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Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment									2
Number of reportable segments | segment									2	2
Net Sales [Abstract]
Net sales	$ 235.7	$ 257.8	$ 255.3	$ 233.3	$ 198.7	$ 209.3	$ 217.3	$ 214.6	$ 982.1	$ 839.9	$ 764.1
Percentage of Net Sales									100.00%	100.00%	100.00%
Operating Profit [Abstract]
Operating profit	20.1	$ 38.5	$ 39.5	$ 26.6	6.2	$ 30.8	$ 37.5	$ 31.6	$ 124.7	$ 106.1	$ 103.0
Percentage of Operating Profit									100.00%	100.00%	100.00%
Segment Assets	1,542.5				1,173.7				$ 1,542.5	$ 1,173.7	$ 1,290.0
Capital Spending									37.2	27.8	24.2
Depreciation									35.7	29.4	30.7
Long-Lived Assets	369.3				311.8				369.3	311.8	310.6
United States [Member]
Net Sales [Abstract]
Net sales									468.9	372.2	310.7
Operating Profit [Abstract]
Long-Lived Assets	115.0				89.6				115.0	89.6	87.5
France [Member]
Operating Profit [Abstract]
Long-Lived Assets	181.3				162.7				181.3	162.7	163.5
Brazil [Member]
Operating Profit [Abstract]
Long-Lived Assets	24.2				23.7				24.2	23.7	20.1
Poland [Member]
Operating Profit [Abstract]
Long-Lived Assets	21.9				20.0				21.9	20.0	23.6
Europe and the former Commonwealth of Independent States [Member]
Net Sales [Abstract]
Net sales									259.9	253.2	261.2
Asia/Pacific (including China) [Member]
Net Sales [Abstract]
Net sales									148.4	129.4	118.5
Latin America [Member]
Net Sales [Abstract]
Net sales									57.9	47.4	34.6
Other foreign countries [Member]
Net Sales [Abstract]
Net sales									47.0	37.7	39.1
Operating Profit [Abstract]
Long-Lived Assets	26.9				15.8				26.9	15.8	15.9
Operating Segments [Member] | Engineered Papers [Member]
Net Sales [Abstract]
Net sales									$ 548.9	$ 559.3	$ 583.9
Percentage of Net Sales									55.90%	66.60%	76.40%
Operating Profit [Abstract]
Operating profit									$ 116.1	$ 138.0	$ 121.5
Percentage of Operating Profit									93.10%	130.00%	118.00%
Segment Assets	537.6				569.3				$ 537.6	$ 569.3	$ 507.3
Capital Spending									25.6	17.6	12.5
Depreciation									23.4	22.3	25.6
Operating Segments [Member] | Advanced Materials & Structures [Member]
Net Sales [Abstract]
Net sales									$ 433.2	$ 280.6	$ 180.2
Percentage of Net Sales									44.10%	33.40%	23.60%
Operating Profit [Abstract]
Operating profit									$ 48.5	$ 9.0	$ 16.7
Percentage of Operating Profit									38.90%	8.50%	16.20%
Segment Assets	811.7				505.1				$ 811.7	$ 505.1	$ 648.4
Capital Spending									11.5	10.1	11.2
Depreciation									12.3	7.1	5.5
Unallocated [Member]
Operating Profit [Abstract]
Operating profit									$ (39.9)	$ (40.9)	$ (35.2)
Percentage of Operating Profit									(32.00%)	(38.50%)	(34.20%)
Segment Assets	$ 193.2				$ 99.3				$ 193.2	$ 99.3	$ 134.3
Capital Spending									0.1	0.1	0.5
Depreciation									$ 0.0	$ 0.0	$ (0.4)

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