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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. 30, 2019
Mar. 31, 2018
Retirement Benefits [Abstract]    
Service cost pertaining to benefits earned during the period $ 1.4 $ 1.6
Interest cost on projected benefit obligations 3.8 4.1
Expected return on pension assets (4.4) (5.0)
Net amortization loss 0.6 0.8
Net pension expense 1.4 1.5
Pension contribution $ 0.0 $ 0.3