Acquisitions	9 Months Ended
Sep. 30, 2013
Business Combinations [Abstract]
Acquisitions	Acquisitions Avila Acquisition On March 7, 2012 (Acquisition Date) we acquired all of the outstanding common stock of Avila Therapeutics, Inc., which was subsequently renamed Celgene Avilomics Research (Avila). The acquisition resulted in Avila becoming our wholly-owned subsidiary. The results of operations for Avila are included in our consolidated financial statements from the Acquisition Date and the assets and liabilities of Avila have been recorded at their respective fair values on the Acquisition Date and consolidated with our other assets and liabilities. We paid $352.2 million in cash, net of cash acquired and we may make additional payments based on achievement of developmental and regulatory milestones. Our potential contingent milestone payments are classified as liabilities, which were measured at fair value as of the Acquisition Date. The range of potential milestone payments is from no payment if none of the milestones are achieved to an estimated maximum of $595.0 million if all milestones are achieved. The potential milestones consist of the initiation of phase II and phase III studies, investigational new drug (IND) filings and other regulatory events related to certain potential products in various stages of development. Contingent Value Rights In connection with the acquisition of Abraxis BioScience, Inc. (Abraxis) on October 15, 2010, we issued Contingent Value Rights (CVRs). Each holder of a CVR is entitled to receive a pro rata portion, based on the number of CVRs then outstanding, of contingent cash payments. In September 2013, the FDA approved ABRAXANE^® for use in the treatment of pancreatic cancer, permitting us to market ABRAXANE^® with a label that includes an overall survival claim. This approval resulted in the achievement of milestone #2 and the subsequent payment of the $300 million milestone on October 4, 2013 in accordance with the CVR agreement. The fair value of our total liability related to the CVRs was $347.9 million on September 30, 2013 and $277.4 million on December 31, 2012. For more information, see Note 2 of Notes to Consolidated Financial Statements included in our 2012 Annual Report on Form 10-K.

Acquisitions

Avila Acquisition

On March 7, 2012 (Acquisition Date) we acquired all of the outstanding common stock of Avila Therapeutics, Inc., which was subsequently renamed Celgene Avilomics Research (Avila). The acquisition resulted in Avila becoming our wholly-owned subsidiary. The results of operations for Avila are included in our consolidated financial statements from the Acquisition Date and the assets and liabilities of Avila have been recorded at their respective fair values on the Acquisition Date and consolidated with our other assets and liabilities.

We paid $352.2 million in cash, net of cash acquired and we may make additional payments based on achievement of developmental and regulatory milestones. Our potential contingent milestone payments are classified as liabilities, which were measured at fair value as of the Acquisition Date. The range of potential milestone payments is from no payment if none of the milestones are achieved to an estimated maximum of $595.0 million if all milestones are achieved. The potential milestones consist of the initiation of phase II and phase III studies, investigational new drug (IND) filings and other regulatory events related to certain potential products in various stages of development.

Contingent Value Rights

In connection with the acquisition of Abraxis BioScience, Inc. (Abraxis) on October 15, 2010, we issued Contingent Value Rights (CVRs). Each holder of a CVR is entitled to receive a pro rata portion, based on the number of CVRs then outstanding, of contingent cash payments.

In September 2013, the FDA approved ABRAXANE^® for use in the treatment of pancreatic cancer, permitting us to market ABRAXANE^® with a label that includes an overall survival claim. This approval resulted in the achievement of milestone #2 and the subsequent payment of the $300 million milestone on October 4, 2013 in accordance with the CVR agreement. The fair value of our total liability related to the CVRs was $347.9 million on September 30, 2013 and $277.4 million on December 31, 2012. For more information, see Note 2 of Notes to Consolidated Financial Statements included in our 2012 Annual Report on Form 10-K.