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Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 270.4 | $ 255.3 | $ 532.3 | $ 488.6
Product Revenues [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 254.2 | 229.9 | 483.4 | 434.5
Material Conversion Revenues [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 13.7 | 23.6 | 44.6 | 50.8
Other Revenues [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 2.5 | 1.8 | 4.3 | 3.3
Advanced Materials & Structures Segment [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 124.0 | 117.8 | 239.3 | 217.8
Advanced Materials & Structures Segment [Member] | Product Revenues [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 120.6 | 114.7 | 229.0 | 206.0
Advanced Materials & Structures Segment [Member] | Material Conversion Revenues [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 2.2 | 2.6 | 8.4 | 10.8
Advanced Materials & Structures Segment [Member] | Other Revenues [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1.2 | 0.5 | 1.9 | 1.0
Engineered Papers Segment [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 146.4 | 137.5 | 293.0 | 270.8
Engineered Papers Segment [Member] | Product Revenues [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 133.6 | 115.2 | 254.4 | 228.5
Engineered Papers Segment [Member] | Material Conversion Revenues [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 11.5 | 21.0 | 36.2 | 40.0
Engineered Papers Segment [Member] | Other Revenues [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1.3 | 1.3 | 2.4 | 2.3
UNITED STATES |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 134.8 | 125.4 | 262.6 | 240.4
UNITED STATES | Advanced Materials & Structures Segment [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 84.8 | 78.3 | 162.9 | 147.0
UNITED STATES | Engineered Papers Segment [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 50.0 | 47.1 | 99.7 | 93.4
Europe and the former Commonwealth of Independent States [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 70.7 | 66.0 | 144.1 | 126.4
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 | 10.7 | 12.9 | 26.5 | 24.1
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 | 60.0 | 53.1 | 117.6 | 102.3
Segment, Geographical, Groups of Countries, Group Four [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 39.9 | 37.1 | 75.8 | 72.9
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 | 22.0 | 19.7 | 36.6 | 34.4
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 | 17.9 | 17.4 | 39.2 | 38.5
Segment, Geographical, Groups of Countries, Group Three [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 13.0 | 14.0 | 27.7 | 26.8
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 | 2.5 | 3.1 | 5.7 | 5.4
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 | 10.5 | 10.9 | 22.0 | 21.4
Other Foreign Countries [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 12.0 | 12.8 | 22.1 | 22.1
Other Foreign Countries [Member] | Advanced Materials & Structures Segment [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 4.0 | 3.8 | 7.6 | 6.9
Other Foreign Countries [Member] | Engineered Papers Segment [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 8.0 | $ 9.0 | $ 14.5 | $ 15.2

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