Collaborative and Other Relationships - Summary of Activity Related to Sangamo Therapeutics (Details) - Research and development - Sangamo Therapeutics, Inc. Agreement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Collaborative arrangements and non-collaborative arrangement transactions
Expense incurred by the collaboration	$ 4.1	$ 19.1	$ 22.7
Expense reflected within statements of income	$ 2.4	$ 12.1	$ 14.6