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Product Sales - Schedule of Net Product Sales (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 2,936.2	$ 3,452.8	$ 8,758.5	$ 11,120.0
U.S.
Disaggregation of Revenue [Line Items]
Revenues	1,801.4	2,279.9	5,194.4	8,142.0
U.S. | EYLEA
Disaggregation of Revenue [Line Items]
Revenues	1,629.4	1,473.4	4,768.2	4,245.1
U.S. | Libtayo
Disaggregation of Revenue [Line Items]
Revenues	94.7	78.4	264.5	225.5
U.S. | Praluent
Disaggregation of Revenue [Line Items]
Revenues	29.7	44.8	94.5	130.0
U.S. | REGEN-COV
Disaggregation of Revenue [Line Items]
Revenues	0.0	676.7	0.0	3,530.1
U.S. | Evkeeza
Disaggregation of Revenue [Line Items]
Revenues	13.6	6.6	33.2	9.1
U.S. | Inmazeb
Disaggregation of Revenue [Line Items]
Revenues	3.0	0.0	3.0	0.0
U.S. | ARCALYST
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	2.2
ROW | Libtayo
Disaggregation of Revenue [Line Items]
Revenues	$ 31.0	$ 0.0	$ 31.0	$ 0.0

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