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Commitments and Contingencies (Details) - USD ($)
$ in Millions
Sep. 26, 2020
Dec. 28, 2019
Sep. 28, 2019
Commitments and Contingencies Disclosure [Abstract]      
Purchase Obligation, Due Second Year $ 0.0    
Letters of Credit Outstanding, Amount $ 50.4 $ 32.0 $ 34.0