Collaborative and Other Relationships - Summary of Activity Related to Sage Therapeutics (Details) - Sage Therapeutics - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Research and development
Collaborative arrangements and non-collaborative arrangement transactions
Expense incurred by the collaboration	$ 176.7	$ 173.3	$ 167.7
Expense reflected within statements of income	88.3	86.7	83.8
Selling, general and administrative
Collaborative arrangements and non-collaborative arrangement transactions
Expense incurred by the collaboration	187.0	109.9	36.4
Expense reflected within statements of income	$ 93.5	$ 55.0	$ 18.2