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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2026
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, 2025 | $ | 51.7 |  |  | $ | 249.5 |  |  | $ | 2.2 |  |  | $ | 303.4 |
Foreign currency translation adjustment | — |  |  | (2.2) |  |  | — |  |  | (2.2) |
March 31, 2026 | $ | 51.7 |  |  | $ | 247.3 |  |  | $ | 2.2 |  |  | $ | 301.2 |
Schedule of Intangible Assets | The carrying amount of intangible assets were as follows:
| March 31, 2026 |  | December 31, 2025
(Dollars in millions) | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Impairment |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | $ | 179.8 |  |  |  | $ | 106.9 |  |  | $ | 72.9 |  |  | $ | 180.9 |  |  | $ | — |  |  | $ | 105.6 |  |  | $ | 75.3 |
Technology | 78.7 |  |  |  | 67.2 |  |  | 11.5 |  |  | 79.4 |  |  | — |  |  | 67.2 |  |  | 12.2 |
Trademarks and trade names | 19.8 |  |  |  | 8.4 |  |  | 11.4 |  |  | 20.1 |  |  | — |  |  | 8.3 |  |  | 11.8 |
Total definite-lived intangible assets | 278.3 |  |  |  | 182.5 |  |  | 95.8 |  |  | 280.4 |  |  | — |  |  | 181.1 |  |  | 99.3 |
Indefinite-lived intangible asset | — |  |  |  | — |  |  | — |  |  | 4.5 |  |  | 4.5 |  |  | — |  |  | — |
Total intangible assets | $ | 278.3 |  |  |  | $ | 182.5 |  |  | $ | 95.8 |  |  | $ | 284.9 |  |  | $ | 4.5 |  |  | $ | 181.1 |  |  | $ | 99.3 |
The amortization expense related to intangible assets was as follows:
| Three Months Ended |  |
(Dollars in millions) | March 31, 2026 |  | March 31, 2025 |  |  |  |
Amortization expense | $ | 2.7 |  |  | $ | 2.7 |  |  |  |  |
Schedule of Weighted Average Amortization Period, by Intangible Asset Class | The weighted average amortization period as of March 31, 2026, by intangible asset class, is presented in the table below:
|  | Weighted Average Remaining Amortization Period
Customer relationships |  | 6.6 years
Technology |  | 2.6 years
Trademarks and trade names |  | 8.5 years
Total intangible assets |  | 6.3 years

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