Collaborative and Other Relationships - Summary of Activity Related to Sangamo Therapeutics (Details) - Sangamo Therapeutics, Inc. Agreement - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Collaborative arrangements and non-collaborative arrangement transactions
Term of collaboration agreement	5 years
Research and development
Collaborative arrangements and non-collaborative arrangement transactions
Expense incurred by the collaboration	$ 5.1	$ 8.3
Expense reflected within statements of income	$ 2.3	$ 5.5