Business Segment Information - Business Segment Information (Details) € in Millions, $ in Millions			3 Months Ended		9 Months Ended
	Jan. 31, 2019 USD ($)	Jan. 31, 2019 EUR (€)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Total assets			$ 1,643.6		$ 1,643.6		$ 1,732.5
Total long-lived assets including right of use assets, net			241.0		241.0
Total long-lived assets, net			202.3		202.3		215.7
Net sales			250.3	$ 282.8	770.4	$ 875.2
Total operating earnings			19.3	31.9	69.0	90.8
Total capital expenditures	$ 7.8	€ 6.8	6.5	9.2	31.4	25.0
Total depreciation and amortization			11.6	12.4	35.3	39.0
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets			59.9		59.9		74.3
Total long-lived assets including right of use assets, net			6.7		6.7
Total long-lived assets, net							6.3
Total operating earnings			(12.5)	(11.2)	(37.8)	(35.5)
Total capital expenditures			0.3	0.4	0.3	1.4
Total depreciation and amortization			0.4	0.4	1.2	1.0
Advanced Plastic Processing Technologies
Segment Reporting Information [Line Items]
Net sales			121.5	141.4	378.8	427.6
Advanced Plastic Processing Technologies | Segments [Member]
Segment Reporting Information [Line Items]
Total assets			435.3		435.3		482.3
Total long-lived assets including right of use assets, net			98.6		98.6
Total long-lived assets, net							82.1
Net sales			121.5	141.4	378.8	427.6
Total operating earnings			9.3	11.6	34.9	25.4
Total capital expenditures			3.9	4.1	14.1	9.2
Total depreciation and amortization			2.7	3.0	8.2	9.9
Melt Delivery and Control Systems
Segment Reporting Information [Line Items]
Net sales			98.9	108.8	302.8	349.4
Melt Delivery and Control Systems | Segments [Member]
Segment Reporting Information [Line Items]
Total assets			998.9		998.9		1,030.6
Total long-lived assets including right of use assets, net			113.1		113.1
Total long-lived assets, net							109.6
Net sales			98.9	108.8	302.8	349.4
Total operating earnings			16.6	25.4	55.0	82.4
Total capital expenditures			1.8	3.9	15.0	12.7
Total depreciation and amortization			7.8	7.9	23.4	24.8
Fluid Technologies
Segment Reporting Information [Line Items]
Net sales			29.9	32.6	88.8	98.2
Fluid Technologies | Segments [Member]
Segment Reporting Information [Line Items]
Total assets			149.5		149.5		145.3
Total long-lived assets including right of use assets, net			22.6		22.6
Total long-lived assets, net							$ 17.7
Net sales			29.9	32.6	88.8	98.2
Total operating earnings			5.9	6.1	16.9	18.5
Total capital expenditures			0.5	0.8	2.0	1.7
Total depreciation and amortization			$ 0.7	$ 1.1	$ 2.5	$ 3.3