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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue from External Customer [Line Items]
Total revenues	$ 260.3	$ 257.8	$ 792.6	$ 746.4
Product Revenues [Member]
Revenue from External Customer [Line Items]
Total revenues	242.1	234.7	725.5	669.2
Material Conversion Revenues [Member]
Revenue from External Customer [Line Items]
Total revenues	15.8	21.1	60.4	71.9
Other Revenues [Member]
Revenue from External Customer [Line Items]
Total revenues	2.4	2.0	6.7	5.3
Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	120.8	116.2	360.1	334.0
Advanced Materials & Structures Segment [Member] | Product Revenues [Member]
Revenue from External Customer [Line Items]
Total revenues	117.9	112.4	346.9	318.4
Advanced Materials & Structures Segment [Member] | Material Conversion Revenues [Member]
Revenue from External Customer [Line Items]
Total revenues	1.9	3.2	10.3	14.0
Advanced Materials & Structures Segment [Member] | Other Revenues [Member]
Revenue from External Customer [Line Items]
Total revenues	1.0	0.6	2.9	1.6
Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	139.5	141.6	432.5	412.4
Engineered Papers Segment [Member] | Product Revenues [Member]
Revenue from External Customer [Line Items]
Total revenues	124.2	122.3	378.6	350.8
Engineered Papers Segment [Member] | Material Conversion Revenues [Member]
Revenue from External Customer [Line Items]
Total revenues	13.9	17.9	50.1	57.9
Engineered Papers Segment [Member] | Other Revenues [Member]
Revenue from External Customer [Line Items]
Total revenues	1.4	1.4	3.8	3.7
UNITED STATES
Revenue from External Customer [Line Items]
Total revenues	131.7	127.4	394.3	367.8
UNITED STATES | Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	84.7	80.6	247.6	227.6
UNITED STATES | Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	47.0	46.8	146.7	140.2
Europe and the former Commonwealth of Independent States [Member]
Revenue from External Customer [Line Items]
Total revenues	61.0	66.3	205.1	192.7
Europe and the former Commonwealth of Independent States [Member] | Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	10.0	13.5	36.5	37.6
Europe and the former Commonwealth of Independent States [Member] | Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	51.0	52.8	168.6	155.1
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenues	38.2	37.6	114.0	110.5
Asia Pacific [Member] | Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	20.3	16.4	56.9	50.8
Asia Pacific [Member] | Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	17.9	21.2	57.1	59.7
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenues	13.1	13.4	40.8	40.2
Latin America [Member] | Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	2.1	2.4	7.8	7.8
Latin America [Member] | Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	11.0	11.0	33.0	32.4
Other Foreign Countries [Member]
Revenue from External Customer [Line Items]
Total revenues	16.3	13.1	38.4	35.2
Other Foreign Countries [Member] | Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	3.7	3.3	11.3	10.2
Other Foreign Countries [Member] | Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 12.6	$ 9.8	$ 27.1	$ 25.0

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