Acquired In-Process Research and Development and Other Arrangements - Collaborative Arrangement Costs (Details) - Collaborative Arrangement, Transaction with Party to Collaborative Arrangement - CRISPR Therapeutics - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborative arrangement costs	$ 365.8	$ 230.4	$ 101.2
Total collaborative arrangement costs included in costs and expenses
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborative arrangement costs	$ 251.1	$ 129.0	$ 50.6