Collaboration, License, and Other Agreements - U.S. Government Narrative (Details) $ in Millions	1 Months Ended	5 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2021 dose	Jan. 31, 2022 USD ($)	Jun. 30, 2021 USD ($) dose	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Revenues				$ 16,071.7	$ 8,497.1	$ 6,557.6
U.S. government | REGEN-COV
Disaggregation of Revenue [Line Items]
Maximum transaction agreement payments				$ 465.9
U.S. government | REGEN-COV | Other Transaction Agreement
Disaggregation of Revenue [Line Items]
Collaborative Arrangement, Number Of Doses Counterparty To Purchase | dose	1,400,000		1,250,000
Revenues			$ 2,625.0
U.S. government | REGEN-COV | Other Transaction Agreement | Subsequent Event
Disaggregation of Revenue [Line Items]
Maximum transaction agreement payments		$ 2,940.0