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Goodwill and Other Intangible Assets (Notes) | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | The changes in the carrying value of goodwill by reportable segment for the six months ended June 30, 2021 are as follows:
(in millions) | Audio |  | Precision Devices |  | Total
Balance at December 31, 2020 | $ | 878.8 |  |  | $ | 31.2 |  |  | $ | 910.0 |
Acquisition | — |  |  | 31.4 |  |  | 31.4 |
Balance at June 30, 2021 | $ | 878.8 |  |  | $ | 62.6 |  |  | $ | 941.4 |
The gross carrying value and accumulated amortization for each major class of intangible assets are as follows:
| June 30, 2021 |  | December 31, 2020
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Amortized intangible assets: |  |  |  |  |  |  |
Trademarks | $ | 2.0 |  |  | $ | 0.4 |  |  | $ | 1.0 |  |  | $ | 0.4 |
Patents | 40.8 |  |  | 38.4 |  |  | 40.8 |  |  | 36.1 |
Customer relationships | 39.7 |  |  | 6.7 |  |  | 12.0 |  |  | 5.2 |
Developed technology | 41.7 |  |  | 9.8 |  |  | 36.5 |  |  | 6.7 |
Other | 2.4 |  |  | 1.0 |  |  | 1.8 |  |  | 0.7 |
Total | 126.6 |  |  | 56.3 |  |  | 92.1 |  |  | 49.1 |
Unamortized intangible assets: |  |  |  |  |  |  |
Trademarks | 32.0 |  |  |  |  | 32.0 |  |  |
IPR&D (1) | 3.7 |  |  |  |  | 3.7 |  |  |
Total | 35.7 |  |  |  |  | 35.7 |  |  |
Total intangible assets, net | $ | 106.0 |  |  |  |  | $ | 78.7 |  |  |
(1) The in-process research and development ("IPR&D") project is expected to be complete in 2021. Upon completion of the underlying project, IPR&D will be reclassified as a definite-lived intangible asset and amortized over its estimated useful life. Amortization expense totaled $3.9 million and $3.2 million for the three months ended June 30, 2021 and 2020, respectively. For the six months ended June 30, 2021 and 2020, amortization expense was $7.2 million and $6.5 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 2021 | $ | 8.6 |
2022 | 11.8 |
2023 | 11.2 |
2024 | 11.2 |
2025 | 10.8 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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