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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2024
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, 2023$117.7 $239.9 $2.2 $359.8 
Foreign currency translation adjustment0.6 5.3 — $5.9 
September 30, 2024$118.3 $245.2 $2.2 $365.7 
Schedule of Intangible Assets
The carrying amount of other intangible assets were as follows:
September 30, 2024December 31, 2023
(Dollars in millions)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer relationships$180.5 $96.0 $84.5 $177.9 $90.0 $87.9 
Technology78.1 61.7 16.4 77.4 58.1 19.3 
Trademarks and trade names20.1 7.8 12.3 19.4 7.4 12.0 
Covenants not to compete1.3 1.2 0.1 1.3 0.9 0.4 
Total definite-lived other intangible assets280.0 166.7 113.3 276.0 156.4 119.6 
Indefinite-lived other intangible asset4.4 — 4.4 4.3 — 4.3 
Total other intangible assets$284.4 $166.7 $117.7 $280.3 $156.4 $123.9 
Schedule of Weighted Average Amortization Period, by Intangible Asset Class
The weighted average amortization period as of September 30, 2024, by definite-lived other intangible asset class, is presented in the table below:
Weighted Average Remaining Amortization Period
Customer relationships7.1 years
Technology3.1 years
Trademarks and trade names9.5 years
Covenants not to compete0.1 years
Total definite-lived other intangible assets6.8 years