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v3.21.2

Intangible Assets and Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Intangible assets |  |  |  |  |  |
Contingent consideration impairment | $ 15.6 |  | $ 29.0 | $ 49.1 | $ 23.5 |
Total intangible assets, gross | 7,607.2 |  |  | 7,607.2 |  | $ 8,220.8
Accumulated Amortization | (5,320.4) |  |  | (5,320.4) |  | (5,136.5)
Intangible assets, net | 2,286.8 |  |  | 2,286.8 |  | 3,084.3
Amortization and impairment of acquired intangible assets | 111.0 |  | 82.6 | 813.2 | 215.6 |
Expected future amortization expense, 2019 (remaining three months) | 70.0 |  |  | 70.0 |  |
Expected future amortization expense, 2020 | 255.0 |  |  | 255.0 |  |
Expected future amortization expense, 2021 | 210.0 |  |  | 210.0 |  |
Expected future amortization expense, 2022 | 195.0 |  |  | 195.0 |  |
Expected future amortization expense, 2023 | 195.0 |  |  | 195.0 |  |
Expected future amortization expense, 2024 | 180.0 |  |  | 180.0 |  |
Impairment of intangible assets |  |  |  | 629.3 | 19.3 |
Completed technology |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Cost | 7,411.2 |  |  | 7,411.2 |  | 7,394.3
Net | 2,090.8 |  |  | 2,090.8 |  | 2,257.8
Accumulated Amortization | (5,320.4) |  |  | $ (5,320.4) |  | (5,136.5)
Completed technology | Minimum |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Estimated life, (in years) |  |  |  | 4 years |  |
Completed technology | Maximum |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Estimated life, (in years) |  |  |  | 28 years |  |
In-process research and development |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Amortization and impairment of acquired intangible assets | 19.3 |  |  | $ 19.3 |  |
In-process research and development |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Indefinite lived intangible assets useful life |  |  |  | Indefinite until commercialization |  |
Cost and Net | 132.0 |  |  | $ 132.0 |  | 762.5
Accumulated Amortization | 0.0 |  |  | $ 0.0 |  | 0.0
Trademarks and Trade Names |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Indefinite lived intangible assets useful life |  |  |  | Indefinite |  |
Cost and Net | 64.0 |  |  | $ 64.0 |  | 64.0
Accumulated Amortization | 0.0 |  |  | 0.0 |  | $ 0.0
Vixotrigine |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Amortization and impairment of acquired intangible assets |  |  |  | 44.3 |  |
TGN | In-process research and development |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Cost and Net | 132.0 |  |  | 132.0 |  |
BIIB111 |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Impairment of intangible assets | 15.0 |  |  | 365.0 |  |
BIIB111 | Nightstar |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Amortization and impairment of acquired intangible assets | 15.0 |  |  | 365.0 |  |
Impairment of intangible assets |  | $ 115.0 |  |  |  |
BIIB112 |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Impairment of intangible assets |  |  | $ 28.4 | 220.0 | $ 220.0 |
BIIB112 | Nightstar |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Amortization and impairment of acquired intangible assets | 28.4 |  |  | $ 220.0 |  |
BIIB111 and BIIB112 |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Manufacturing and other costs | $ 39.1 |  |  |  |  |

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