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Intangible Assets | 3 Months Ended
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Mar. 31, 2019
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):
| March 31, 2019
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairments |  | Accumulated Foreign Exchange |  | Net Carrying Amount
Amortized Intangible Assets |  |  |  |  |  |  |  |  |
Advanced Materials & Structures
Customer relationships | $ | 276.3 |  |  | $ | 54.7 |  |  | $ | — |  |  | $ | 1.6 |  |  | $ | 220.0 |
Developed technology | 34.0 |  |  | 9.1 |  |  | — |  |  | 0.3 |  |  | 24.6 |
Trade names | 21.8 |  |  | 0.8 |  |  | 20.7 |  |  | 0.3 |  |  | — |
Non-compete agreements | 2.9 |  |  | 1.9 |  |  | — |  |  | — |  |  | 1.0 |
Patents | 1.5 |  |  | 0.4 |  |  | — |  |  | — |  |  | 1.1 |
Total | $ | 336.5 |  |  | $ | 66.9 |  |  | $ | 20.7 |  |  | $ | 2.2 |  |  | $ | 246.7 |
Unamortized Intangible Assets (Advanced Materials & Structures)
Trade names | $ | 20.0 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 19.9 |
| December 31, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairments |  | Accumulated Foreign Exchange |  | Net Carrying Amount
Amortized Intangible Assets |  |  |  |  |  |  |  |  |
Advanced Materials & Structures
Customer relationships | $ | 276.3 |  |  | $ | 50.4 |  |  | $ | — |  |  | $ | 0.7 |  |  | $ | 225.2 |
Developed technology | 34.0 |  |  | 8.5 |  |  | — |  |  | 0.2 |  |  | 25.3 |
Trade names | 21.8 |  |  | 0.8 |  |  | 20.7 |  |  | 0.3 |  |  | — |
Non-compete agreements | 2.9 |  |  | 1.7 |  |  | — |  |  | — |  |  | 1.2 |
Patents | 1.5 |  |  | 0.4 |  |  | — |  |  | — |  |  | 1.1 |
Total | $ | 336.5 |  |  | $ | 61.8 |  |  | $ | 20.7 |  |  | $ | 1.2 |  |  | $ | 252.8 |
Unamortized Intangible Assets (Advanced Materials & Structures)
Trade names | $ | 20.0 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | (0.1 | ) |  | $ | 20.0 |
Amortization expense of intangible assets was $5.1 million and $5.2 million for the three months ended March 31, 2019 and 2018, respectively. Finite-lived intangibles in the AMS segment are expensed using the straight-line amortization method. The estimated average aggregate amortization expense is $20.1 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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