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Intangible Assets | 9 Months Ended
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Sep. 30, 2018
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):
| September 30, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairments |  | Accumulated Foreign Exchange |  | Net Carrying Amount
Amortized Intangible Assets |  |  |  |  |  |  |  |  |
Advanced Materials & Structures
Customer relationships | $ | 276.3 |  |  | $ | 46.0 |  |  | $ | — |  |  | $ | (0.2 | ) |  | $ | 230.5 |
Developed technology | 34.0 |  |  | 8.0 |  |  | — |  |  | 0.1 |  |  | 25.9 |
Trade names | 21.8 |  |  | 0.8 |  |  | 20.7 |  |  | 0.3 |  |  | — |
Non-compete agreements | 2.9 |  |  | 1.6 |  |  | — |  |  | — |  |  | 1.3 |
Patents | 1.5 |  |  | 0.3 |  |  | — |  |  | — |  |  | 1.2 |
Total | $ | 336.5 |  |  | $ | 56.7 |  |  | $ | 20.7 |  |  | $ | 0.2 |  |  | $ | 258.9 |
Unamortized Intangible Assets (Advanced Materials & Structures)
Trade names | $ | 20.0 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | (0.2 | ) |  | $ | 20.1 |
| December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairments |  | Accumulated Foreign Exchange |  | Net Carrying Amount
Amortized Intangible Assets |  |  |  |  |  |  |  |  |
Advanced Materials & Structures
Customer relationships | $ | 276.3 |  |  | $ | 32.9 |  |  | $ | — |  |  | $ | (2.3 | ) |  | $ | 245.7 |
Developed technology | 34.0 |  |  | 6.0 |  |  | — |  |  | (0.1 | ) |  | 28.1 |
Customer contracts | 0.9 |  |  | 0.9 |  |  | — |  |  | — |  |  | — |
Trade names | 21.8 |  |  | 0.8 |  |  | 20.7 |  |  | 0.3 |  |  | — |
Non-compete agreements | 2.9 |  |  | 1.1 |  |  | — |  |  | — |  |  | 1.8 |
Patents | 1.5 |  |  | 0.3 |  |  | — |  |  | — |  |  | 1.2 |
Total | $ | 337.4 |  |  | $ | 42.0 |  |  | $ | 20.7 |  |  | $ | (2.1 | ) |  | $ | 276.8 |
Unamortized Intangible Assets (Advanced Materials & Structures)
Trade names | $ | 20.0 |  |  | $ | — |  |  | $ | — |  |  | $ | (0.4 | ) |  | $ | 20.4 |
Amortization expense of intangible assets was $5.2 million and $5.2 million for the three months ended September 30, 2018 and 2017, respectively, and $15.6 million and $15.7 million for the nine months ended September 30, 2018 and 2017, respectively. Finite-lived intangibles in the AMS segment are expensed using the straight-line amortization method. The estimated average aggregate amortization expense is $20.3 million in each of the next five years.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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