Pension Plans Components of Net Periodic Pension Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0.3	$ 0.0	$ 0.6	$ 0.0
Expected return on plan assets	(0.3)	0.0	(0.7)	0.0
Net periodic pension cost	0.0	0.0	(0.1)	0.0
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.4	1.0	0.9	2.0
Interest cost	1.5	1.5	3.0	2.9
Expected return on plan assets	(1.8)	(1.8)	(3.7)	(3.6)
Amortization of net loss	0.9	1.1	1.8	2.2
Net curtailment and settlement loss recognized	0.6	0.0	0.6	0.0
Net periodic pension cost	$ 1.6	$ 1.8	$ 2.6	$ 3.5