Founding member advertising revenue from beverage concessionaire agreements        
Disaggregation of Revenue [Line Items]        
Revenue $ 0.2 $ 7.3 $ 5.7 $ 22.2