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Collaboration, License, and Other Agreements - Amounts Recognized In Statement of Operations with Sanofi (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 3,028.7	$ 3,145.0
Sanofi Collaboration Agreement, Antibody | Collaboration revenue | Regeneron's share of profits
Disaggregation of Revenue [Line Items]
Revenues	1,018.2	804.0
Sanofi Collaboration Agreement, Antibody | Collaboration revenue | Reimbursement for manufacturing of commercial supplies
Disaggregation of Revenue [Line Items]
Revenues	165.0	105.8
Sanofi Collaboration Agreement, Antibody | (R&D expense) | Regeneron's obligation for its share of Sanofi R&D expenses, net of reimbursement of R&D expenses
Disaggregation of Revenue [Line Items]
Revenues	(15.5)	(18.6)
Sanofi Collaboration Agreement, Antibody | Reduction of SG&A expense | Reimbursement of commercialization-related expenses
Disaggregation of Revenue [Line Items]
Revenues	$ 159.2	$ 139.5

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