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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 270.4	$ 255.3	$ 532.3	$ 488.6
Product Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	254.2	229.9	483.4	434.5
Material Conversion Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	13.7	23.6	44.6	50.8
Other Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2.5	1.8	4.3	3.3
Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	124.0	117.8	239.3	217.8
Advanced Materials & Structures Segment [Member] | Product Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	120.6	114.7	229.0	206.0
Advanced Materials & Structures Segment [Member] | Material Conversion Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2.2	2.6	8.4	10.8
Advanced Materials & Structures Segment [Member] | Other Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1.2	0.5	1.9	1.0
Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	146.4	137.5	293.0	270.8
Engineered Papers Segment [Member] | Product Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	133.6	115.2	254.4	228.5
Engineered Papers Segment [Member] | Material Conversion Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	11.5	21.0	36.2	40.0
Engineered Papers Segment [Member] | Other Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1.3	1.3	2.4	2.3
UNITED STATES
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	134.8	125.4	262.6	240.4
UNITED STATES | Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	84.8	78.3	162.9	147.0
UNITED STATES | Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	50.0	47.1	99.7	93.4
Europe and the former Commonwealth of Independent States [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	70.7	66.0	144.1	126.4
Europe and the former Commonwealth of Independent States [Member] | Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	10.7	12.9	26.5	24.1
Europe and the former Commonwealth of Independent States [Member] | Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	60.0	53.1	117.6	102.3
Segment, Geographical, Groups of Countries, Group Four [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	39.9	37.1	75.8	72.9
Segment, Geographical, Groups of Countries, Group Four [Member] | Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	22.0	19.7	36.6	34.4
Segment, Geographical, Groups of Countries, Group Four [Member] | Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	17.9	17.4	39.2	38.5
Segment, Geographical, Groups of Countries, Group Three [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	13.0	14.0	27.7	26.8
Segment, Geographical, Groups of Countries, Group Three [Member] | Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2.5	3.1	5.7	5.4
Segment, Geographical, Groups of Countries, Group Three [Member] | Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	10.5	10.9	22.0	21.4
Other Foreign Countries [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	12.0	12.8	22.1	22.1
Other Foreign Countries [Member] | Advanced Materials & Structures Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4.0	3.8	7.6	6.9
Other Foreign Countries [Member] | Engineered Papers Segment [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 8.0	$ 9.0	$ 14.5	$ 15.2

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