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	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborative arrangement costs	$ 85.0	$ 55.0	$ 161.6	$ 95.0
Total collaborative arrangement costs included in costs and expenses
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborative arrangement costs	$ 50.9	$ 27.5	$ 96.9	$ 47.5