Leases - Lease Expense (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Leases [Abstract]
Operating leases	[1]	$ 10.6	$ 11.0	$ 32.1	$ 33.9
Finance leases
Amortization		1.2	0.9	3.4	2.3
Interest		0.2	0.2	0.6	0.4
Total finance leases		$ 1.4	$ 1.1	$ 4.0	$ 2.7

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