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Product Sales - Schedule of Net Product Sales (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
Net product sales
Disaggregation of Revenue [Line Items]
Revenues	1,415.6	1,761.3
Libtayo
Disaggregation of Revenue [Line Items]
Revenues	285.1	263.9
U.S. | ELYEA HD And EYLEA
Disaggregation of Revenue [Line Items]
Revenues	1,042.8	1,401.6
U.S. | ELYEA HD
Disaggregation of Revenue [Line Items]
Revenues	306.8	200.0
U.S. | EYLEA
Disaggregation of Revenue [Line Items]
Revenues	736.0	1,201.6
U.S. | Libtayo
Disaggregation of Revenue [Line Items]
Revenues	192.5	159.2
U.S. | Praluent
Disaggregation of Revenue [Line Items]
Revenues	56.8	70.0
U.S. | Evkeeza
Disaggregation of Revenue [Line Items]
Revenues	30.9	24.8
Rest Of World | Libtayo
Disaggregation of Revenue [Line Items]
Revenues	92.6	104.7
Rest Of World | Inmazeb
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	$ 1.0

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