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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the net carrying amount of goodwill by operating segment were as follows:
(Dollars in millions) | Advanced Electronics Solutions |  | Elastomeric Material Solutions |  | Other |  | Total
December 31, 2023 | $ | 117.7 |  |  | $ | 239.9 |  |  | $ | 2.2 |  |  | $ | 359.8 |
Foreign currency translation adjustment | 0.6 |  |  | 5.3 |  |  | — |  |  | $ | 5.9 |
September 30, 2024 | $ | 118.3 |  |  | $ | 245.2 |  |  | $ | 2.2 |  |  | $ | 365.7 |
Schedule of Intangible Assets | The carrying amount of other intangible assets were as follows:
| September 30, 2024 |  | December 31, 2023
(Dollars in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | $ | 180.5 |  |  | $ | 96.0 |  |  | $ | 84.5 |  |  | $ | 177.9 |  |  | $ | 90.0 |  |  | $ | 87.9 |
Technology | 78.1 |  |  | 61.7 |  |  | 16.4 |  |  | 77.4 |  |  | 58.1 |  |  | 19.3 |
Trademarks and trade names | 20.1 |  |  | 7.8 |  |  | 12.3 |  |  | 19.4 |  |  | 7.4 |  |  | 12.0 |
Covenants not to compete | 1.3 |  |  | 1.2 |  |  | 0.1 |  |  | 1.3 |  |  | 0.9 |  |  | 0.4 |
Total definite-lived other intangible assets | 280.0 |  |  | 166.7 |  |  | 113.3 |  |  | 276.0 |  |  | 156.4 |  |  | 119.6 |
Indefinite-lived other intangible asset | 4.4 |  |  | — |  |  | 4.4 |  |  | 4.3 |  |  | — |  |  | 4.3 |
Total other intangible assets | $ | 284.4 |  |  | $ | 166.7 |  |  | $ | 117.7 |  |  | $ | 280.3 |  |  | $ | 156.4 |  |  | $ | 123.9 |
Schedule of Weighted Average Amortization Period, by Intangible Asset Class | The weighted average amortization period as of September 30, 2024, by definite-lived other intangible asset class, is presented in the table below:
|  | Weighted Average Remaining Amortization Period
Customer relationships |  | 7.1 years
Technology |  | 3.1 years
Trademarks and trade names |  | 9.5 years
Covenants not to compete |  | 0.1 years
Total definite-lived other intangible assets |  | 6.8 years

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