Louisville-based institutional pharmacy company PharMerica Corp. (NYSE: PMC) has completed the acquisition of Cranberry Township, Pa.-based Millennium Pharmacy Systems. Millennium provides pharmacy services to the long-term care industry. It operates seven institutional pharmacies, primarily in the Mid-Atlantic region. Terms of the transaction were not disclosed in a news release. But Pharmerica said it expects the purchase to increase its annual revenue by about $120 million and boost earnings…