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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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