Other Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,694.0	$ 3,534.3
Royalty
Disaggregation of Revenue [Line Items]
Total revenue	6.2	11.4
Other corporate revenues
Disaggregation of Revenue [Line Items]
Total revenue	83.2	94.0
Other
Disaggregation of Revenue [Line Items]
Total revenue	93.3	109.3
Collaborative arrangement | Samsung Bioepis
Disaggregation of Revenue [Line Items]
Total revenue	0.0	0.2
Collaborative arrangement | ZINBRYTA
Disaggregation of Revenue [Line Items]
Total revenue	$ 3.9	$ 3.7