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Retirement Plans (Summary of Net Pension and Supplemental Executive Retirement Plan Expense Recognized) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Retirement Benefits [Abstract]    
Service cost pertaining to benefits earned during the period $ 1.6 $ 1.4
Interest cost on projected benefit obligations 3.5 3.8
Expected return on pension assets (4.6) (4.4)
Net amortization loss 1.6 0.6
Net pension expense $ 2.1 $ 1.4