Other Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 3,616.7	$ 3,356.5	$ 7,106.5	$ 6,487.6
Royalty
Disaggregation of Revenue [Line Items]
Total revenues	2.7	17.3	6.6	27.9
Other corporate revenues
Disaggregation of Revenue [Line Items]
Total revenues	105.2	79.1	369.3	219.7
Other
Disaggregation of Revenue [Line Items]
Total revenues	160.0	108.6	452.4	273.0
Collaborative arrangement | AbbVie
Disaggregation of Revenue [Line Items]
Total revenues	(0.1)	(2.5)	(0.5)	(7.2)
Collaborative arrangement | Samsung Bioepis
Disaggregation of Revenue [Line Items]
Total revenues	$ 52.2	$ 14.7	$ 77.0	$ 32.6