Product Sales - Schedule of Net Product Sales (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 12,172.9	$ 16,071.7	$ 8,497.1
United States
Disaggregation of Revenue [Line Items]
Revenues	6,893.7	12,117.2	5,567.6
United States | EYLEA
Disaggregation of Revenue [Line Items]
Revenues	6,264.6	5,792.3	4,947.2
United States | Libtayo
Disaggregation of Revenue [Line Items]
Revenues	374.5	306.3	270.7
United States | Praluent
Disaggregation of Revenue [Line Items]
Revenues	130.0	170.0	150.9
United States | REGEN-COV
Disaggregation of Revenue [Line Items]
Revenues	0.0	5,828.0	185.7
United States | Evkeeza
Disaggregation of Revenue [Line Items]
Revenues	48.6	18.4	0.0
United States | Inmazeb
Disaggregation of Revenue [Line Items]
Revenues	3.0	0.0	0.0
United States | ARCALYST
Disaggregation of Revenue [Line Items]
Revenues	0.0	2.2	13.1
Rest Of World | Libtayo
Disaggregation of Revenue [Line Items]
Revenues	$ 73.0	$ 0.0	$ 0.0