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Goodwill - Carrying Amount of Goodwill By Segment (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
reportable_unit
Dec. 31, 2015
USD ($)
Goodwill [Line Items]    
Number of reportable units with goodwill | reportable_unit 2  
Goodwill [Roll Forward]    
Goodwill beginning of period, net $ 233,300,000 $ 126,100,000
Goodwill adjusted during the year   109,500,000
Goodwill, Purchase Accounting Adjustments (200,000)  
Foreign currency translation adjustments (3,600,000) (2,300,000)
Goodwill end of period, net 229,500,000 233,300,000
Engineered Papers [Member]    
Goodwill [Line Items]    
Accumulated impairment losses 2,700,000  
Goodwill [Roll Forward]    
Goodwill beginning of period, net 4,800,000 5,300,000
Goodwill adjusted during the year   0
Goodwill, Purchase Accounting Adjustments 0  
Foreign currency translation adjustments (100,000) (500,000)
Goodwill end of period, net 4,700,000 4,800,000
Advanced Materials & Structures [Member]    
Goodwill [Line Items]    
Accumulated impairment losses 0  
Goodwill [Roll Forward]    
Goodwill beginning of period, net 228,500,000 120,800,000
Goodwill adjusted during the year   109,500,000
Goodwill, Purchase Accounting Adjustments (200,000)  
Foreign currency translation adjustments (3,500,000) (1,800,000)
Goodwill end of period, net $ 224,800,000 $ 228,500,000