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Goodwill (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Goodwill impairment | $ 0 | $ 0 | $ 0 |  |
Number of reportable segments | segment |  |  |  | 2 |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill beginning of period |  |  |  | $ 341,300,000 | $ 229,500,000
Goodwill acquired during the year |  |  |  |  | 106,200,000
Foreign currency translation adjustments |  |  |  | (3,200,000) | 5,600,000
Goodwill end of period | 338,100,000 | 341,300,000 | 229,500,000 | 338,100,000 | 341,300,000
Engineered Papers |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment losses | 2,700,000 |  |  | 2,700,000 |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill beginning of period |  |  |  | 5,200,000 | 4,700,000
Goodwill acquired during the year |  |  |  |  | 0
Foreign currency translation adjustments |  |  |  | (200,000) | 500,000
Goodwill end of period | 5,000,000 | 5,200,000 | 4,700,000 | 5,000,000 | 5,200,000
Advanced Materials & Structures |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment losses | 0 |  |  | 0 |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill beginning of period |  |  |  | 336,100,000 | 224,800,000
Goodwill acquired during the year |  |  |  |  | 106,200,000
Foreign currency translation adjustments |  |  |  | (3,000,000) | 5,100,000
Goodwill end of period | $ 333,100,000 | $ 336,100,000 | $ 224,800,000 | $ 333,100,000 | $ 336,100,000

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