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Acquisition - Additional Information (Details) - Omnicare, Inc.
$ / shares in Units, $ in Billions
Aug. 18, 2015
USD ($)
$ / shares
Business Acquisition [Line Items]  
Outstanding common shares and voting interests acquired (percent) 100.00%
Business acquisition, share price (in dollars per share) | $ / shares $ 98.00
Consideration transferred $ 9.6
Consideration transferred, liabilities incurred $ 3.1