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Collaborative and Other Relationships (Tables) | 6 Months Ended
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Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Summary of Activity Related to BAN2401 and Elenbecestat Collaboration |
|  | For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
(In millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Total development expense incurred by the collaboration related to the advancement of lecanemab and elenbecestat |  | $ | 62.2 |  |  | $ | 33.9 |  |  | $ | 117.7 |  |  | $ | 77.5 |
Biogen's share of lecanemab and elenbecestat development expense reflected in research and development expense in our condensed consolidated statements of income |  | 31.1 |  |  | 17.0 |  |  | 58.8 |  |  | 38.7 |
Total sales and marketing expense incurred by the Lecanemab Collaboration |  | 4.3 |  |  | 1.4 |  |  | 10.0 |  |  | 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 |  | 2.1 |  |  | 0.7 |  |  | 5.0 |  |  | 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 June 30, |  | For the Six Months Ended June 30,
(In millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Total ADUHELM development expense |  | $ | 42.1 |  |  | $ | 35.9 |  |  | $ | 89.1 |  |  | $ | 55.0 |
Biogen's share of ADUHELM development expense reflected in research and development expense in our condensed consolidated statements of income |  | 23.2 |  |  | 19.7 |  |  | 49.0 |  |  | 30.3 |
Total ADUHELM sales and marketing expense incurred by the ADUHELM Collaboration Agreement |  | 125.6 |  |  | 45.2 |  |  | 237.4 |  |  | 67.9 |
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 |  | 67.6 |  |  | 25.2 |  |  | 127.9 |  |  | 37.5 |
Total ADUHELM collaboration third party milestones |  | 100.0 |  |  | 75.0 |  |  | 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 |  |  | 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 June 30, |  | For the Six Months Ended June 30,
(In millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Total Denali collaboration development expense |  | $ | 10.4 |  |  | $ | — |  |  | $ | 18.7 |  |  | $ | — |
Biogen's share of Denali development expense reflected in research and development expense in our condensed consolidated statements of income |  | 6.2 |  |  | — |  |  | 11.2 |  |  | — |

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