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Common Stock Repurchase Program (Notes)	12 Months Ended
Common Stock Repurchase Program (Notes)	Dec. 31, 2011
Common Stock Repurchase Program [Abstract]
Common Stock Repurchase Program [Text Block]	Common Stock Repurchase Program On May 3, 2010, Omnicare announced that the Company’s Board of Directors authorized a new two-year program to repurchase, from time to time, shares of Omnicare’s outstanding common stock having an aggregate value of up to $200 million. On May 26, 2011, the BOD approved an additional $100 million of share repurchase authorization extending until December 31, 2012. In the year ended December 31, 2011, the Company repurchased approximately 4.8 million shares at an aggregate cost of approximately $140 million, for a cumulative amount of approximately 9.2 million shares and approximately $241 million through December 31, 2011. Accordingly, the Company had approximately $59 million of share repurchase authority remaining as of December 31, 2011.