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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 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 SolutionsElastomeric Material SolutionsOtherTotal
December 31, 2024$113.6 $241.8 $2.2 $357.6 
Impairment(67.3)— — (67.3)
Foreign currency translation adjustment5.4 7.8 — 13.2 
September 30, 2025$51.7 $249.6 $2.2 $303.5 
Schedule of Intangible Assets
The carrying amount of other intangible assets were as follows:
September 30, 2025December 31, 2024
(Dollars in millions)Gross Carrying AmountAccumulated ImpairmentAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer relationships$181.0 $— $103.8 $77.2 $175.9 $96.1 $79.8 
Technology79.4 — 66.4 13.0 75.6 60.6 15.0 
Trademarks and trade names20.1 — 8.2 11.9 19.1 7.7 11.4 
Total definite-lived other intangible assets280.5 — 178.4 102.1 270.6 164.4 106.2 
Indefinite-lived other intangible asset4.5 4.5 — — 4.1 — 4.1 
Total other intangible assets$285.0 $4.5 $178.4 $102.1 $274.7 $164.4 $110.3 
The amortization expense related to other intangible assets was as follows:
Three Months EndedNine Months Ended
(Dollars in millions)September 30, 2025September 30, 2024September 30, 2025September 30, 2024
Amortization expense$2.8 $3.1 $8.2 $9.3 
Schedule of Weighted Average Amortization Period, by Intangible Asset Class
The weighted average amortization period as of September 30, 2025, by definite-lived other intangible asset class, is presented in the table below:
Weighted Average Remaining Amortization Period
Customer relationships6.8 years
Technology2.8 years
Trademarks and trade names8.8 years
Total definite-lived other intangible assets6.5 years