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Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($)
$ in Millions
Sep. 25, 2020
Dec. 27, 2019
Property, Plant and Equipment    
Property, plant and equipment, gross $ 1,901.2 $ 1,900.1
Less: accumulated depreciation (1,049.8) (1,003.6)
Property, plant and equipment, net $ 851.4 $ 896.5