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Segment Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) segment | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Assets | $ 1,532.0 |  | $ 1,532.0 |  | $ 1,173.7
Number of operating segments | segment |  |  | 2 |  |
Number of reportable segments | segment |  |  | 2 |  |
Net Sales [Abstract] |  |  |  |  |
Net sales | $ 257.8 | $ 209.3 | $ 746.4 | $ 641.2 |
Percentage of Net Sales (in hundredths) | 100.00% | 100.00% | 100.00% | 100.00% |
Operating Profit [Abstract] |  |  |  |  |
Operating Profit | $ 38.5 | $ 30.8 | $ 104.6 | $ 99.9 |
Operating Profit (in hundredths) | 100.00% | 100.00% | 100.00% | 100.00% |
Operating Segments [Member] | Engineered Papers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Assets | $ 523.0 |  | $ 523.0 |  | 569.3
Net Sales [Abstract] |  |  |  |  |
Net sales | $ 141.6 | $ 136.8 | $ 412.4 | $ 425.7 |
Percentage of Net Sales (in hundredths) | 54.90% | 65.40% | 55.30% | 66.40% |
Operating Profit [Abstract] |  |  |  |  |
Operating Profit | $ 32.3 | $ 32.0 | $ 90.0 | $ 103.4 |
Operating Profit (in hundredths) | 83.90% | 103.90% | 86.00% | 103.50% |
Operating Segments [Member] | Advanced Materials & Structures [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Assets | $ 918.4 |  | $ 918.4 |  | 505.1
Net Sales [Abstract] |  |  |  |  |
Net sales | $ 116.2 | $ 72.5 | $ 334.0 | $ 215.5 |
Percentage of Net Sales (in hundredths) | 45.10% | 34.60% | 44.70% | 33.60% |
Operating Profit [Abstract] |  |  |  |  |
Operating Profit | $ 15.4 | $ 8.7 | $ 40.9 | $ 22.8 |
Operating Profit (in hundredths) | 40.00% | 28.20% | 39.10% | 22.80% |
Unallocated [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Assets | $ 90.6 |  | $ 90.6 |  | $ 99.3
Operating Profit [Abstract] |  |  |  |  |
Operating Profit | $ (9.2) | $ (9.9) | $ (26.3) | $ (26.3) |
Operating Profit (in hundredths) | (23.90%) | (32.10%) | (25.10%) | (26.30%) |

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