Collaborative and Other Relationships - ADUHELM Collaboration Agreement (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
Dec. 31, 2023 |
|
| Collaborative arrangements and non-collaborative arrangement transactions | |||
| Excess and obsolescence charges related to inventory | $ 27.5 | $ 17.4 | |
| Eisai | |||
| Collaborative arrangements and non-collaborative arrangement transactions | |||
| Amounts receivable | 15.9 | $ 1.4 | |
| Amounts payable | $ 180.7 | $ 118.4 | |