Retirement Plans (Summary of Net Pension and Supplemental Executive Retirement Plan Expense Recognized) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Retirement Benefits [Abstract]
Service cost pertaining to benefits earned during the period	$ 1.3	$ 1.5	$ 4.1	$ 4.6
Interest cost on projected benefit obligations	3.8	4.1	11.4	12.4
Expected return on pension assets	(4.4)	(5.4)	(13.3)	(15.5)
Net amortization loss	0.7	0.8	2.0	2.5
Net pension expense	$ 1.4	$ 1.0	4.2	4.0
Pension contribution			$ 0.0	$ 60.7