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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | The gross carrying amount and accumulated amortization for intangible assets consisted of the following ($ in millions):
| December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Impairments |  | Foreign Exchange |  | Net Carrying Amount
Amortized Intangible Assets |  |  |  |  |  |  |  |  |
Engineered Papers
Customer-related intangibles | $ | 10.0 |  |  | $ | 10.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Advanced Materials & Structures
Customer relationships | 168.3 |  |  | 15.9 |  |  | — |  |  | 3.1 |  |  | 149.3 |
Developed technology | 15.9 |  |  | 3.6 |  |  | — |  |  | 0.4 |  |  | 11.9 |
Customer contracts | 0.9 |  |  | 0.9 |  |  | — |  |  | — |  |  | — |
Trade names | 21.8 |  |  | — |  |  | 20.7 |  |  | 0.3 |  |  | 0.8 |
Non-compete agreements | 1.7 |  |  | 0.5 |  |  | — |  |  | — |  |  | 1.2 |
Patents | 1.5 |  |  | 0.2 |  |  | — |  |  | — |  |  | 1.3 |
Total | $ | 220.1 |  |  | $ | 31.1 |  |  | $ | 20.7 |  |  | $ | 3.8 |  |  | $ | 164.5 |
Unamortized Intangible Assets (Advanced Materials & Structures)
Trade names | $ | 12.9 |  |  | $ | — |  |  | $ | — |  |  | $ | (0.1 | ) |  | $ | 13.0 |
Schedule of Future Amortization Expense | 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
2017 | $ | 12.6 |
2018 | 11.8 |
2019 | 11.7 |
2020 | 11.3 |
2021 | 11.3 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived 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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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