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, 2021	Dec. 31, 2020	Dec. 31, 2019
Collaborative arrangements and non-collaborative arrangement transactions
Expense incurred by the collaboration	$ 22.7	$ 10.1	$ 0.0
Expense reflected within statements of income	$ 14.6	$ 6.4	$ 0.0

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