Retirement Plans (Summary of Net Pension and Supplemental Executive Retirement Plan Expense Recognized) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Retirement Benefits [Abstract]
Service cost pertaining to benefits earned during the period	$ 1.4	$ 1.5	$ 2.8	$ 3.1
Interest cost on projected benefit obligations	3.8	4.2	7.6	8.3
Expected return on pension assets	(4.5)	(5.1)	(8.9)	(10.1)
Net amortization loss	0.7	0.9	1.3	1.7
Net pension expense	$ 1.4	$ 1.5	2.8	3.0
Pension contribution			$ 0.0	$ 20.7