Leases (Components of Lease Expense) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 28, 2019	Jun. 28, 2019
Leases [Abstract]
Fixed operating lease expense	$ 56.0	$ 119.4
Variable operating lease expense	12.9	24.9
Total operating lease expense	$ 68.9	$ 144.3