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Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment									2
Number of reportable segments | segment									2
Net Sales
Net sales	$ 279.4	$ 279.3	$ 254.2	$ 261.5	$ 238.5	$ 256.4	$ 269.9	$ 258.0	$ 1,074.4	$ 1,022.8	$ 1,041.3
Percentage of Net Sales									100.00%	100.00%	100.00%
Operating Profit
Operating profit	23.3	$ 37.0	$ 34.4	$ 34.1	24.8	$ 34.6	$ 44.2	$ 30.4	$ 128.8	$ 134.0	$ 135.0
Percentage of Operating Profit									100.00%	100.00%	100.00%
Capital Spending									$ 30.1	$ 28.6	$ 27.0
Depreciation									42.2	35.8	38.1
Long-Lived Assets	351.9				342.2				351.9	342.2	348.5
United States
Net Sales
Net sales									538.6	514.1	513.4
Operating Profit
Long-Lived Assets	122.1				118.5				122.1	118.5	115.8
France
Operating Profit
Long-Lived Assets	169.3				158.8				169.3	158.8	167.4
Brazil
Operating Profit
Long-Lived Assets	15.2				19.5				15.2	19.5	20.8
Poland
Operating Profit
Long-Lived Assets	12.9				14.7				12.9	14.7	16.8
Other foreign countries
Net Sales
Net sales									47.9	64.5	54.2
Operating Profit
Long-Lived Assets	$ 32.4				$ 30.7				32.4	30.7	27.7
Advanced Materials & Structures
Net Sales
Net sales									543.5	477.2	467.9
Advanced Materials & Structures | United States
Net Sales
Net sales									376.7	331.3	320.1
Advanced Materials & Structures | Other foreign countries
Net Sales
Net sales									15.4	14.9	15.0
Engineered Papers
Net Sales
Net sales									530.9	545.6	573.4
Engineered Papers | United States
Net Sales
Net sales									161.9	182.8	193.3
Engineered Papers | Other foreign countries
Net Sales
Net sales									32.5	49.6	39.2
Operating Segments | Advanced Materials & Structures
Net Sales
Net sales									$ 543.5	$ 477.2	$ 467.9
Percentage of Net Sales									50.60%	46.70%	44.90%
Operating Profit
Operating profit									$ 64.8	$ 64.3	$ 49.5
Percentage of Operating Profit									50.30%	48.00%	36.70%
Capital Spending									$ 14.5	$ 16.1	$ 15.0
Depreciation									14.5	12.8	14.1
Operating Segments | Engineered Papers
Net Sales
Net sales									$ 530.9	$ 545.6	$ 573.4
Percentage of Net Sales									49.40%	53.30%	55.10%
Operating Profit
Operating profit									$ 116.8	$ 119.2	$ 121.8
Percentage of Operating Profit									90.70%	89.00%	90.20%
Capital Spending									$ 15.5	$ 12.0	$ 11.7
Depreciation									27.5	22.8	23.9
Unallocated
Operating Profit
Operating profit									$ (52.8)	$ (49.5)	$ (36.3)
Percentage of Operating Profit									(41.00%)	(37.00%)	(26.90%)
Capital Spending									$ 0.1	$ 0.5	$ 0.3
Depreciation									$ 0.2	$ 0.2	$ 0.1

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