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Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 337.4 $ 220.1  
Accumulated Amortization 42.0 31.1  
Accumulated Impairments 20.7 20.7  
Accumulated Foreign Exchange (2.1) 3.8  
Net Carrying Amount 276.8 164.5  
Amortization expense of intangible assets 20.9 12.3 $ 5.6
Estimated Amortization Expense      
2018 20.7    
2019 20.6    
2020 20.3    
2021 20.3    
2022 20.2    
Trade names [Member] | Advanced Materials & Structures [Member]      
Finite-Lived Intangible Assets [Line Items]      
Accumulated Impairments 0.0 0.0  
Accumulated Foreign Exchange (0.4) (0.1)  
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross 20.0 12.9  
Estimated Amortization Expense      
Indefinite-Lived Intangible Assets (Excluding Goodwill) 20.4 13.0  
Customer-related intangibles [Member] | Engineered Papers [Member]      
Finite-Lived Intangible Assets [Line Items]      
Net Carrying Amount   0.0  
Customer Relationships [Member] | Engineered Papers [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount   10.0  
Accumulated Amortization   10.0  
Accumulated Impairments   0.0  
Accumulated Foreign Exchange   0.0  
Customer Relationships [Member] | Advanced Materials & Structures [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 276.3 168.3  
Accumulated Amortization 32.9 15.9  
Accumulated Impairments 0.0 0.0  
Accumulated Foreign Exchange (2.3) 3.1  
Net Carrying Amount 245.7 149.3  
Developed Technology [Member] | Advanced Materials & Structures [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 34.0 15.9  
Accumulated Amortization 6.0 3.6  
Accumulated Impairments 0.0 0.0  
Accumulated Foreign Exchange (0.1) 0.4  
Net Carrying Amount 28.1 11.9  
Customer Contracts [Member] | Advanced Materials & Structures [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 0.9 0.9  
Accumulated Amortization 0.9 0.9  
Accumulated Impairments 0.0 0.0  
Accumulated Foreign Exchange 0.0 0.0  
Net Carrying Amount 0.0 0.0  
Trade names [Member] | Advanced Materials & Structures [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 21.8 21.8  
Accumulated Amortization 0.8 0.0  
Accumulated Impairments 20.7 20.7  
Accumulated Foreign Exchange 0.3 0.3  
Net Carrying Amount 0.0 0.8  
Amortized Intangible Assets, Impairments   20.7  
Non-competition agreements [Member] | Advanced Materials & Structures [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 2.9 1.7  
Accumulated Amortization 1.1 0.5  
Accumulated Impairments 0.0 0.0  
Accumulated Foreign Exchange 0.0 0.0  
Net Carrying Amount 1.8 1.2  
Patents [Member] | Advanced Materials & Structures [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 1.5 1.5  
Accumulated Amortization 0.3 0.2  
Accumulated Impairments 0.0 0.0  
Accumulated Foreign Exchange 0.0 0.0  
Net Carrying Amount 1.2 $ 1.3  
Conwed Plastics LLC [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense of intangible assets $ 8.2