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Goodwill - Carrying Amount of Goodwill By Segment (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
reportable_unit
Dec. 31, 2014
USD ($)
Goodwill [Line Items]    
Number of reportable units with goodwill | reportable_unit 2  
Goodwill [Roll Forward]    
Goodwill beginning of period, net $ 126,100,000 $ 121,100,000
Goodwill acquired during the year 109,500,000 5,600,000
Foreign currency translation adjustments (2,300,000) (600,000)
Goodwill end of period, net 233,300,000 126,100,000
Engineered Papers [Member]    
Goodwill [Line Items]    
Accumulated impairment losses 2,700,000  
Goodwill [Roll Forward]    
Goodwill beginning of period, net 5,300,000 6,000,000
Goodwill acquired during the year 0 0
Foreign currency translation adjustments (500,000) (700,000)
Goodwill end of period, net 4,800,000 5,300,000
Advanced Materials & Structures [Member]    
Goodwill [Line Items]    
Accumulated impairment losses 0  
Goodwill [Roll Forward]    
Goodwill beginning of period, net 120,800,000 115,100,000
Goodwill acquired during the year 109,500,000 5,600,000
Foreign currency translation adjustments (1,800,000) 100,000
Goodwill end of period, net $ 228,500,000 $ 120,800,000