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Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment									2
Number of reportable segments | segment									2
Net Sales [Abstract]
Net sales	$ 198.7	$ 209.3	$ 217.3	$ 214.6	$ 209.8	$ 184.4	$ 181.9	$ 188.0	$ 839.9	$ 764.1	$ 794.3
Percentage of Net Sales									100.00%	100.00%	100.00%
Operating Profit [Abstract]
Operating profit	6.2	$ 30.8	$ 37.5	$ 31.6	24.7	$ 31.8	$ 24.0	$ 22.5	$ 106.1	$ 103.0	$ 106.1
Percentage of Operating Profit									100.00%	100.00%	100.00%
Segment Assets	1,173.7				1,290.0				$ 1,173.7	$ 1,290.0	$ 1,185.0
Capital Spending									27.8	24.2	35.1
Depreciation									29.4	30.7	35.3
Long-Lived Assets	311.8				310.6				311.8	310.6	365.8
United States [Member]
Net Sales [Abstract]
Net sales									372.2	310.7	263.7
Operating Profit [Abstract]
Long-Lived Assets	89.6				87.5				89.6	87.5	75.5
France [Member]
Operating Profit [Abstract]
Long-Lived Assets	162.7				163.5				162.7	163.5	187.2
Philippines [Member]
Operating Profit [Abstract]
Long-Lived Assets	0.0				0.0				0.0	0.0	30.8
Brazil [Member]
Operating Profit [Abstract]
Long-Lived Assets	23.7				20.1				23.7	20.1	27.8
Poland [Member]
Operating Profit [Abstract]
Long-Lived Assets	20.0				23.6				20.0	23.6	29.0
Europe and the former Commonwealth of Independent States [Member]
Net Sales [Abstract]
Net sales									253.2	261.2	304.6
Asia/Pacific (including China) [Member]
Net Sales [Abstract]
Net sales									129.4	118.5	125.3
Latin America [Member]
Net Sales [Abstract]
Net sales									47.4	34.6	54.9
Other foreign countries [Member]
Net Sales [Abstract]
Net sales									37.7	39.1	45.8
Operating Profit [Abstract]
Long-Lived Assets	15.8				15.9				15.8	15.9	15.5
Operating Segments [Member] | Engineered Papers [Member]
Net Sales [Abstract]
Net sales									$ 559.3	$ 583.9	$ 666.9
Percentage of Net Sales									66.60%	76.40%	84.00%
Operating Profit [Abstract]
Operating profit									$ 138.0	$ 121.5	$ 124.5
Percentage of Operating Profit									130.00%	118.00%	117.30%
Segment Assets	505.1				507.3				$ 505.1	$ 507.3	$ 611.9
Capital Spending									17.6	12.5	26.1
Depreciation									22.3	25.6	31.0
Operating Segments [Member] | Advanced Materials & Structures [Member]
Net Sales [Abstract]
Net sales									$ 280.6	$ 180.2	$ 127.4
Percentage of Net Sales									33.40%	23.60%	16.00%
Operating Profit [Abstract]
Operating profit									$ 9.0	$ 16.7	$ 10.2
Percentage of Operating Profit									8.50%	16.20%	9.60%
Segment Assets	569.3				648.4				$ 569.3	$ 648.4	$ 320.1
Capital Spending									10.1	11.2	8.7
Depreciation									7.1	5.5	3.9
Unallocated [Member]
Operating Profit [Abstract]
Operating profit									$ (40.9)	$ (35.2)	$ (28.6)
Percentage of Operating Profit									(38.50%)	(34.20%)	(26.90%)
Segment Assets	$ 99.3				$ 134.3				$ 99.3	$ 134.3	$ 253.0
Capital Spending									0.1	0.5	0.3
Depreciation									$ 0.0	$ (0.4)	$ 0.4

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