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Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]          
Amortization expense of intangible assets $ 5.2 $ 3.0 $ 15.7 $ 9.2  
Estimated Amortization Expense          
Estimated average amortization expense in each of next five years 20.4   20.4    
Advanced Materials & Structures [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 337.4   337.4   $ 220.1
Accumulated Amortization 36.8   36.8   31.1
Accumulated Impairments 20.7   20.7   20.7
Accumulated Foreign Exchange (0.9)   (0.9)   3.8
Net Carrying Amount 280.8   280.8   164.5
Advanced Materials & Structures [Member] | Trade names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Accumulated Impairments 0.0   0.0   0.0
Accumulated Foreign Exchange (0.3)   (0.3)   (0.1)
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross 20.0   20.0   12.9
Indefinite-Lived Intangible Assets (Excluding Goodwill) 20.3   20.3   13.0
Advanced Materials & Structures [Member] | Customer relationships [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 276.3   276.3   168.3
Accumulated Amortization 28.5   28.5   15.9
Accumulated Impairments 0.0   0.0   0.0
Accumulated Foreign Exchange (1.2)   (1.2)   3.1
Net Carrying Amount 249.0   249.0   149.3
Advanced Materials & Structures [Member] | Developed technology [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 34.0   34.0   15.9
Accumulated Amortization 5.4   5.4   3.6
Accumulated Impairments 0.0   0.0   0.0
Accumulated Foreign Exchange 0.0   0.0   0.4
Net Carrying Amount 28.6   28.6   11.9
Advanced Materials & Structures [Member] | Customer contracts [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 0.9   0.9   0.9
Accumulated Amortization 0.9   0.9   0.9
Accumulated Impairments 0.0   0.0   0.0
Accumulated Foreign Exchange 0.0   0.0   0.0
Net Carrying Amount 0.0   0.0   0.0
Advanced Materials & Structures [Member] | Trade names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 21.8   21.8   21.8
Accumulated Amortization 0.8   0.8   0.0
Accumulated Impairments 20.7   20.7   20.7
Accumulated Foreign Exchange 0.3   0.3   0.3
Net Carrying Amount 0.0   0.0   0.8
Advanced Materials & Structures [Member] | Non-compete agreements [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 2.9   2.9   1.7
Accumulated Amortization 1.0   1.0   0.5
Accumulated Impairments 0.0   0.0   0.0
Accumulated Foreign Exchange 0.0   0.0   0.0
Net Carrying Amount 1.9   1.9   1.2
Advanced Materials & Structures [Member] | Patents [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 1.5   1.5   1.5
Accumulated Amortization 0.2   0.2   0.2
Accumulated Impairments 0.0   0.0   0.0
Accumulated Foreign Exchange 0.0   0.0   0.0
Net Carrying Amount 1.3   1.3   1.3
Engineered Papers [Member] | Customer relationships [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
Net Carrying Amount         $ 0.0
Conwed Plastics LLC [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortization expense of intangible assets $ 2.2   $ 6.0