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Intangible Assets and Goodwill | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets and Goodwill | Intangible Assets Intangible assets, net of accumulated amortization, impairment charges and adjustments are summarized as follows:
|  |  |  | As of September 30, 2021 |  | As of December 31, 2020
(In millions) |  | Estimated Life |  | Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Completed technology |  | 4-28 years |  | $ | 7,411.2 |  |  | $ | (5,320.4) |  |  | $ | 2,090.8 |  |  | $ | 7,394.3 |  |  | $ | (5,136.5) |  |  | $ | 2,257.8 |
In-process research and development |  | Indefinite until commercialization |  | 132.0 |  |  | — |  |  | 132.0 |  |  | 762.5 |  |  | — |  |  | 762.5 |
Trademarks and trade names |  | Indefinite |  | 64.0 |  |  | — |  |  | 64.0 |  |  | 64.0 |  |  | — |  |  | 64.0 |
Total intangible assets |  |  |  | $ | 7,607.2 |  |  | $ | (5,320.4) |  |  | $ | 2,286.8 |  |  | $ | 8,220.8 |  |  | $ | (5,136.5) |  |  | $ | 3,084.3 |
For the three and nine months ended September 30, 2021, amortization and impairment of acquired intangible assets totaled $111.0 million and $813.2 million, respectively, compared to $82.6 million and $215.6 million, respectively, in the prior year comparative periods. For the three and nine months ended September 30, 2021, amortization and impairment of acquired intangible assets reflects impairment charges of $15.0 million and $365.0 million, respectively, related to BIIB111 (timrepigene emparvovec) for the potential treatment of choroideremia, and impairment charges of $28.4 million and $220.0 million, respectively, related to BIIB112 (cotoretigene toliparvovec) for the potential treatment of X-linked retinitis pigmentosa. For the nine months ended September 30, 2021, amortization and impairment of acquired intangible assets also reflects the impact of a $44.3 million impairment charge related to vixotrigine (BIIB074) for the potential treatment of trigeminal neuralgia (TGN). For the three and nine months ended September 30, 2020, amortization and impairment of acquired intangible assets reflects the impact of a $19.3 million impairment charge related to one of our IPR&D intangible assets. Completed Technology Completed technology primarily relates to our acquisition of all remaining rights to TYSABRI as well as other amounts related to our other marketed products and programs acquired through business combinations. IPR&D Related to Business Combinations IPR&D represents the fair value assigned to research and development assets that we acquired as part of a business combination and had not yet reached technological feasibility at the date of acquisition. Included in IPR&D balances are adjustments related to foreign currency exchange rate fluctuations. We review amounts capitalized as acquired IPR&D for impairment annually, as of October 31, and whenever events or changes in circumstances indicate to us that the carrying value of the assets might not be recoverable. The carrying value associated with our IPR&D assets as of September 30, 2021, relates to the IPR&D programs we acquired in connection with our acquisition of Convergence Pharmaceuticals Holdings Ltd. (Convergence). Vixotrigine In the periods since we acquired vixotrigine, there have been numerous delays in the initiation of Phase 3 studies for the potential treatment of TGN and for the potential treatment of diabetic painful neuropathy (DPN), another form of neuropathic pain. We have engaged with the FDA regarding the design of the Phase 3 studies of vixotrigine for the potential treatment of TGN and DPN and are now performing an additional clinical trial of vixotrigine. The performance of this additional clinical trial delayed the initiation of the Phase 3 studies of vixotrigine for the potential treatment of TGN, and, as a result, we recognized an impairment charge of $44.3 million related to vixotrigine for the potential treatment of TGN during the first quarter of 2021. As of September 30, 2021, the carrying value associated with the remaining vixotrigine IPR&D asset for DPN was $132.0 million. BIIB111 and BIIB112 During the fourth quarter of 2020 we recognized an impairment charge of $115.0 million related to BIIB111 as a result of third-party manufacturing delays that impacted the timing and increased the costs associated with advancing BIIB111 through Phase 3 development. During the second quarter of 2021 we announced that our Phase 3 STAR study of BIIB111 and o ur Phase 2/3 XIRIUS study of BIIB112 did not meet their primary endpoints. In the third quarter of 2021 we suspended further development on these programs based on the decision by management as part of its strategic review process. For the three and nine months ended September 30, 2021, we recorded impairment charges of $15.0 million and $365.0 million, respectively, related to BIIB111, and impairment charges of $28.4 million and $220.0 million, respectively, related to BIIB112. As a result, the remaining book values associated with these programs were reduced to zero. In addition, for the three months ended September 30, 2021, as a result of our decision to suspend further development of BIIB111 and BIIB112, we recorded charges of approximately $39.1 million related to our manufacturing arrangements and other costs that we expect to incur as a result of suspending these programs. Estimated Future Amortization of Intangible Assets The estimated future amortization of finite-lived intangible assets for the next five years is expected to be as follows:
(In millions) |  | As of September 30, 2021
2021 (remaining three months) |  | $ | 70.0 |
2022 |  | 255.0 |
2023 |  | 210.0 |
2024 |  | 195.0 |
2025 |  | 195.0 |
2026 |  | 180.0 |
Goodwill The following table provides a roll forward of the changes in our goodwill balance:
(In millions) |  | As of September 30, 2021
Goodwill, December 31, 2020 |  | $ | 5,762.1 |
Other |  | (1.6) |
Goodwill, September 30, 2021 |  | $ | 5,760.5 |
As of September 30, 2021, we had no accumulated impairment losses related to goodwill. Other includes adjustments related to foreign currency exchange rate fluctuations.

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