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Retirement Plans (Summary of Net Pension and Supplemental Executive Retirement Plan Expense Recognized) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Retirement Benefits [Abstract]        
Service cost pertaining to benefits earned during the period $ 1.6 $ 1.4 $ 3.2 $ 2.8
Interest cost on projected benefit obligations 3.6 3.8 7.1 7.6
Expected return on pension assets (4.7) (4.5) (9.3) (8.9)
Net amortization loss 1.7 0.7 3.3 1.3
Net pension expense $ 2.2 $ 1.4 $ 4.3 $ 2.8