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Revenue from Contracts with Customers (Summary of Changes in Deferred Revenue) (Details)
$ in Millions
6 Months Ended
Jun. 25, 2020
USD ($)
Contract Liabilities  
Balance at beginning of period $ (7.6)
Performance obligations satisfied 5.4
New contract liabilities (5.5)
Balance at end of period (7.7)
National and regional advertising revenue  
Balance at beginning of period 1.1
Provision for bad debt (0.6)
Write-offs, net (0.1)
Balance at end of period 0.4
Local And Regional Advertising Revenue [Member]  
Balance at beginning of period 1.9
Provision for bad debt 1.3
Write-offs, net (0.4)
Balance at end of period $ 2.8