Retirement Plans (Summary of Net Pension and Supplemental Executive Retirement Plan Expense Recognized) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Retirement Benefits [Abstract]
Service cost pertaining to benefits earned during the period	$ 1.7	$ 1.6	$ 3.5	$ 3.2
Interest cost on projected benefit obligations	3.2	3.6	6.4	7.1
Expected return on pension assets	(4.9)	(4.7)	(9.8)	(9.3)
Net amortization loss	3.5	1.7	6.9	3.3
Net pension expense	$ 3.5	$ 2.2	$ 7.0	$ 4.3