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Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 261.9 | $ 233.3
Product Revenues [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 229.2 | 204.6
Material Conversion Revenues [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 30.9 | 27.2
Other Revenues [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 1.8 | 1.5
Advanced Materials & Structures Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 115.3 | 100.0
Advanced Materials & Structures Segment [Member] | Product Revenues [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 108.4 | 91.3
Advanced Materials & Structures Segment [Member] | Material Conversion Revenues [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 6.2 | 8.2
Advanced Materials & Structures Segment [Member] | Other Revenues [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.7 | 0.5
Engineered Papers Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 146.6 | 133.3
Engineered Papers Segment [Member] | Product Revenues [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 120.8 | 113.3
Engineered Papers Segment [Member] | Material Conversion Revenues [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 24.7 | 19.0
Engineered Papers Segment [Member] | Other Revenues [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 1.1 | 1.0
UNITED STATES |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 127.8 | 115.0
UNITED STATES | Advanced Materials & Structures Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 78.1 | 68.7
UNITED STATES | Engineered Papers Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 49.7 | 46.3
Europe and the former Commonwealth of Independent States [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 73.4 | 60.4
Europe and the former Commonwealth of Independent States [Member] | Advanced Materials & Structures Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 15.8 | 11.2
Europe and the former Commonwealth of Independent States [Member] | Engineered Papers Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 57.6 | 49.2
Segment, Geographical, Groups of Countries, Group Four [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 35.9 | 35.8
Segment, Geographical, Groups of Countries, Group Four [Member] | Advanced Materials & Structures Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 14.6 | 14.7
Segment, Geographical, Groups of Countries, Group Four [Member] | Engineered Papers Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 21.3 | 21.1
Segment, Geographical, Groups of Countries, Group Three [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 14.7 | 12.8
Segment, Geographical, Groups of Countries, Group Three [Member] | Advanced Materials & Structures Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 3.2 | 2.3
Segment, Geographical, Groups of Countries, Group Three [Member] | Engineered Papers Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 11.5 | 10.5
Other Foreign Countries [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 10.1 | 9.3
Other Foreign Countries [Member] | Advanced Materials & Structures Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 3.6 | 3.1
Other Foreign Countries [Member] | Engineered Papers Segment [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 6.5 | $ 6.2

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