Business Segment Information - Business Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 1,714.2		$ 1,722.0
Total long-lived assets	249.8		243.7
Total net sales to external customers	285.4	$ 277.3
Total operating earnings	19.7	32.0
Total capital expenditures	12.7	8.0
Total depreciation and amortization	14.5	14.8
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets	29.1		73.6
Total long-lived assets	5.8		6.1
Total operating earnings	(12.5)	(10.1)
Total capital expenditures	0.1	0.6
Total depreciation and amortization	0.3	0.1
Advanced Plastic Processing Technologies [Member] | Segments [Member]
Segment Reporting Information [Line Items]
Total assets	515.6		503.0
Total long-lived assets	126.2		121.4
Total net sales to external customers	156.6	156.1
Total operating earnings	2.1	9.8
Total capital expenditures	5.9	5.6
Total depreciation and amortization	4.8	5.1
Melt Delivery and Control Systems [Member] | Segments [Member]
Segment Reporting Information [Line Items]
Total assets	1,026.4		1,003.8
Total long-lived assets	102.3		101.0
Total net sales to external customers	99.8	93.0
Total operating earnings	25.5	28.2
Total capital expenditures	6.6	1.7
Total depreciation and amortization	8.2	8.2
Fluid Technologies [Member] | Segments [Member]
Segment Reporting Information [Line Items]
Total assets	143.1		141.6
Total long-lived assets	15.5		$ 15.2
Total net sales to external customers	29.0	28.2
Total operating earnings	4.6	4.1
Total capital expenditures	0.1	0.1
Total depreciation and amortization	$ 1.2	$ 1.4