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Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			2
Number of reportable segments | segment			2
Net Sales [Abstract]
Net Sales	$ 269.9	$ 270.4	$ 527.9	$ 532.3
Percentage of Net Sales (in hundredths)	100.00%	100.00%	100.00%	100.00%
Operating Profit [Abstract]
Operating Profit	$ 44.2	$ 42.1	$ 74.6	$ 77.1
Operating Profit (in hundredths)	100.00%	100.00%	100.00%	100.00%
Assets	$ 1,489.4		$ 1,489.4		$ 1,466.5
Advanced Materials & Structures
Net Sales [Abstract]
Net Sales	$ 126.7	$ 124.0	$ 247.2	$ 239.3
Percentage of Net Sales (in hundredths)	46.90%	45.90%	46.80%	45.00%
Engineered Papers
Net Sales [Abstract]
Net Sales	$ 143.2	$ 146.4	$ 280.7	$ 293.0
Percentage of Net Sales (in hundredths)	53.10%	54.10%	53.20%	55.00%
Operating Segments | Advanced Materials & Structures
Operating Profit [Abstract]
Operating Profit	$ 20.4	$ 17.0	$ 35.3	$ 27.6
Operating Profit (in hundredths)	46.20%	40.40%	47.30%	35.80%
Assets	$ 814.9		$ 814.9		796.1
Operating Segments | Engineered Papers
Operating Profit [Abstract]
Operating Profit	$ 32.5	$ 33.3	$ 61.2	$ 67.2
Operating Profit (in hundredths)	73.50%	79.10%	82.10%	87.20%
Assets	$ 518.6		$ 518.6		527.4
Unallocated
Operating Profit [Abstract]
Operating Profit	$ (8.7)	$ (8.2)	$ (21.9)	$ (17.7)
Operating Profit (in hundredths)	(19.70%)	(19.50%)	(29.40%)	(23.00%)
Assets	$ 155.9		$ 155.9		$ 143.0

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