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	$ 58.7	$ 178.1
Variable operating lease expense	13.4	38.3
Total operating lease expense	$ 72.1	$ 216.4