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Goodwill - Carrying Amount of Goodwill By Segment (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
reportable_unit
Dec. 31, 2016
USD ($)
Goodwill [Line Items]    
Number of reportable units with goodwill | reportable_unit 2  
Goodwill [Roll Forward]    
Goodwill beginning of period, net $ 229,500,000 $ 233,300,000
Goodwill acquired during the year 106,200,000  
Goodwill, Purchase Accounting Adjustments   (200,000)
Foreign currency translation adjustments 5,600,000 (3,600,000)
Goodwill end of period, net 341,300,000 229,500,000
Engineered Papers [Member]    
Goodwill [Line Items]    
Accumulated impairment losses 2,700,000  
Goodwill [Roll Forward]    
Goodwill beginning of period, net 4,700,000 4,800,000
Goodwill acquired during the year 0  
Goodwill, Purchase Accounting Adjustments   0
Foreign currency translation adjustments 500,000 (100,000)
Goodwill end of period, net 5,200,000 4,700,000
Advanced Materials & Structures [Member]    
Goodwill [Line Items]    
Accumulated impairment losses 0  
Goodwill [Roll Forward]    
Goodwill beginning of period, net 224,800,000 228,500,000
Goodwill acquired during the year 106,200,000  
Goodwill, Purchase Accounting Adjustments   (200,000)
Foreign currency translation adjustments 5,100,000 (3,500,000)
Goodwill end of period, net $ 336,100,000 $ 224,800,000