Revenues - Other Revenues (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]
Total revenue	$ 2,778.9	$ 3,376.1	$ 8,247.9	$ 10,592.0
Royalty
Disaggregation of Revenue [Line Items]
Total revenue	7.7	10.3	20.3	28.8
Other corporate revenues
Disaggregation of Revenue [Line Items]
Total revenue	143.8	110.0	314.1	599.5
Other
Disaggregation of Revenue [Line Items]
Total revenue	157.8	125.7	350.1	642.6
Collaborative arrangement | Samsung Bioepis
Disaggregation of Revenue [Line Items]
Total revenue	0.0	0.0	0.0	0.7
Collaborative arrangement | ZINBRYTA
Disaggregation of Revenue [Line Items]
Total revenue	$ 6.3	$ 5.4	$ 15.7	$ 13.6