Pension Plans Narrative (Details) - Foreign Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Apr. 01, 2016	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.0	$ 0.8
Interest cost	1.4	1.9
Expected return on plan assets	(1.8)	(2.0)
Amortization of net loss	1.1	1.3
Net periodic pension cost	$ 1.7	$ 2.0
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contributions			$ 10.0