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Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment									2
Number of reportable segments | segment									2
Net Sales
Net sales	$ 238.5	$ 256.4	$ 269.9	$ 258.0	$ 248.7	$ 260.3	$ 270.4	$ 261.9	$ 1,022.8	$ 1,041.3	$ 982.1
Percentage of Net Sales									100.00%	100.00%	100.00%
Operating Profit
Operating profit	24.8	$ 34.6	$ 44.2	$ 30.4	26.8	$ 31.1	$ 42.1	$ 35.0	$ 134.0	$ 135.0	$ 128.3
Percentage of Operating Profit									100.00%	100.00%	100.00%
Segment Assets	1,471.7				1,466.5				$ 1,471.7	$ 1,466.5	$ 1,542.5
Capital Spending									28.6	27.0	37.2
Depreciation									35.8	38.1	35.7
Long-Lived Assets	342.2				348.5				342.2	348.5	369.3
United States
Net Sales
Net sales									514.1	513.4	468.9
Operating Profit
Long-Lived Assets	118.5				115.8				118.5	115.8	115.0
France
Operating Profit
Long-Lived Assets	158.8				167.4				158.8	167.4	181.3
Brazil
Operating Profit
Long-Lived Assets	19.5				20.8				19.5	20.8	24.2
Poland
Operating Profit
Long-Lived Assets	14.7				16.8				14.7	16.8	21.9
Europe and the former Commonwealth of Independent States
Net Sales
Net sales									218.4	260.8	259.9
Asia-Pacific (including China)
Net Sales
Net sales									172.6	159.4	148.4
Latin America
Net Sales
Net sales									53.2	53.5	57.9
Other foreign countries
Net Sales
Net sales									64.5	54.2	47.0
Operating Profit
Long-Lived Assets	30.7				27.7				30.7	27.7	26.9
Unallocated
Operating Profit
Operating profit									$ (49.5)	$ (36.3)	$ (39.9)
Percentage of Operating Profit									(37.00%)	(26.90%)	(31.10%)
Segment Assets	178.1				143.0				$ 178.1	$ 143.0	$ 193.2
Capital Spending									0.5	0.3	0.1
Depreciation									0.2	0.1	0.0
Advanced Materials & Structures
Net Sales
Net sales									$ 477.2	$ 467.9	$ 433.2
Percentage of Net Sales									46.70%	44.90%	44.10%
Advanced Materials & Structures | United States
Net Sales
Net sales									$ 331.3	$ 320.1	$ 292.7
Advanced Materials & Structures | Europe and the former Commonwealth of Independent States
Net Sales
Net sales									45.8	46.2	51.6
Advanced Materials & Structures | Asia-Pacific (including China)
Net Sales
Net sales									77.6	76.6	66.1
Advanced Materials & Structures | Latin America
Net Sales
Net sales									7.6	10.0	9.4
Advanced Materials & Structures | Other foreign countries
Net Sales
Net sales									14.9	15.0	13.4
Advanced Materials & Structures | Operating Segments
Operating Profit
Operating profit									$ 64.3	$ 49.5	$ 48.5
Percentage of Operating Profit									48.00%	36.70%	37.80%
Segment Assets	781.2				796.1				$ 781.2	$ 796.1	$ 811.7
Capital Spending									16.1	15.0	11.5
Depreciation									12.8	14.1	12.3
Engineered Papers
Net Sales
Net sales									$ 545.6	$ 573.4	$ 548.9
Percentage of Net Sales									53.30%	55.10%	55.90%
Engineered Papers | United States
Net Sales
Net sales									$ 182.8	$ 193.3	$ 176.2
Engineered Papers | Europe and the former Commonwealth of Independent States
Net Sales
Net sales									172.6	214.6	208.3
Engineered Papers | Asia-Pacific (including China)
Net Sales
Net sales									95.0	82.8	82.3
Engineered Papers | Latin America
Net Sales
Net sales									45.6	43.5	48.5
Engineered Papers | Other foreign countries
Net Sales
Net sales									49.6	39.2	33.6
Engineered Papers | Operating Segments
Operating Profit
Operating profit									$ 119.2	$ 121.8	$ 119.7
Percentage of Operating Profit									89.00%	90.20%	93.30%
Segment Assets	$ 512.4				$ 527.4				$ 512.4	$ 527.4	$ 537.6
Capital Spending									12.0	11.7	25.6
Depreciation									$ 22.8	$ 23.9	$ 23.4

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