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Goodwill and Intangible Assets (Tables)
 3 Months Ended
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 SolutionsElastomeric Material SolutionsOtherTotal
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, 2026December 31, 2025
(Dollars in millions)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated ImpairmentAccumulated AmortizationNet Carrying Amount
Customer relationships$179.8 $106.9 $72.9 $180.9 $— $105.6 $75.3 
Technology78.7 67.2 11.5 79.4 — 67.2 12.2 
Trademarks and trade names19.8 8.4 11.4 20.1 — 8.3 11.8 
Total definite-lived intangible assets278.3 182.5 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, 2026March 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 relationships6.6 years
Technology2.6 years
Trademarks and trade names8.5 years
Total intangible assets6.3 years