Subsequent Event

6 Months Ended

Jun. 30, 2011

Subsequent Event [Abstract]

Subsequent event

Note 12 — Subsequent event

     On July 20, 2011, we entered into a definitive merger agreement (the “Merger Agreement”) with Medco Health Solutions, Inc. (“Medco”). The Merger Agreement provides that, upon the terms and subject to the conditions set forth in the Merger Agreement, Medco shareholders will receive total consideration of $29.1 billion composed of $71.36 per share in cash and stock (valued based on the closing price of our stock on July 20, 2011), including $28.80 in cash and 0.81 shares for each Medco share owned. Upon closing of the transaction, our shareholders are expected to own approximately 59% of the combined company and Medco shareholders are expected to own approximately 41%. The merger will combine the expertise of two complementary pharmacy benefit managers to accelerate efforts to lower the cost of prescription drugs and improve the quality of care. We anticipate the transaction to close in the first half of 2012. The merger is subject to regulatory clearance and Express Scripts’ and Medco’s shareholder approvals and other customary closing conditions. The transaction will be accounted for under the authoritative guidance for business combinations.