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Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment									2
Number of reportable segments | segment									2
Net Sales [Abstract]
Net Sales	$ 209.8	$ 184.4	$ 181.9	$ 188.0	$ 181.7	$ 204.3	$ 203.6	$ 204.7	$ 764.1	$ 794.3	$ 772.8
Percentage of Net Sales									100.00%	100.00%	100.00%
Operating Profit [Abstract]
Operating Profit (loss)	24.7	$ 31.8	$ 24.0	$ 22.5	17.3	$ 25.2	$ 30.5	$ 33.1	$ 103.0	$ 106.1	$ 124.9
Percentage of Operating Profit									100.00%	100.00%	100.00%
Segment Assets	1,290.0				1,185.0				$ 1,290.0	$ 1,185.0	$ 1,224.1
Capital Spending									24.2	35.1	29.1
Depreciation									30.7	35.3	31.1
Long-Lived Assets	310.6				365.8				310.6	365.8	400.0
United States [Member]
Net Sales [Abstract]
Net Sales									310.7	263.7	223.1
Operating Profit [Abstract]
Long-Lived Assets	87.5				75.5				87.5	75.5	86.8
France [Member]
Operating Profit [Abstract]
Long-Lived Assets	163.5				187.2				163.5	187.2	210.2
Philippines [Member]
Operating Profit [Abstract]
Long-Lived Assets	0.0				30.8				0.0	30.8	31.5
Brazil [Member]
Operating Profit [Abstract]
Long-Lived Assets	20.1				27.8				20.1	27.8	35.1
Poland [Member]
Operating Profit [Abstract]
Long-Lived Assets	23.6				29.0				23.6	29.0	32.8
Europe and the former Commonwealth of Independent States [Member]
Net Sales [Abstract]
Net Sales									261.2	304.6	343.0
Asia/Pacific (including China) [Member]
Net Sales [Abstract]
Net Sales									118.5	125.3	113.6
Latin America [Member]
Net Sales [Abstract]
Net Sales									34.6	54.9	49.6
Other foreign countries [Member]
Net Sales [Abstract]
Net Sales									39.1	45.8	43.5
Operating Profit [Abstract]
Long-Lived Assets	15.9				15.5				15.9	15.5	3.6
Operating Segments [Member] | Engineered Papers [Member]
Net Sales [Abstract]
Net Sales									$ 583.9	$ 666.9	$ 768.6
Percentage of Net Sales									76.40%	84.00%	99.50%
Operating Profit [Abstract]
Operating Profit (loss)									$ 121.5	$ 124.5	$ 148.9
Percentage of Operating Profit									118.00%	117.30%	119.20%
Segment Assets	507.3				611.9				$ 507.3	$ 611.9	$ 873.8
Capital Spending									12.5	26.1	28.4
Depreciation									25.6	31.0	30.5
Operating Segments [Member] | Advanced Materials & Structures [Member]
Net Sales [Abstract]
Net Sales									$ 180.2	$ 127.4	$ 4.2
Percentage of Net Sales									23.60%	16.00%	0.50%
Operating Profit [Abstract]
Operating Profit (loss)									$ 16.7	$ 10.2	$ (1.1)
Percentage of Operating Profit									16.20%	9.60%	(0.90%)
Segment Assets	648.4				320.1				$ 648.4	$ 320.1	$ 286.3
Capital Spending									11.2	8.7	0.7
Depreciation									5.5	3.9	0.1
Unallocated [Member]
Operating Profit [Abstract]
Operating Profit (loss)									$ (35.2)	$ (28.6)	$ (22.9)
Percentage of Operating Profit									(34.20%)	(26.90%)	(18.30%)
Segment Assets	$ 134.3				$ 253.0				$ 134.3	$ 253.0	$ 64.0
Capital Spending									0.5	0.3	0.0
Depreciation									$ (0.4)	$ 0.4	$ 0.5

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