Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions	9 Months Ended
Sep. 30, 2011	Sep. 30, 2011 PBM [Member]	Sep. 30, 2011 EM [Member]	Dec. 31, 2010 EM [Member]
Summary of change in net carrying value of goodwill by business segment
Beginning Balance	$ 5,486.2	$ 5,405.7	$ 80.5	$ 80.5
Foreign currency translation	(0.8)	(0.8)
Ending Balance	$ 5,485.4	$ 5,404.9	$ 80.5	$ 80.5

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details