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Intangible Assets | 12 Months Ended
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Dec. 31, 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):
| 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 |
| 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 $20.7 million, $20.9 million and $12.3 million for the years ended December 31, 2018, 2017 and 2016, respectively. Finite-lived intangibles in the AMS segment are expensed using the straight-line amortization method. In our AMS segment, the Company made a strategic decision to transition away from certain legacy business trade names associated with its recent acquisitions in favor of a streamlined SWM branding approach. As a result of adopting this branding strategy, in the fourth quarter of 2016, the Company recognized an impairment expense of $20.7 million, representing a write-down of the DelStar trade name intangible asset to its fair market value, leaving a remaining balance of $0.8 million, which was fully amortized over the first six months of 2017, as the DelStar trade name was phased out. The following table shows the estimated aggregate amortization expense for the next five years ($ in millions):
For the year ending December 31, | Estimated Amortization Expense
2019 | $ | 20.4 |
2020 | 20.0 |
2021 | 20.0 |
2022 | 20.0 |
2023 | 19.7 |

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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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