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Goodwill and Other Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
The changes in the carrying value of goodwill by reportable segment for the years ended December 31, 2021 and 2020 are as follows:
 (in millions)AudioPrecision DevicesTotal
Balance at January 1, 2020$878.7 $31.2 $909.9 
Foreign currency translation0.1 — 0.1 
Balance at December 31, 2020878.8 31.2 910.0 
Acquisition— 31.3 31.3 
Balance at December 31, 2021$878.8 $62.5 $941.3 
Schedule of Finite-Lived Intangible Assets
The gross carrying value and accumulated amortization for each major class of intangible assets are as follows:
December 31, 2021December 31, 2020
(in millions)Gross Carrying
Amount
Accumulated
Amortization
Gross Carrying
Amount
Accumulated
Amortization
Amortized intangible assets:
Trademarks$2.0 $0.6 $1.0 $0.4 
Patents— — 40.8 36.1 
Customer relationships36.4 5.9 12.0 5.2 
Developed technology (1)
45.4 13.2 36.5 6.7 
Other2.4 1.2 1.8 0.7 
Total86.2 20.9 92.1 49.1 
Unamortized intangible assets:
Trademarks32.0 32.0 
IPR&D (1)
— 3.7 
Total32.0 35.7 
Total intangible assets, net$97.3 $78.7 
(1) The in-process research and development ("IPR&D") project acquired with the ASIC Design Business was completed during the third quarter of 2021. The IPR&D asset has been reclassified as a definite-lived intangible asset to be amortized on a straight-line basis over an estimated useful life of 9 years.
Schedule of Intangible Assets
The gross carrying value and accumulated amortization for each major class of intangible assets are as follows:
December 31, 2021December 31, 2020
(in millions)Gross Carrying
Amount
Accumulated
Amortization
Gross Carrying
Amount
Accumulated
Amortization
Amortized intangible assets:
Trademarks$2.0 $0.6 $1.0 $0.4 
Patents— — 40.8 36.1 
Customer relationships36.4 5.9 12.0 5.2 
Developed technology (1)
45.4 13.2 36.5 6.7 
Other2.4 1.2 1.8 0.7 
Total86.2 20.9 92.1 49.1 
Unamortized intangible assets:
Trademarks32.0 32.0 
IPR&D (1)
— 3.7 
Total32.0 35.7 
Total intangible assets, net$97.3 $78.7 
(1) The in-process research and development ("IPR&D") project acquired with the ASIC Design Business was completed during the third quarter of 2021. The IPR&D asset has been reclassified as a definite-lived intangible asset to be amortized on a straight-line basis over an estimated useful life of 9 years.
Goodwill and Other Intangible Assets
7. Goodwill and Other Intangible Assets

The changes in the carrying value of goodwill by reportable segment for the years ended December 31, 2021 and 2020 are as follows:
 (in millions)AudioPrecision DevicesTotal
Balance at January 1, 2020$878.7 $31.2 $909.9 
Foreign currency translation0.1 — 0.1 
Balance at December 31, 2020878.8 31.2 910.0 
Acquisition— 31.3 31.3 
Balance at December 31, 2021$878.8 $62.5 $941.3 
The gross carrying value and accumulated amortization for each major class of intangible assets are as follows:
December 31, 2021December 31, 2020
(in millions)Gross Carrying
Amount
Accumulated
Amortization
Gross Carrying
Amount
Accumulated
Amortization
Amortized intangible assets:
Trademarks$2.0 $0.6 $1.0 $0.4 
Patents— — 40.8 36.1 
Customer relationships36.4 5.9 12.0 5.2 
Developed technology (1)
45.4 13.2 36.5 6.7 
Other2.4 1.2 1.8 0.7 
Total86.2 20.9 92.1 49.1 
Unamortized intangible assets:
Trademarks32.0 32.0 
IPR&D (1)
— 3.7 
Total32.0 35.7 
Total intangible assets, net$97.3 $78.7 
(1) The in-process research and development ("IPR&D") project acquired with the ASIC Design Business was completed during the third quarter of 2021. The IPR&D asset has been reclassified as a definite-lived intangible asset to be amortized on a straight-line basis over an estimated useful life of 9 years.

As of December 31, 2021, the weighted average remaining useful lives for the amortizable intangible assets are: trademarks at 7.4 years, customer relationships at 7.0 years, developed technology at 5.3 years, and other at 5.1 years. Patents had no remaining useful life as of December 31, 2021. The weighted average remaining useful life in total for all amortizable intangible assets was 6.2 years as of December 31, 2021.

Total amortization expense for the years ended December 31, 2021, 2020, and 2019 was $15.9 million, $13.0 million, and $7.0 million, respectively. Amortization expense for the next five years, based on current definite-lived intangible balances, is estimated to be as follows:
(in millions)
2022$12.2 
202311.6 
202411.6 
202511.2 
20265.3 
Schedule of Future Amortization Expense Amortization expense for the next five years, based on current definite-lived intangible balances, is estimated to be as follows:
(in millions)
2022$12.2 
202311.6 
202411.6 
202511.2 
20265.3