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Intangible Assets and Goodwill (Tables) | 3 Months Ended
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Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets | Intangible assets, net of accumulated amortization, impairment charges and adjustments, are summarized as follows:
|  |  | As of March 31, 2020 |  | As of December 31, 2019
(In millions) | Estimated Life |  | Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Completed technology | 4-28 years |  | $ | 7,379.3 |  |  | $ | (4,952.9 | ) |  | $ | 2,426.4 |  |  | $ | 7,379.3 |  |  | $ | (4,881.4 | ) |  | $ | 2,497.9 |
In-process research and development | Indefinite until commercialization |  | 956.5 |  |  | — |  |  | 956.5 |  |  | 965.5 |  |  | — |  |  | 965.5 |
Trademarks and trade names | Indefinite |  | 64.0 |  |  | — |  |  | 64.0 |  |  | 64.0 |  |  | — |  |  | 64.0 |
Total intangible assets |  |  | $ | 8,399.8 |  |  | $ | (4,952.9 | ) |  | $ | 3,446.9 |  |  | $ | 8,408.8 |  |  | $ | (4,881.4 | ) |  | $ | 3,527.4 |
Estimated future amortization for acquired intangible assets | Based upon this most recent analysis, the estimated future amortization of acquired intangible assets for the next five years is expected to be as follows:
(In millions) |  | As of March 31, 2020
2020 (remaining nine months) |  | $ | 193.0 |
2021 |  | 220.0 |
2022 |  | 220.0 |
2023 |  | 230.0 |
2024 |  | 230.0 |
2025 |  | 220.0 |
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 March 31, 2020
Goodwill, beginning of period |  | $ | 5,757.8 |
Other |  | (5.8 | )
Goodwill, end of period |  | $ | 5,752.0 |

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