Other - Net, Expense (Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Revenue, Net	$ 633.0	$ 681.7	$ 633.8
Income related to prepayment of revenue-sharing obligation	(787.8)	0	0
Interest Expense	177.8	186.0	185.5
Investment Income, Interest	(105.0)	(79.9)	(51.9)
Other (income)expense	41.0	72.9	(128.6)
Nonoperating Income (Expense), Total	(674.0)	179.0	5.0
Exenatide [Member]
Other Revenue, Net	70.1	243.1	262.5
Other (income)expense	$ (787.8)