Collaborative and Other Relationships - Summary of Activity Related To Denali Therapeutics (Details) - Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost - Denali Therapeutics - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Collaborative arrangements and non-collaborative arrangement transactions | ||||
| Expense incurred by the collaboration | $ 2.3 | $ 11.4 | $ 18.1 | $ 36.3 |
| Expense reflected within statements of income | $ 1.4 | $ 6.9 | $ 10.9 | $ 21.8 |