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Collaborative and Other Relationships (Tables) | 9 Months Ended
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Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Summary of Activity Related to BAN2401 and Elenbecestat Collaboration |
|  | For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
(In millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Total development expense incurred by the collaboration related to the advancement of lecanemab and elenbecestat |  | $ | 118.4 |  |  | $ | 75.7 |  |  | $ | 236.1 |  |  | $ | 153.2 |
Biogen's share of lecanemab and elenbecestat development expense reflected in research and development expense in our condensed consolidated statements of income |  | 59.2 |  |  | 37.9 |  |  | 118.0 |  |  | 76.6 |
Total sales and marketing expense incurred by the Lecanemab Collaboration |  | 5.6 |  |  | nm |  | 15.6 |  |  | 6.3 |
Biogen's share of lecanemab and elenbecestat sales and marketing expense reflected in selling, general and administrative expense in our condensed consolidated statements of income |  | 2.8 |  |  | nm |  | 7.8 |  |  | 3.2 |
Summary of Activity Related to Aducanumab Collaboration | A summary of development expense, sales and marketing expense and milestone payments related to the ADUHELM Collaboration Agreement is as follows:
|  | For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
(In millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Total ADUHELM development expense |  | $ | 43.7 |  |  | $ | 37.5 |  |  | $ | 132.8 |  |  | $ | 92.5 |
Biogen's share of ADUHELM development expense reflected in research and development expense in our condensed consolidated statements of income |  | 24.0 |  |  | 20.6 |  |  | 73.0 |  |  | 50.9 |
Total ADUHELM sales and marketing expense incurred by the ADUHELM Collaboration Agreement |  | 154.3 |  |  | 90.9 |  |  | 391.7 |  |  | 158.8 |
Biogen's share of ADUHELM sales and marketing expense reflected in selling, general and administrative expense and collaboration profit sharing in our condensed consolidated statements of income |  | 83.3 |  |  | 51.3 |  |  | 211.2 |  |  | 88.8 |
Total ADUHELM collaboration third party milestones |  | — |  |  | — |  |  | 100.0 |  |  | 75.0 |
Biogen's share of reimbursement from Eisai of ADUHELM milestone payments reflected in collaboration profit sharing in our condensed consolidated statements of income |  | — |  |  | — |  |  | 45.0 |  |  | 33.8 |
Summary of Activity Related to Denali Therapeutics Collaboration | A summary of development expense related to this collaboration is as follows:
|  | For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
(In millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Total Denali collaboration development expense |  | $ | 8.5 |  |  | $ | — |  |  | $ | 27.2 |  |  | $ | — |
Biogen's share of Denali development expense reflected in research and development expense in our condensed consolidated statements of income |  | 5.1 |  |  | — |  |  | 16.3 |  |  | — |

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