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Retirement Plans (Summary of Net Pension and Supplemental Executive Retirement Plan Expense Recognized) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Retirement Benefits [Abstract]        
Service cost pertaining to benefits earned during the period $ 1.5 $ 1.8 $ 4.6 $ 5.4
Interest cost on projected benefit obligations 4.1 4.5 12.4 13.3
Expected return on pension assets (5.4) (5.0) (15.5) (14.8)
Net amortization loss 0.8 2.4 2.5 7.3
Net pension expense $ 1.0 $ 3.7 $ 4.0 $ 11.2