Collaborative and Other Relationships - Summary of Activity Related to Sage Therapeutics (Details) - Sage Therapeutics - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | ||||
| Collaborative arrangements and non-collaborative arrangement transactions | ||||
| Expense incurred by the collaboration | $ 1.0 | $ (1.7) | $ 3.4 | $ 2.2 |
| Expense reflected within statements of income | 0.5 | (0.9) | 1.7 | 1.1 |
| Income Statement Location [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense | ||||
| Collaborative arrangements and non-collaborative arrangement transactions | ||||
| Expense incurred by the collaboration | 56.4 | 41.8 | 157.2 | 131.0 |
| Expense reflected within statements of income | $ 28.2 | $ 20.9 | $ 78.6 | $ 65.5 |