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Summary of Significant Accounting Policies (Internal Use Software Development Costs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Internal Use Software Development Costs [Line Items]      
Capitalized internal use software development costs, net $ 59.9 $ 39.4  
Software Development [Member]      
Internal Use Software Development Costs [Line Items]      
Amortization $ 6.1 $ 5.8 $ 5.4