Other Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,775.0	$ 3,681.6	$ 5,469.0	$ 7,215.9
Royalty
Disaggregation of Revenue [Line Items]
Total revenue	6.4	7.1	12.6	18.5
Other corporate revenues
Disaggregation of Revenue [Line Items]
Total revenue	87.1	395.5	170.3	489.5
Other
Disaggregation of Revenue [Line Items]
Total revenue	99.0	407.6	192.3	516.9
Collaborative arrangement | Samsung Bioepis
Disaggregation of Revenue [Line Items]
Total revenue	0.0	0.5	0.0	0.7
Collaborative arrangement | ZINBRYTA
Disaggregation of Revenue [Line Items]
Total revenue	$ 5.5	$ 4.5	$ 9.4	$ 8.2