Leases - Lease Expense (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 30, 2019	Mar. 31, 2018
Leases [Abstract]
Operating leases	[1]	$ 12.0
Finance leases
Amortization		0.7
Interest		0.1
Total		$ 0.8
Operating lease expense			$ 11.9

[1] (a) Includes short-term leases and variable lease costs, which are immaterial.