Other - Net, Expense (Income) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Revenue, Net										$ 808.1	$ 788.4	$ 707.5
Income related to termination of the exenatide collaboration with Amylin										0.0	0.0	(495.4)
Interest Expense										161.2	148.8	160.1
Investment Income, Interest										(87.0)	(121.0)	(119.7)
Gains (Losses) on Extinguishment of Debt										166.7	0.0	0.0
Other (income)expense										(341.5)	(368.3)	(63.9)
Nonoperating Income (Expense), Total		$ (44.7)	$ (86.5)	$ 123.3	$ (92.7)	$ (137.2)	$ (93.5)	$ (53.8)	$ (56.0)	$ (100.6)	$ (340.5)	(518.9)
Exenatide [Member]
Other (income)expense	[1]											$ (495.4)

[1] (1) Presented in other-net, (income) expense.