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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. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Retirement Benefits [Abstract]        
Service cost pertaining to benefits earned during the period $ 1.5 $ 1.8 $ 3.1 $ 3.6
Interest cost on projected benefit obligations 4.2 4.4 8.3 8.8
Expected return on pension assets (5.1) (4.9) (10.1) (9.8)
Net amortization loss 0.9 2.5 1.7 4.9
Net pension expense $ 1.5 $ 3.8 $ 3.0 $ 7.5