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Goodwill and Other Intangible Assets | 3 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets 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 |
Foreign currency translation adjustment | 2.6 |  |  | 3.2 |  |  | — |  |  | 5.8 |
March 31, 2025 | $ | 116.2 |  |  | $ | 245.0 |  |  | $ | 2.2 |  |  | $ | 363.4 |
Other Intangible Assets The carrying amount of other intangible assets were as follows:
| March 31, 2025 |  | December 31, 2024
(Dollars in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | $ | 177.9 |  |  | $ | 98.6 |  |  | $ | 79.3 |  |  | $ | 175.9 |  |  | $ | 96.1 |  |  | $ | 79.8 |
Technology | 76.9 |  |  | 62.5 |  |  | 14.4 |  |  | 75.6 |  |  | 60.6 |  |  | 15.0 |
Trademarks and trade names | 19.5 |  |  | 7.9 |  |  | 11.6 |  |  | 19.1 |  |  | 7.7 |  |  | 11.4 |
Total definite-lived other intangible assets | 274.3 |  |  | 169.0 |  |  | 105.3 |  |  | 270.6 |  |  | 164.4 |  |  | 106.2 |
Indefinite-lived other intangible asset | 4.3 |  |  | — |  |  | 4.3 |  |  | 4.1 |  |  | — |  |  | 4.1 |
Total other intangible assets | $ | 278.6 |  |  | $ | 169.0 |  |  | $ | 109.6 |  |  | $ | 274.7 |  |  | $ | 164.4 |  |  | $ | 110.3 |
In the table above, gross carrying amounts and accumulated amortization may differ from prior periods due to foreign exchange rate fluctuations. The amortization expense related to other intangible assets was as follows:
| Three Months Ended |  |
(Dollars in millions) | March 31, 2025 |  | March 31, 2024 |  |  |  |
Amortization expense | $ | 2.7 |  |  | $ | 3.1 |  |  |  |  |
The estimated future amortization expense is $8.2 million, $10.5 million, $10.1 million, $7.9 million, and $7.4 million in 2025, 2026, 2027, 2028, and 2029, respectively. These amounts could vary based on changes in foreign currency exchange rates. The weighted average amortization period as of March 31, 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 |  | 3.0 years
Trademarks and trade names |  | 9.2 years
Total definite-lived other intangible assets |  | 6.6 years

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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