Leases - Lease Expense (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Leases [Abstract]
Operating leases	[1]	$ 11.0		$ 33.9
Finance leases
Amortization		0.9		2.3
Interest		0.2		0.4
Total finance leases		$ 1.1		$ 2.7
Operating lease expense			$ 12.4		$ 38.5

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