Pension Plans Narrative (Details) - Foreign Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.1	$ 0.9	$ 3.1	$ 2.6
Interest cost	1.5	1.8	4.4	5.6
Expected return on plan assets	(1.9)	(2.0)	(5.5)	(6.1)
Amortization of net loss	1.2	1.3	3.4	4.1
Net periodic pension cost	$ 1.9	$ 2.0	$ 5.4	$ 6.2
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contributions					$ 10.0