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Multipemployer Pension and Postretirement Plans Multiemployer Pension Plans Curtailments, Settlements and Termination Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Multiemployer Plan, Contributions by Employer $ 8.7 $ 10.4 $ 15.9
Multiemployer Plans, Postretirement Benefit      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Multiemployer Plan, Contributions by Employer $ 11.0 $ 11.0 $ 16.0