Collaborative and Other Relationships - Summary of Activity Related to the UCB Collaboration (Details) - Research and development - UCB Pharma S.A. - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Collaborative arrangements and non-collaborative arrangement transactions | ||
| Expense incurred by the collaboration | $ 16.6 | $ 18.3 |
| Expense reflected within statements of income | $ 8.3 | $ 9.2 |