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Intangible Assets and Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
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 |
Estimated future amortization for acquired 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 |
Summary of roll forward of the changes in 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 |

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