Revenues Other Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Other revenues	$ (3,356.5)	$ (3,078.4)	$ (6,487.6)	$ (5,889.1)
Royalty
Disaggregation of Revenue [Line Items]
Other revenues	(17.3)	(11.8)	(27.9)	(37.3)
Other corporate revenues
Disaggregation of Revenue [Line Items]
Other revenues	(79.1)	(20.8)	(219.7)	(79.0)
Other
Disaggregation of Revenue [Line Items]
Other revenues	(108.6)	(41.6)	(273.0)	(131.6)
Collaborative arrangement | AbbVie
Disaggregation of Revenue [Line Items]
Other revenues	(2.5)	(3.9)	(7.2)	(9.8)
Collaborative arrangement | Samsung Bioepis
Disaggregation of Revenue [Line Items]
Other revenues	$ (14.7)	$ (12.9)	$ (32.6)	$ (25.1)