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Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Assets	$ 1,485.1		$ 1,485.1		$ 1,542.5
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%
Revenues	$ 270.4	$ 255.3	$ 532.3	$ 488.6
Operating Profit [Abstract]
Operating Profit	$ 42.1	$ 40.3	$ 77.1	$ 67.9
Operating Profit (in hundredths)	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Engineered Papers [Member]
Segment Reporting Information [Line Items]
Assets	$ 810.0		$ 810.0		811.7
Net Sales [Abstract]
Percentage of Net Sales (in hundredths)	54.10%	53.90%	55.00%	55.40%
Revenues	$ 146.4	$ 137.5	$ 293.0	$ 270.8
Operating Profit [Abstract]
Operating Profit	$ 33.3	$ 31.6	$ 67.2	$ 59.5
Operating Profit (in hundredths)	79.10%	78.40%	87.20%	87.60%
Operating Segments [Member] | Advanced Materials & Structures Segment [Member]
Segment Reporting Information [Line Items]
Assets	$ 540.3		$ 540.3		537.6
Net Sales [Abstract]
Percentage of Net Sales (in hundredths)	45.90%	46.10%	45.00%	44.60%
Revenues	$ 124.0	$ 117.8	$ 239.3	$ 217.8
Operating Profit [Abstract]
Operating Profit	$ 17.0	$ 16.6	$ 27.6	$ 25.5
Operating Profit (in hundredths)	40.40%	41.20%	35.80%	37.60%
Unallocated [Member]
Segment Reporting Information [Line Items]
Assets	$ 134.8		$ 134.8		$ 193.2
Operating Profit [Abstract]
Operating Profit	$ (8.2)	$ (7.9)	$ (17.7)	$ (17.1)
Operating Profit (in hundredths)	(19.50%)	(19.60%)	(23.00%)	(25.20%)

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The percentage of segment operating profit contribution to total operating profit.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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