Collaborative and Other Relationships - Sage Therapeutics, Inc. (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Collaborative arrangements and non-collaborative arrangement transactions
Collaboration profit sharing/(loss reimbursement)	$ 74.2	$ 58.1
Share of net profit from sage therapeutics, Percent	50.00%
Sage Therapeutics
Collaborative arrangements and non-collaborative arrangement transactions
Collaboration profit sharing/(loss reimbursement)	$ 17.0	$ 10.1