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Segment Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 2 |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 2 |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 198.7 | $ 209.3 | $ 217.3 | $ 214.6 | $ 209.8 | $ 184.4 | $ 181.9 | $ 188.0 | $ 839.9 | $ 764.1 | $ 794.3
Percentage of Net Sales |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating profit | 6.2 | $ 30.8 | $ 37.5 | $ 31.6 | 24.7 | $ 31.8 | $ 24.0 | $ 22.5 | $ 106.1 | $ 103.0 | $ 106.1
Percentage of Operating Profit |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Segment Assets | 1,173.7 |  |  |  | 1,290.0 |  |  |  | $ 1,173.7 | $ 1,290.0 | $ 1,185.0
Capital Spending |  |  |  |  |  |  |  |  | 27.8 | 24.2 | 35.1
Depreciation |  |  |  |  |  |  |  |  | 29.4 | 30.7 | 35.3
Long-Lived Assets | 311.8 |  |  |  | 310.6 |  |  |  | 311.8 | 310.6 | 365.8
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 372.2 | 310.7 | 263.7
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 89.6 |  |  |  | 87.5 |  |  |  | 89.6 | 87.5 | 75.5
France [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 162.7 |  |  |  | 163.5 |  |  |  | 162.7 | 163.5 | 187.2
Philippines [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 30.8
Brazil [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 23.7 |  |  |  | 20.1 |  |  |  | 23.7 | 20.1 | 27.8
Poland [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 20.0 |  |  |  | 23.6 |  |  |  | 20.0 | 23.6 | 29.0
Europe and the former Commonwealth of Independent States [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 253.2 | 261.2 | 304.6
Asia/Pacific (including China) [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 129.4 | 118.5 | 125.3
Latin America [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 47.4 | 34.6 | 54.9
Other foreign countries [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 37.7 | 39.1 | 45.8
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 15.8 |  |  |  | 15.9 |  |  |  | 15.8 | 15.9 | 15.5
Operating Segments [Member] | Engineered Papers [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 559.3 | $ 583.9 | $ 666.9
Percentage of Net Sales |  |  |  |  |  |  |  |  | 66.60% | 76.40% | 84.00%
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | $ 138.0 | $ 121.5 | $ 124.5
Percentage of Operating Profit |  |  |  |  |  |  |  |  | 130.00% | 118.00% | 117.30%
Segment Assets | 505.1 |  |  |  | 507.3 |  |  |  | $ 505.1 | $ 507.3 | $ 611.9
Capital Spending |  |  |  |  |  |  |  |  | 17.6 | 12.5 | 26.1
Depreciation |  |  |  |  |  |  |  |  | 22.3 | 25.6 | 31.0
Operating Segments [Member] | Advanced Materials & Structures [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 280.6 | $ 180.2 | $ 127.4
Percentage of Net Sales |  |  |  |  |  |  |  |  | 33.40% | 23.60% | 16.00%
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | $ 9.0 | $ 16.7 | $ 10.2
Percentage of Operating Profit |  |  |  |  |  |  |  |  | 8.50% | 16.20% | 9.60%
Segment Assets | 569.3 |  |  |  | 648.4 |  |  |  | $ 569.3 | $ 648.4 | $ 320.1
Capital Spending |  |  |  |  |  |  |  |  | 10.1 | 11.2 | 8.7
Depreciation |  |  |  |  |  |  |  |  | 7.1 | 5.5 | 3.9
Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | $ (40.9) | $ (35.2) | $ (28.6)
Percentage of Operating Profit |  |  |  |  |  |  |  |  | (38.50%) | (34.20%) | (26.90%)
Segment Assets | $ 99.3 |  |  |  | $ 134.3 |  |  |  | $ 99.3 | $ 134.3 | $ 253.0
Capital Spending |  |  |  |  |  |  |  |  | 0.1 | 0.5 | 0.3
Depreciation |  |  |  |  |  |  |  |  | $ 0.0 | $ (0.4) | $ 0.4

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