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Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			2
Number of reportable segments | segment			2
Net Sales [Abstract]
Percentage of Net Sales (in hundredths)	100.00%	100.00%	100.00%	100.00%
Net Sales	$ 260.3	$ 257.8	$ 792.6	$ 746.4
Operating Profit [Abstract]
Operating Profit	$ 31.1	$ 39.3	$ 108.2	$ 107.2
Operating Profit (in hundredths)	100.00%	100.00%	100.00%	100.00%
Assets	$ 1,487.3		$ 1,487.3		$ 1,542.5
Operating Segments [Member] | Engineered Papers [Member]
Net Sales [Abstract]
Percentage of Net Sales (in hundredths)	53.60%	54.90%	54.60%	55.30%
Net Sales	$ 139.5	$ 141.6	$ 432.5	$ 412.4
Operating Profit [Abstract]
Operating Profit	$ 27.5	$ 33.1	$ 94.7	$ 92.6
Operating Profit (in hundredths)	88.40%	84.20%	87.50%	86.40%
Assets	$ 808.6		$ 808.6		811.7
Operating Segments [Member] | Advanced Materials & Structures Segment [Member]
Net Sales [Abstract]
Percentage of Net Sales (in hundredths)	46.40%	45.10%	45.40%	44.70%
Net Sales	$ 120.8	$ 116.2	$ 360.1	$ 334.0
Operating Profit [Abstract]
Operating Profit	$ 11.9	$ 15.4	$ 39.5	$ 40.9
Operating Profit (in hundredths)	38.30%	39.20%	36.50%	38.20%
Assets	$ 511.8		$ 511.8		537.6
Unallocated [Member]
Operating Profit [Abstract]
Operating Profit	$ (8.3)	$ (9.2)	$ (26.0)	$ (26.3)
Operating Profit (in hundredths)	(26.70%)	(23.40%)	(24.00%)	(24.60%)
Assets	$ 166.9		$ 166.9		$ 193.2
Accounting Standards Update 2017-07 [Member]
Segment Reporting Information [Line Items]
Effect of change on operating results		$ 0.8		$ 2.6

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