Other - Net, Expense (Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income related to the termination of the exenatide collaboration	$ 0	$ (495.4)
Interest Expense	37.8	40.3
Investment Income, Interest	(34.4)	(23.6)
Other (income)expense	(59.4)	(50.5)
Nonoperating Income (Expense), Total	(56.0)	(529.2)
Amylin [Member]
Income related to the termination of the exenatide collaboration	$ 0	$ (495.4)