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Intangible Assets | 12 Months Ended
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Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The gross carrying amount and accumulated amortization for intangible assets consisted of the following ($ in millions):
| December 31, 2015 |  | December 31, 2014
| Gross Carrying Amount |  | Accumulated Amortization* |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization* |  | Net Carrying Amount
Amortized intangible assets |  |  |  |  |  |  |  |  |  |  |
Engineered Papers
Customer-related intangibles | $ | 10.0 |  |  | $ | 10.0 |  |  | $ | — |  |  | $ | 10.0 |  |  | $ | 10.0 |  |  | $ | — |
Advanced Materials & Structures
Customer Relationships | 167.7 |  |  | 6.4 |  |  | 161.3 |  |  | 52.4 |  |  | 2.1 |  |  | 50.3 |
Developed Technology | 16.0 |  |  | 2.4 |  |  | 13.6 |  |  | 16.0 |  |  | 1.2 |  |  | 14.8 |
Customer Contracts | 0.9 |  |  | 0.5 |  |  | 0.4 |  |  | 0.9 |  |  | — |  |  | 0.9 |
Non-Compete Agreements | 1.7 |  |  | 0.1 |  |  | 1.6 |  |  | — |  |  | — |  |  | — |
Patents | 1.5 |  |  | 0.1 |  |  | 1.4 |  |  | 1.5 |  |  | — |  |  | 1.5 |
Total | $ | 197.8 |  |  | $ | 19.5 |  |  | $ | 178.3 |  |  | $ | 80.8 |  |  | $ | 13.3 |  |  | $ | 67.5 |
Unamortized intangible assets (Advanced Materials & Structures) |  |  |  |
Trade names | $ | 35.6 |  |  |  |  |  |  | $ | 21.8 |  |  |  |  |
* Accumulated amortization also includes adjustments for foreign currency translation. Amortization expense of intangible assets was $5.6 million, $3.1 million and $0.6 million and for the years ended December 31, 2015, 2014 and 2013, respectively. Finite-lived intangibles in the AMS segment are expensed using the straight-line amortization method. The following table shows the estimated aggregate amortization expense for the next five years ($ in millions):
For the year ended December 31, | Estimated Amortization Expense
2016 | $ | 12.3 |
2017 | 11.9 |
2018 | 11.9 |
2019 | 11.8 |
2020 | 11.5 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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