Pension Plans - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jun. 26, 2020	Jul. 02, 2021	Jun. 26, 2020
U.S. Pension Benefits:
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0.2	$ 0.3	$ 0.4	$ 0.6
Expected return on plan assets	(0.2)	(0.3)	(0.4)	(0.6)
Net periodic pension cost	0.0	0.0	0.0	0.0
Non-U.S. Pension Benefits:
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.8	1.0	1.6	2.0
Service cost	1.0	1.1	2.0	2.2
Expected return on plan assets	(1.3)	(1.3)	(2.6)	(2.6)
Amortization of net loss	1.0	1.0	2.2	2.0
Amortization of prior service cost	0.1	0.1	0.2	0.2
Net periodic pension cost	$ 1.6	$ 1.9	$ 3.4	$ 3.8