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Goodwill and Other Intangible Assets (Notes)
6 Months Ended
Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
6. Goodwill and Other Intangible Assets

The changes in the carrying value of goodwill by reportable segment for the six months ended June 30, 2025 are as follows:
 (in millions)Precision DevicesMedTech & Specialty AudioTotal
Balance at December 31, 2024$132.1 $137.7 $269.8 
Foreign currency translation0.3 — 0.3 
Balance at June 30, 2025$132.4 $137.7 $270.1 
Other Intangible Assets

The gross carrying value and accumulated amortization for each major class of intangible assets are as follows:
June 30, 2025December 31, 2024
(in millions)Gross Carrying
Amount
Accumulated
Amortization
Gross Carrying
Amount
Accumulated
Amortization
Amortized intangible assets:
Trademarks$15.2 $2.3 $15.2 $1.7 
Customer relationships118.5 33.4 118.5 27.3 
Developed technology26.3 7.4 26.3 6.0 
Other0.8 0.4 0.8 0.4 
Total160.8 43.5 160.8 35.4 
Unamortized intangible assets:
Trademarks32.0 32.0 
Total intangible assets, net$149.3 $157.4 

Amortization expense totaled $4.1 million and $4.2 million for the three months ended June 30, 2025 and 2024, respectively. For the six months ended June 30, 2025 and 2024 amortization expense totaled $8.1 million and $8.6 million, respectively. Amortization expense for the next five years, based on current definite-lived intangible balances, is estimated to be as follows:
(in millions)
Q3-Q4 2025$8.1 
202616.0 
202716.0 
202815.2 
202912.8 
2030 and thereafter49.2 
Total$117.3