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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