Ashland Inc. has completed its acquisition of Hercules Inc. Each share of Hercules common stock outstanding was exchanged for $18.60 in cash and 0.093 of a share of Ashland common stock.      “This is a landmark day for our combined employees, customers, shareholders and all those with whom we interact,” said James J. O’Brien, Ashland chairman and CEO. “Together, we now begin working to build an exciting new future, confident that our people, technologies, products and services will drive our...