Other Consolidated Financial Statement Detail (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accrued Expenses and Other
Revenue-related reserves for discounts and allowances	$ 865.6		$ 865.6		$ 761.6
Current portion of contingent consideration obligations and milestones	529.4		529.4		844.6
Royalties and licensing fees	218.2		218.2		206.7
Employee compensation and benefits	209.8		209.8		297.7
Construction Payable	179.3		179.3		159.7
Collaboration expenses accrual	156.1		156.1		183.7
Other	638.1		638.1		636.9
Total accrued expenses and other	2,633.7		2,633.7		2,901.3
Other Income (Expense), Net
Interest income	28.7	$ 16.9	55.4	$ 33.6
Interest expense	(51.7)	(63.6)	(102.2)	(127.0)
Gain (Loss) on investments, net	5.3	(13.4)	(9.1)	(11.0)
Foreign exchange gains (losses), net	(13.0)	(2.3)	(14.0)	1.7
Other, net	(3.8)	(6.2)	(5.6)	(3.9)
Other income (expense), net	(34.5)	$ (68.6)	(75.5)	$ (106.6)
Component of accrued expenses and other
Accrued Expenses and Other
Revenue-related reserves for discounts and allowances	$ 702.8		$ 702.8		$ 572.0