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Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment									2
Number of reportable segments | segment									2
Net Sales
Net sales	$ 390.4	$ 383.6	$ 377.8	$ 288.2	$ 279.4	$ 279.3	$ 254.2	$ 261.5	$ 1,440.0	$ 1,074.4	$ 1,022.8
Percentage of Net Sales									100.00%	100.00%	100.00%
Operating Profit
Operating profit	10.9	$ 23.0	$ 15.9	$ 33.5	23.3	$ 37.0	$ 34.4	$ 34.1	$ 83.3	$ 128.8	$ 134.0
Percentage of Operating Profit									99.90%	100.00%	100.00%
Capital Spending									$ 35.9	$ 30.1	$ 28.6
Depreciation									47.8	42.2	35.8
Long-Lived Assets	477.8				351.9				477.8	351.9	342.2
U.S.
Net Sales
Net sales									718.3	538.6	514.1
Operating Profit
Long-Lived Assets	173.9				122.1				173.9	122.1	118.5
France
Operating Profit
Long-Lived Assets	169.1				169.3				169.1	169.3	158.8
U.K.
Operating Profit
Long-Lived Assets	65.4				10.3				65.4	10.3	9.9
Brazil
Operating Profit
Long-Lived Assets	15.3				15.2				15.3	15.2	19.5
Poland
Operating Profit
Long-Lived Assets	10.4				12.9				10.4	12.9	14.7
Other foreign countries
Net Sales
Net sales									49.4	47.9	64.5
Operating Profit
Long-Lived Assets	$ 43.7				$ 22.1				43.7	22.1	20.8
Advanced Materials & Structures
Net Sales
Net sales									930.7	543.5	477.2
Advanced Materials & Structures | U.S.
Net Sales
Net sales									562.5	376.7	331.3
Advanced Materials & Structures | Other foreign countries
Net Sales
Net sales									18.1	15.4	14.9
Engineered Papers
Net Sales
Net sales									509.3	530.9	545.6
Engineered Papers | U.S.
Net Sales
Net sales									155.8	161.9	182.8
Engineered Papers | Other foreign countries
Net Sales
Net sales									31.3	32.5	49.6
Operating Segments | Advanced Materials & Structures
Net Sales
Net sales									$ 930.7	$ 543.5	$ 477.2
Percentage of Net Sales									64.60%	50.60%	46.70%
Operating Profit
Operating profit									$ 61.6	$ 64.8	$ 64.3
Percentage of Operating Profit									73.90%	50.30%	48.00%
Capital Spending									$ 19.5	$ 14.5	$ 16.1
Depreciation									25.9	14.5	12.8
Operating Segments | Engineered Papers
Net Sales
Net sales									$ 509.3	$ 530.9	$ 545.6
Percentage of Net Sales									35.40%	49.40%	53.30%
Operating Profit
Operating profit									$ 100.5	$ 116.8	$ 119.2
Percentage of Operating Profit									120.60%	90.70%	89.00%
Capital Spending									$ 16.4	$ 15.5	$ 12.0
Depreciation									21.7	27.5	22.8
Unallocated
Operating Profit
Operating profit									$ (78.8)	$ (52.8)	$ (49.5)
Percentage of Operating Profit									(94.60%)	(41.00%)	(37.00%)
Capital Spending									$ 0.0	$ 0.1	$ 0.5
Depreciation									$ 0.2	$ 0.2	$ 0.2

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