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Collaboration, License, and Other Agreements - Amounts Recognized in Statement of Operations with Roche (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 3,452.8	$ 2,294.0	$ 11,120.0	$ 6,074.2
Casirivimab and imdevimab | Roche Collaboration Agreement | Collaboration revenue
Disaggregation of Revenue [Line Items]
Revenues	127.1	0.0	361.8	0.0
Casirivimab and imdevimab | Roche Collaboration Agreement | Research and development expense
Disaggregation of Revenue [Line Items]
Reduction of Research and development expense	$ 10.5	$ 9.5	$ 138.3	$ 9.5

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