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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2025
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, 2024 | $ | 113.6 |  |  | $ | 241.8 |  |  | $ | 2.2 |  |  | $ | 357.6 |
Impairment | (67.3) |  |  | — |  |  | — |  |  | (67.3) |
Foreign currency translation adjustment | 5.4 |  |  | 10.2 |  |  | — |  |  | 15.6 |
June 30, 2025 | $ | 51.7 |  |  | $ | 252.0 |  |  | $ | 2.2 |  |  | $ | 305.9 |
Schedule of Intangible Assets | The carrying amount of other intangible assets were as follows:
| June 30, 2025 |  | December 31, 2024
(Dollars in millions) | Gross Carrying Amount |  | Accumulated Impairment |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | $ | 182.0 |  |  | $ | — |  |  | $ | 102.2 |  |  | $ | 79.8 |  |  | $ | 175.9 |  |  | $ | 96.1 |  |  | $ | 79.8 |
Technology | 79.6 |  |  | — |  |  | 65.8 |  |  | 13.8 |  |  | 75.6 |  |  | 60.6 |  |  | 15.0 |
Trademarks and trade names | 20.3 |  |  | — |  |  | 8.1 |  |  | 12.2 |  |  | 19.1 |  |  | 7.7 |  |  | 11.4 |
Total definite-lived other intangible assets | 281.9 |  |  | — |  |  | 176.1 |  |  | 105.8 |  |  | 270.6 |  |  | 164.4 |  |  | 106.2 |
Indefinite-lived other intangible asset | 4.5 |  |  | 4.5 |  |  | — |  |  | — |  |  | 4.1 |  |  | — |  |  | 4.1 |
Total other intangible assets | $ | 286.4 |  |  | $ | 4.5 |  |  | $ | 176.1 |  |  | $ | 105.8 |  |  | $ | 274.7 |  |  | $ | 164.4 |  |  | $ | 110.3 |
The amortization expense related to other intangible assets was as follows:
| Three Months Ended |  | Six Months Ended
(Dollars in millions) | June 30, 2025 |  | June 30, 2024 |  | June 30, 2025 |  | June 30, 2024
Amortization expense | $ | 2.7 |  |  | $ | 3.1 |  |  | $ | 5.4 |  |  | $ | 6.2 |
Schedule of Weighted Average Amortization Period, by Intangible Asset Class | The weighted average amortization period as of June 30, 2025, by definite-lived other intangible asset class, is presented in the table below:
|  | Weighted Average Remaining Amortization Period
Customer relationships |  | 6.9 years
Technology |  | 2.9 years
Trademarks and trade names |  | 9.0 years
Total definite-lived other intangible assets |  | 6.6 years

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