Leases (Components of Lease Expense) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 27, 2019	Sep. 27, 2019
Leases [Abstract]
Fixed operating lease expense	$ 10.7	$ 29.7
Variable operating lease expense	1.5	4.4
Total operating lease expense	$ 12.2	$ 34.1