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Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | $ 197.8 |  | $ 197.8 |  | $ 197.8
Accumulated Amortization | 26.5 |  | 26.5 |  | 19.5
Net Carrying Amount | 171.3 |  | 171.3 |  | 178.3
Amortization expense of intangible assets | 3.1 | $ 1.0 | 6.2 | $ 2.1 |
Estimated Amortization Expense |  |  |  |  |
Estimated average amortization expense in each of next five years | 11.7 |  | 11.7 |  |
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 | 12.2 |  | 12.2 |  | 6.4
Net Carrying Amount | 155.5 |  | 155.5 |  | 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 | 3.2 |  | 3.2 |  | 2.4
Net Carrying Amount | 12.8 |  | 12.8 |  | 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 | 0.7 |  | 0.7 |  | 0.5
Net Carrying Amount | 0.2 |  | 0.2 |  | 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 | 0.3 |  | 0.3 |  | 0.1
Net Carrying Amount | 1.4 |  | 1.4 |  | 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 | 0.1 |  | 0.1 |  | 0.1
Net Carrying Amount | $ 1.4 |  | $ 1.4 |  | $ 1.4

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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