Leases Operating Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Leases [Abstract]
Operating Lease, Expense	$ 7.9	$ 8.1	$ 24.2	$ 24.3
Variable Lease, Cost	3.0	3.6	9.1	10.9
Short-term Lease, Cost	0.3	0.3	0.8	0.9
Sublease Income	(1.2)	(1.0)	(3.5)	(2.9)
Lease, Cost	$ 10.0	$ 11.0	$ 30.6	$ 33.2