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Intangible Assets and Goodwill (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021
Intangible assets |  |  |  |  |  |  |
Contingent consideration impairment | $ (300,000) |  | $ (10,000,000.0) |  | $ 33,500,000 | $ (5,500,000) |
Total intangible assets, gross | 7,637,700,000 | $ 8,220,800,000 |  |  | 7,637,700,000 |  |
Accumulated Amortization | (5,252,700,000) | (5,136,500,000) |  |  | (5,252,700,000) |  |
Intangible assets, net | 2,385,000,000.0 | 3,084,300,000 |  |  | 2,385,000,000.0 |  |
Amortization and impairment of acquired intangible assets | 604,100,000 |  | 61,500,000 |  | 702,200,000 | 133,000,000.0 |
Expected future amortization expense, 2019 (remaining three months) | 110,000,000.0 |  |  |  | 110,000,000.0 |  |
Expected future amortization expense, 2020 | 215,000,000.0 |  |  |  | 215,000,000.0 |  |
Expected future amortization expense, 2021 | 215,000,000.0 |  |  |  | 215,000,000.0 |  |
Expected future amortization expense, 2022 | 225,000,000.0 |  |  |  | 225,000,000.0 |  |
Expected future amortization expense, 2023 | 220,000,000.0 |  |  |  | 220,000,000.0 |  |
Expected future amortization expense, 2024 | 200,000,000.0 |  |  |  | 200,000,000.0 |  |
Impairment of intangible assets |  |  |  |  | 585,900,000 | 0 |
Impairment of Intangible Assets (Excluding Goodwill) |  |  | 0 |  | 0 | $ 0 |
Out-licensed patents |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Cost | 7,394,300,000 | 7,394,300,000 |  |  | 7,394,300,000 |  |
Net | 2,141,600,000 | 2,257,800,000 |  |  | 2,141,600,000 |  |
Accumulated Amortization | (5,252,700,000) | (5,136,500,000) |  |  | $ (5,252,700,000) |  |
Out-licensed patents | Minimum |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Estimated life, (in years) |  |  |  |  | 13 years |  |
Out-licensed patents | Maximum |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Estimated life, (in years) |  |  |  |  | 23 years |  |
Developed technology | Minimum |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Estimated life, (in years) |  |  |  |  | 15 years |  |
Developed technology | Maximum |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Estimated life, (in years) |  |  |  |  | 28 years |  |
Acquired and in-licensed rights and patents | Minimum |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Estimated life, (in years) |  |  |  |  | 4 years |  |
Acquired and in-licensed rights and patents | Maximum |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Estimated life, (in years) |  |  |  |  | 18 years |  |
In Process Research and Development |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Indefinite lived intangible assets useful life |  |  |  |  | Indefinite until commercialization |  |
Cost and Net | 179,400,000 | 762,500,000 |  |  | $ 179,400,000 |  |
Accumulated Amortization | 0 | 0 |  |  | $ 0 |  |
Trademarks and Trade Names |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Indefinite lived intangible assets useful life |  |  |  |  | Indefinite |  |
Cost and Net | 64,000,000.0 | 64,000,000.0 |  |  | $ 64,000,000.0 |  |
Accumulated Amortization | 0 | 0 |  |  | 0 |  |
Vixotrigine |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Amortization and impairment of acquired intangible assets | 44,300,000 |  | $ 0 |  |  |  |
TGN [Member] | In Process Research and Development |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Cost and Net | 136,000,000.0 |  |  |  | 136,000,000.0 |  |
BIIB111 | In Process Research and Development |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Cost and Net | 15,000,000.0 |  |  |  | 15,000,000.0 |  | $ 365,000,000.0
BIIB111 | Nightstar |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Impairment of intangible assets | 350,000,000.0 | $ 115,000,000.0 |  |  | 350,000,000.0 |  |
BIIB112 | In Process Research and Development |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Cost and Net | 28,400,000 |  |  |  | 28,400,000 |  | $ 220,000,000.0
BIIB112 | Nightstar |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Impairment of intangible assets | $ 191,600,000 |  |  |  | $ 191,600,000 |  |
BIIB111 and BIIB112 | Nightstar | Forecast |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  | $ 30,000,000.0 |  |  |

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