Other Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 3,681.6	$ 3,616.7	$ 7,215.9	$ 7,106.5
Royalty
Disaggregation of Revenue [Line Items]
Total revenues	7.1	2.7	18.5	6.6
Other corporate revenues
Disaggregation of Revenue [Line Items]
Total revenues	395.5	105.2	489.5	369.3
Revenues related to amendment of contract manufacturing agreement	170.6		170.6		$ 500.0
Other
Disaggregation of Revenue [Line Items]
Total revenues	407.6	160.0	516.9	452.4
Collaborative arrangement | Samsung Bioepis
Disaggregation of Revenue [Line Items]
Total revenues	0.5	(0.1)	0.7	(0.5)
Collaborative arrangement | ZINBRYTA
Disaggregation of Revenue [Line Items]
Total revenues	$ 4.5	$ 52.2	$ 8.2	$ 77.0