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Segment Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |
Assets | $ 1,547.2 |  | $ 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% |
Revenue, Net | $ 261.9 | $ 233.3 |
Operating Profit [Abstract] |  |  |
Operating Profit | $ 35.0 | $ 27.6 |
Operating Profit (in hundredths) | 100.00% | 100.00% |
Operating Segments [Member] | Engineered Papers [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | $ 816.1 |  | 811.7
Net Sales [Abstract] |  |  |
Percentage of Net Sales (in hundredths) | 56.00% | 57.10% |
Revenue, Net | $ 146.6 | $ 133.3 |
Operating Profit [Abstract] |  |  |
Operating Profit | $ 33.9 | $ 27.9 |
Operating Profit (in hundredths) | 96.90% | 101.10% |
Operating Segments [Member] | Advanced Materials & Structures Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | $ 543.6 |  | 537.6
Net Sales [Abstract] |  |  |
Percentage of Net Sales (in hundredths) | 44.00% | 42.90% |
Revenue, Net | $ 115.3 | $ 100.0 |
Operating Profit [Abstract] |  |  |
Operating Profit | $ 10.6 | $ 8.9 |
Operating Profit (in hundredths) | 30.30% | 32.20% |
Unallocated [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | $ 187.5 |  | $ 193.2
Operating Profit [Abstract] |  |  |
Operating Profit | $ (9.5) | $ (9.2) |
Operating Profit (in hundredths) | (27.20%) | (33.30%) |

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