Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 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 Solutions		Elastomeric Material Solutions		Other		Total
December 31, 2024	$	113.6	$	241.8	$	2.2	$	357.6
Impairment	(67.3)		—		—		(67.3)
Foreign currency translation adjustment	5.4		10.2		—		15.6
June 30, 2025	$	51.7	$	252.0	$	2.2	$	305.9

Schedule of Intangible Assets

The carrying amount of other intangible assets were as follows:

	June 30, 2025								December 31, 2024
(Dollars in millions)	Gross Carrying Amount		Accumulated Impairment		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	$	182.0	$	—	$	102.2	$	79.8	$	175.9	$	96.1	$	79.8
Technology	79.6		—		65.8		13.8		75.6		60.6		15.0
Trademarks and trade names	20.3		—		8.1		12.2		19.1		7.7		11.4
Total definite-lived other intangible assets	281.9		—		176.1		105.8		270.6		164.4		106.2
Indefinite-lived other intangible asset	4.5		4.5		—		—		4.1		—		4.1
Total other intangible assets	$	286.4	$	4.5	$	176.1	$	105.8	$	274.7	$	164.4	$	110.3

The amortization expense related to other intangible assets was as follows:

	Three Months Ended				Six Months Ended
(Dollars in millions)	June 30, 2025		June 30, 2024		June 30, 2025		June 30, 2024
Amortization expense	$	2.7	$	3.1	$	5.4	$	6.2

Schedule of Weighted Average Amortization Period, by Intangible Asset Class

The weighted average amortization period as of June 30, 2025, by definite-lived other intangible asset class, is presented in the table below:

	Weighted Average Remaining Amortization Period
Customer relationships	6.9 years
Technology	2.9 years
Trademarks and trade names	9.0 years
Total definite-lived other intangible assets	6.6 years