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Product Sales - Schedule of Net Product Sales (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 3,452.8	$ 2,294.0	$ 11,120.0	$ 6,074.2
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	2,279.9	1,482.2	8,142.0	3,945.8
UNITED STATES | EYLEA
Disaggregation of Revenue [Line Items]
Revenues	1,473.4	1,318.3	4,245.1	3,604.0
UNITED STATES | Libtayo
Disaggregation of Revenue [Line Items]
Revenues	78.4	71.6	225.5	196.6
UNITED STATES | Praluent
Disaggregation of Revenue [Line Items]
Revenues	44.8	48.5	130.0	95.7
UNITED STATES | REGEN-COV
Disaggregation of Revenue [Line Items]
Revenues	676.7	40.2	3,530.1	40.2
UNITED STATES | Evkeeza
Disaggregation of Revenue [Line Items]
Revenues	6.6	0.0	9.1	0.0
UNITED STATES | ARCALYST
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	$ 3.6	$ 2.2	$ 9.3

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