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Segment Information (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) segment | Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |
Number of operating segments | segment | 2 |
Number of reportable segments | segment | 2 |
Net Sales [Abstract] |  |
Net sales | $ 233.3 | $ 214.6
Percentage of Net Sales (in hundredths) | 100.00% | 100.00%
Operating Profit [Abstract] |  |
Operating Profit | $ 26.6 | $ 31.6
Operating Profit (in hundredths) | 100.00% | 100.00%
Operating Segments [Member] | Engineered Papers [Member] |  |
Net Sales [Abstract] |  |
Net sales | $ 133.3 | $ 143.6
Percentage of Net Sales (in hundredths) | 57.10% | 66.90%
Operating Profit [Abstract] |  |
Operating Profit | $ 26.9 | $ 35.5
Operating Profit (in hundredths) | 101.10% | 112.30%
Operating Segments [Member] | Advanced Materials & Structures [Member] |  |
Net Sales [Abstract] |  |
Net sales | $ 100.0 | $ 71.0
Percentage of Net Sales (in hundredths) | 42.90% | 33.10%
Operating Profit [Abstract] |  |
Operating Profit | $ 8.9 | $ 5.2
Operating Profit (in hundredths) | 33.50% | 16.50%
Unallocated [Member] |  |
Operating Profit [Abstract] |  |
Operating Profit | $ (9.2) | $ (9.1)
Operating Profit (in hundredths) | (34.60%) | (28.80%)

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