Other Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 3,376.1	$ 3,600.1	$ 10,592.0	$ 10,706.6
Royalty
Disaggregation of Revenue [Line Items]
Total revenues	10.3	3.3	28.8	9.9
Other corporate revenues
Disaggregation of Revenue [Line Items]
Total revenues	110.0	93.1	599.5	462.4
Revenues related to amendment of contract manufacturing agreement	166.8		166.8		$ 500.0
Other
Disaggregation of Revenue [Line Items]
Total revenues	125.7	109.6	642.6	562.0
Collaborative arrangement | Samsung Bioepis
Disaggregation of Revenue [Line Items]
Total revenues	0.0	0.3	0.7	(0.2)
Collaborative arrangement | ZINBRYTA
Disaggregation of Revenue [Line Items]
Total revenues	$ 5.4	$ 12.9	$ 13.6	$ 89.9