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Commitment and Contingencies (Details) dose in Millions			3 Months Ended
	Feb. 16, 2024 USD ($)	Dec. 12, 2022 defendant	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) installment	Aug. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Nov. 18, 2022 dose	Sep. 30, 2022 USD ($) payment installment	Oct. 22, 2020 dose
Loss Contingencies [Line Items]
Number of defendants | defendant		2
Period to answer		14 days
Purchase agreement, number of vaccine doses | dose									60
Purchase obligation				$ 0
Gavi Advance Purchase Agreement- COVAX Facility
Loss Contingencies [Line Items]
Number of doses to be distributed | dose							350
Purchase agreement, number of vaccine doses | dose							2
Remaining payment amount						$ 696,400,000
Settlement Agreement
Loss Contingencies [Line Items]
Settlement payment					$ 149,800,000			$ 185,000,000
Number of quarterly installment payments | installment				2				4
Number of settlement payments | payment								2
Settlement agreement, quarterly installment amount				$ 34,300,000
Settlement Agreement | Subsequent Event
Loss Contingencies [Line Items]
Initial settlement payment	$ 75,000,000
Settlement expense	80,000,000
Grants additional credit	$ 225,000,000
Settlement Agreement | Forecast
Loss Contingencies [Line Items]
Settlement expense			$ 400,000,000
Settlement Agreement | Accrued Liabilities
Loss Contingencies [Line Items]
Settlement payment				$ 68,600,000

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