Business Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			3
Total assets	$ 1,769.9		$ 1,769.9		$ 1,790.7
Total long-lived assets	215.2		215.2		216.9
Total net sales to external customers	301.3	$ 295.9	580.5	$ 576.2
Operating earnings	19.6	24.8	27.0	40.1
Total capital expenditures	12.2	7.1	26.8	16.1
Total depreciation and amortization	16.0	17.8	32.2	35.2
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets	53.5		53.5		67.5
Total long-lived assets	4.3		4.3		3.9
Operating earnings	(18.3)	(7.7)	(26.9)	(16.2)
Total capital expenditures	0.4	0.3	0.7	1.0
Total depreciation and amortization	0.1	(0.1)	0.2	0.0
Advanced Plastic Processing Technologies [Member] | Segments [Member]
Segment Reporting Information [Line Items]
Total assets	476.0		476.0		460.9
Total long-lived assets	103.1		103.1		98.3
Total net sales to external customers	169.9	158.3	321.3	310.3
Operating earnings	13.2	7.2	24.0	18.0
Total capital expenditures	6.9	4.8	16.5	7.6
Total depreciation and amortization	5.1	5.5	10.4	11.0
Melt Delivery and Control Systems [Member] | Segments [Member]
Segment Reporting Information [Line Items]
Total assets	1,094.4		1,094.4		1,112.1
Total long-lived assets	92.2		92.2		97.6
Total net sales to external customers	101.8	105.2	201.2	201.8
Operating earnings	20.9	22.6	23.3	33.2
Total capital expenditures	4.8	1.9	9.3	7.2
Total depreciation and amortization	9.1	10.1	18.2	19.6
Fluid Technologies [Member] | Segments [Member]
Segment Reporting Information [Line Items]
Total assets	146.0		146.0		150.2
Total long-lived assets	15.6		15.6		$ 17.1
Total net sales to external customers	29.6	32.4	58.0	64.1
Operating earnings	3.8	2.7	6.6	5.1
Total capital expenditures	0.1	0.1	0.3	0.3
Total depreciation and amortization	$ 1.7	$ 2.3	$ 3.4	$ 4.6