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Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 336.5 $ 337.4  
Accumulated Amortization 61.8 42.0  
Accumulated Impairments 20.7 20.7  
Accumulated Foreign Exchange 1.2 (2.1)  
Net Carrying Amount 252.8 276.8  
Amortization expense of intangible assets 20.7 20.9 $ 12.3
Estimated Amortization Expense      
2019 20.4    
2020 20.0    
2021 20.0    
2022 20.0    
2023 19.7    
Trade names | Advanced Materials & Structures      
Finite-Lived Intangible Assets [Line Items]      
Accumulated Impairments 0.1 0.0  
Accumulated Foreign Exchange (0.1) (0.4)  
Unamortized Intangible Assets (Advanced Materials & Structures), Gross Carrying Amount 20.0 20.0  
Unamortized Intangible Assets (Advanced Materials & Structures), Net Carrying Amount 20.0 20.4  
Customer relationships | Advanced Materials & Structures      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 276.3 276.3  
Accumulated Amortization 50.4 32.9  
Accumulated Impairments 0.0 0.0  
Accumulated Foreign Exchange 0.7 (2.3)  
Net Carrying Amount 225.2 245.7  
Developed technology | Advanced Materials & Structures      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 34.0 34.0  
Accumulated Amortization 8.5 6.0  
Accumulated Impairments 0.0 0.0  
Accumulated Foreign Exchange 0.2 (0.1)  
Net Carrying Amount 25.3 28.1  
Customer contracts | Advanced Materials & Structures      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount   0.9  
Accumulated Amortization   0.9  
Accumulated Impairments   0.0  
Accumulated Foreign Exchange   0.0  
Net Carrying Amount   0.0  
Trade names | Advanced Materials & Structures      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 21.8 21.8 0.8
Accumulated Amortization 0.8 0.8  
Accumulated Impairments 20.7 20.7  
Accumulated Foreign Exchange 0.3 0.3  
Net Carrying Amount 0.0 0.0  
Impairment expenses     $ 20.7
Non-compete agreements | Advanced Materials & Structures      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 2.9 2.9  
Accumulated Amortization 1.7 1.1  
Accumulated Impairments 0.0 0.0  
Accumulated Foreign Exchange 0.0 0.0  
Net Carrying Amount 1.2 1.8  
Patents | Advanced Materials & Structures      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 1.5 1.5  
Accumulated Amortization 0.4 0.3  
Accumulated Impairments 0.0 0.0  
Accumulated Foreign Exchange 0.0 0.0  
Net Carrying Amount $ 1.1 $ 1.2