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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill for the period ended December 31, 2024, 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 
Acquisition— 5.0 — 5.0 
Foreign currency translation adjustment(4.1)(3.1)— (7.2)
December 31, 2024$113.6 $241.8 $2.2 $357.6 
Schedule of Intangible Assets
The “Other intangible assets, net” line item in the consolidated statements of financial position, as of December 31, 2024 and 2023, consisted of the following:
20242023
(Dollars in millions)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer relationships$175.9 $96.1 $79.8 $177.9 $90.0 $87.9 
Technology75.6 60.6 15.0 77.4 58.1 19.3 
Trademarks and trade names19.1 7.7 11.4 19.4 7.4 12.0 
Covenants not to compete— — — 1.3 0.9 0.4 
Total definite-lived other intangible assets270.6 164.4 106.2 276.0 156.4 119.6 
Indefinite-lived other intangible asset4.1 — 4.1 4.3 — 4.3 
Total other intangible assets$274.7 $164.4 $110.3 $280.3 $156.4 $123.9 
The amortization expense and impairment charges related to other intangible assets in 2024, 2023 and 2022, were as follows:
(Dollars in millions)202420232022
Amortization expense$12.4 $13.4 $16.4 
Impairment charges$— $— $17.9 
Schedule of Weighted Average Amortization Period, by Intangible Asset Class
The weighted average amortization period as of December 31, 2024, by definite-lived other intangible asset class, were as follows:
Definite-Lived Other Intangible Asset ClassWeighted Average Remaining Amortization Period
Customer relationships7.0 years
Technology3.1 years
Trademarks and trade names9.3 years
Total definite-lived other intangible assets6.7 years