Goodwill and Other Intangible Assets - Goodwill, by Reportable Segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0	$ 0
Goodwill [Roll Forward]
Balance			513,200,000
Foreign currency translation adjustments			(10,700,000)
Balance	502,500,000		502,500,000
Corporate [Member]
Goodwill [Roll Forward]
Balance			0
Foreign currency translation adjustments			0
Balance	0		0
Advanced Plastic Processing Technologies | Segments [Member]
Goodwill [Roll Forward]
Balance			35,000,000.0
Foreign currency translation adjustments			0
Balance	35,000,000.0		35,000,000.0
Melt Delivery and Control Systems | Segments [Member]
Goodwill [Roll Forward]
Balance			431,300,000
Foreign currency translation adjustments			(10,700,000)
Balance	420,600,000		420,600,000
Fluid Technologies | Segments [Member]
Goodwill [Roll Forward]
Balance			46,900,000
Foreign currency translation adjustments			0
Balance	$ 46,900,000		$ 46,900,000