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Collaboration, License, and Other Agreements - Amounts Recognized in Statement of Operations with Bayer (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
Bayer | Rest Of World | Collaboration revenue | Regeneron's share of profits
Disaggregation of Revenue [Line Items]
Revenues	317.3	333.9
Bayer | Rest Of World | Collaboration revenue | Reimbursement for manufacturing of commercial supplies
Disaggregation of Revenue [Line Items]
Revenues	26.6	22.1
Bayer | Rest Of World | (R&D expense) | Regeneron's obligation for its share of Bayer R&D expenses, net of reimbursement of R&D expenses
Disaggregation of Revenue [Line Items]
Revenues	$ (9.4)	$ (8.7)

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