Retirement Plans (Summary of Net Pension and Supplemental Executive Retirement Plan Expense Recognized) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Retirement Benefits [Abstract]
Service cost pertaining to benefits earned during the period	$ 1.7	$ 1.6	$ 5.2	$ 4.8
Interest cost on projected benefit obligations	3.2	3.6	9.6	10.7
Expected return on pension assets	(4.8)	(4.7)	(14.6)	(14.0)
Net amortization loss	3.4	1.6	10.3	4.9
Net pension expense	$ 3.5	$ 2.1	$ 10.5	$ 6.4