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Summary of Significant Accounting Policies (Advertising Costs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Other restaurant operating [Member]      
Schedule of Advertising Costs [Line Items]      
Advertising expense $ 146.1 $ 147.8 $ 151.4