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Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount $ 197.8   $ 197.8   $ 197.8
Accumulated Amortization 29.9   29.9   19.5
Net Carrying Amount 167.9   167.9   178.3
Amortization expense of intangible assets 3.0 $ 1.1 9.2 $ 3.2  
Estimated Amortization Expense          
Estimated average amortization expense in each of next five years 11.6   11.6    
Trade names [Member] | Advanced Materials & Structures Segment [Member]          
Indefinite-lived Intangible Assets [Line Items]          
Unamortized intangible assets 35.6   35.6   35.6
Customer-Related Intangibles [Member] | Engineered Papers Segment [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 10.0   10.0   10.0
Accumulated Amortization 10.0   10.0   10.0
Net Carrying Amount 0.0   0.0   0.0
Customer relationships [Member] | Advanced Materials & Structures Segment [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 167.7   167.7   167.7
Accumulated Amortization 14.8   14.8   6.4
Net Carrying Amount 152.9   152.9   161.3
Developed Technology Rights [Member] | Advanced Materials & Structures Segment [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 16.0   16.0   16.0
Accumulated Amortization 3.7   3.7   2.4
Net Carrying Amount 12.3   12.3   13.6
Customer Contracts [Member] | Advanced Materials & Structures Segment [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 0.9   0.9   0.9
Accumulated Amortization 0.8   0.8   0.5
Net Carrying Amount 0.1   0.1   0.4
Non-Compete Agreements [Member] | Advanced Materials & Structures Segment [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 1.7   1.7   1.7
Accumulated Amortization 0.4   0.4   0.1
Net Carrying Amount 1.3   1.3   1.6
Patents [Member] | Advanced Materials & Structures Segment [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 1.5   1.5   1.5
Accumulated Amortization 0.2   0.2   0.1
Net Carrying Amount $ 1.3   $ 1.3   $ 1.4