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Retirement Plans (Schedule of Expected Benefit Payments) (Details)
$ in Millions
Dec. 27, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Fiscal 2020 $ 1.8
Fiscal 2021 1.7
Fiscal 2022 1.6
Fiscal 2023 1.6
Fiscal 2024 1.6
Fiscal 2025 - 2029 7.2
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Fiscal 2020 3.4
Fiscal 2021 3.2
Fiscal 2022 3.0
Fiscal 2023 2.9
Fiscal 2024 2.8
Fiscal 2025 - 2029 $ 12.6