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Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment									2
Number of reportable segments | segment									2
Net Sales
Net sales	$ 248.7	$ 260.3	$ 270.4	$ 261.9	$ 235.7	$ 257.8	$ 255.3	$ 233.3	$ 1,041.3	$ 982.1	$ 839.9
Percentage of Net Sales									100.00%	100.00%	100.00%
Operating Profit
Operating profit	26.8	$ 31.1	$ 42.1	$ 35.0	21.1	$ 39.3	$ 40.3	$ 27.6	$ 135.0	$ 128.3	$ 110.0
Percentage of Operating Profit									100.00%	100.00%	100.00%
Segment Assets	1,466.5				1,542.5				$ 1,466.5	$ 1,542.5	$ 1,173.7
Capital Spending									27.0	37.2	27.8
Depreciation									38.1	35.7	29.4
Long-Lived Assets	348.5				369.3				348.5	369.3	311.8
United States
Net Sales
Net sales									513.4	468.9	372.2
Operating Profit
Long-Lived Assets	115.8				115.0				115.8	115.0	89.6
France
Operating Profit
Long-Lived Assets	167.4				181.3				167.4	181.3	162.7
Brazil
Operating Profit
Long-Lived Assets	20.8				24.2				20.8	24.2	23.7
Poland
Operating Profit
Long-Lived Assets	16.8				21.9				16.8	21.9	20.0
Europe and the former Commonwealth of Independent States
Net Sales
Net sales									260.8	259.9	253.2
Asia-Pacific (including China)
Net Sales
Net sales									159.4	148.4	129.4
Latin America
Net Sales
Net sales									53.5	57.9	47.4
Other foreign countries
Net Sales
Net sales									54.2	47.0	37.7
Operating Profit
Long-Lived Assets	27.7				26.9				27.7	26.9	15.8
Unallocated
Operating Profit
Operating profit									$ (36.3)	$ (39.9)	$ (40.9)
Percentage of Operating Profit									(26.90%)	(31.10%)	(37.20%)
Segment Assets	143.0				193.2				$ 143.0	$ 193.2	$ 99.3
Capital Spending									0.3	0.1	0.1
Depreciation									0.1	0.0	0.0
Advanced Materials & Structures
Net Sales
Net sales									$ 467.9	$ 433.2	$ 280.6
Percentage of Net Sales									44.90%	44.10%	33.40%
Advanced Materials & Structures | United States
Net Sales
Net sales									$ 320.1	$ 292.7	$ 183.3
Advanced Materials & Structures | Europe and the former Commonwealth of Independent States
Net Sales
Net sales									46.2	51.6	41.4
Advanced Materials & Structures | Asia-Pacific (including China)
Net Sales
Net sales									76.6	66.1	43.4
Advanced Materials & Structures | Latin America
Net Sales
Net sales									10.0	9.4	6.2
Advanced Materials & Structures | Other foreign countries
Net Sales
Net sales									15.0	13.4	6.3
Advanced Materials & Structures | Operating Segments
Operating Profit
Operating profit									$ 49.5	$ 48.5	$ 9.0
Percentage of Operating Profit									36.70%	37.80%	8.20%
Segment Assets	527.4				537.6				$ 527.4	$ 537.6	$ 569.3
Capital Spending									15.0	11.5	10.1
Depreciation									14.1	12.3	7.1
Engineered Papers
Net Sales
Net sales									$ 573.4	$ 548.9	$ 559.3
Percentage of Net Sales									55.10%	55.90%	66.60%
Engineered Papers | United States
Net Sales
Net sales									$ 193.3	$ 176.2	$ 188.9
Engineered Papers | Europe and the former Commonwealth of Independent States
Net Sales
Net sales									214.6	208.3	211.8
Engineered Papers | Asia-Pacific (including China)
Net Sales
Net sales									82.8	82.3	86.0
Engineered Papers | Latin America
Net Sales
Net sales									43.5	48.5	41.2
Engineered Papers | Other foreign countries
Net Sales
Net sales									39.2	33.6	31.4
Engineered Papers | Operating Segments
Operating Profit
Operating profit									$ 121.8	$ 119.7	$ 141.9
Percentage of Operating Profit									90.20%	93.30%	129.00%
Segment Assets	$ 796.1				$ 811.7				$ 796.1	$ 811.7	$ 505.1
Capital Spending									11.7	25.6	17.6
Depreciation									$ 23.9	$ 23.4	$ 22.3

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