Business Segment Information - Business Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total assets	$ 1,731.5		$ 1,731.5		$ 1,696.3
Total long-lived assets	223.3		223.3		221.8
Total net sales to external customers	292.2	$ 292.7	877.6	$ 873.2
Total operating earnings	29.1	11.0	96.8	38.0
Total capital expenditures	10.1	12.9	31.0	39.7
Total depreciation and amortization	15.0	14.8	44.8	47.0
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets	43.6		43.6		24.2
Total long-lived assets	5.4		5.4		6.1
Total operating earnings	(6.7)	(17.8)	(25.9)	(44.7)
Total capital expenditures	0.0	1.0	0.0	1.7
Total depreciation and amortization	0.2	0.1	0.6	0.3
Advanced Plastic Processing Technologies [Member] | Segments [Member]
Segment Reporting Information [Line Items]
Total assets	500.6		500.6		501.1
Total long-lived assets	108.1		108.1		110.0
Total net sales to external customers	168.7	170.8	503.8	496.0
Total operating earnings	11.2	16.1	36.5	39.3
Total capital expenditures	4.7	5.8	16.8	22.3
Total depreciation and amortization	5.0	4.5	15.0	14.9
Melt Delivery and Control Systems [Member] | Segments [Member]
Segment Reporting Information [Line Items]
Total assets	1,040.4		1,040.4		1,029.3
Total long-lived assets	94.3		94.3		90.3
Total net sales to external customers	95.4	92.0	288.9	289.3
Total operating earnings	20.5	10.0	73.0	34.1
Total capital expenditures	5.0	5.9	13.4	15.2
Total depreciation and amortization	8.4	8.6	25.1	26.8
Fluid Technologies [Member] | Segments [Member]
Segment Reporting Information [Line Items]
Total assets	146.9		146.9		141.7
Total long-lived assets	15.5		15.5		$ 15.4
Total net sales to external customers	28.1	29.9	84.9	87.9
Total operating earnings	4.1	2.7	13.2	9.3
Total capital expenditures	0.4	0.2	0.8	0.5
Total depreciation and amortization	$ 1.4	$ 1.6	$ 4.1	$ 5.0