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Goodwill and Other Intangible Assets
6 Months Ended
Jun. 30, 2024
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 SolutionsElastomeric Material SolutionsOtherTotal
December 31, 2023$117.7 $239.9 $2.2 $359.8 
Foreign currency translation adjustment(2.1)(1.4)— $(3.5)
June 30, 2024$115.6 $238.5 $2.2 $356.3 
Other Intangible Assets
The carrying amount of other intangible assets were as follows:
June 30, 2024December 31, 2023
(Dollars in millions)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer relationships$176.9 $93.0 $83.9 $177.9 $90.0 $87.9 
Technology76.5 59.4 17.1 77.4 58.1 19.3 
Trademarks and trade names19.3 7.5 11.8 19.4 7.4 12.0 
Covenants not to compete1.3 1.1 0.2 1.3 0.9 0.4 
Total definite-lived other intangible assets274.0 161.0 113.0 276.0 156.4 119.6 
Indefinite-lived other intangible asset4.2  4.2 4.3 — 4.3 
Total other intangible assets$278.2 $161.0 $117.2 $280.3 $156.4 $123.9 
In the table above, gross carrying amounts and accumulated amortization may differ from prior periods due to foreign exchange rate fluctuations.
Amortization expense was $3.1 million and $3.4 million for the three months ended June 30, 2024 and 2023, respectively and $6.2 million and $6.7 million for the six months ended June 30, 2024 and 2023, respectively. The estimated future amortization expense is $6.2 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 June 30, 2024, by definite-lived other intangible asset class, is presented in the table below:
Weighted Average Remaining Amortization Period
Customer relationships7.2 years
Technology3.2 years
Trademarks and trade names9.6 years
Covenants not to compete0.3 years
Total definite-lived other intangible assets6.8 years