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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets Goodwill The changes in the carrying amount of goodwill for the period ending December 31, 2023, by operating segment, were as follows:
(Dollars in millions) | Advanced Electronics Solutions |  | Elastomeric Material Solutions |  | Other |  | Total
December 31, 2022 | $ | 115.4 |  |  | $ | 234.8 |  |  | $ | 2.2 |  |  | $ | 352.4 |
Foreign currency translation adjustment | 2.3 |  |  | 5.1 |  |  | — |  |  | 7.4 |
December 31, 2023 | $ | 117.7 |  |  | $ | 239.9 |  |  | $ | 2.2 |  |  | $ | 359.8 |
Other Intangible Assets The carrying amount of other intangible assets were as follows:
| December 31, 2023 |  | December 31, 2022
(Dollars in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | $ | 177.9 |  |  | $ | 90.0 |  |  | $ | 87.9 |  |  | $ | 178.6 |  |  | $ | 85.6 |  |  | $ | 93.0 |
Technology | 77.4 |  |  | 58.1 |  |  | 19.3 |  |  | 82.4 |  |  | 59.1 |  |  | 23.3 |
Trademarks and trade names | 19.4 |  |  | 7.4 |  |  | 12.0 |  |  | 19.1 |  |  | 6.6 |  |  | 12.5 |
Covenants not to compete | 1.3 |  |  | 0.9 |  |  | 0.4 |  |  | 1.9 |  |  | 1.2 |  |  | 0.7 |
Total definite-lived other intangible assets | 276.0 |  |  | 156.4 |  |  | 119.6 |  |  | 282.0 |  |  | 152.5 |  |  | 129.5 |
Indefinite-lived other intangible asset | 4.3 |  |  | — |  |  | 4.3 |  |  | 4.2 |  |  | — |  |  | 4.2 |
Total other intangible assets | $ | 280.3 |  |  | $ | 156.4 |  |  | $ | 123.9 |  |  | $ | 286.2 |  |  | $ | 152.5 |  |  | $ | 133.7 |
In the table above, gross carrying amounts and accumulated amortization may differ from prior periods due to foreign exchange rate fluctuations. Amortization expense was $13.4 million, $16.4 million and $14.3 million in 2023, 2022 and 2021, respectively. Additionally, in 2022, we impaired $17.9 million of customer relationships, technology and trademarks and trade names definite-lived other intangible assets related to our high-performance engineered cellular elastomer business. For additional information related to the impairment charges, refer to “Note 14 – Supplemental Financial Information.” The estimated annual future amortization expense is $12.4 million, $10.8 million, $10.4 million, $10.0 million and $7.8 million in 2024, 2025, 2026, 2027 and 2028, respectively. These amounts could vary based on changes in foreign currency exchange rates. The weighted average amortization period as of December 31, 2023, by definite-lived other intangible asset class, is presented in the table below:
Definite-Lived Other Intangible Asset Class | Weighted Average Remaining Amortization Period
Customer relationships | 7.4 years
Technology | 3.3 years
Trademarks and trade names | 10.0 years
Covenants not to compete | 0.5 years
Total definite-lived other intangible assets | 7.0 years

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