AmerisourceBergen Corp. said Tuesday it is acquiring PharMEDium Healthcare Holdings Inc. from private equity firm Clayton, Dubilier & Rice LLC for $2.58 billion in cash. News of the deal comes after PharMedium this summer revealed plans for an initial public offering. Lake Forest, Ill.-headquartered PharMEDium is a provider of outsourced compounded sterile preparations to acute care hospitals. PharMedium filed confidentially for an IPO in July. Then in August, it publicly filed its registration statement with the Securities and Exchange Commission. Clayton, Dubilier & Rice acquired a majority stake in PharMedium in January 2014. In the first half of 2015, PharMedium had net sales of $209.5 million, net income of $9.3 million and adjusted Ebitda of $54.9 million. AmerisourceBergen said the deal is expected to be $0.22 to $0.26 accretive to the company’s adjusted earnings per share in fiscal 2016 on a net basis, and is expected to generate about $30 million in synergies by fiscal 2018. The acquisition is expected to expected to be completed in the first quarter of fiscal 2016, which ends December 31, 2015.