State leaders stand ready to commit up to $15.4 million in taxpayer subsidies to a Fortune 500 pharmaceutical company they hope will put an outpost in Minnesota, according to a document made public Wednesday. After declining to provide details the day before, Gov. Mark Dayton’s office released a February letter from the governor and top legislators to a site hunter for Baxter Healthcare Corp. The Deerfield, Ill.-based company is eyeing a property in Brooklyn Park, a Minneapolis suburb, for an expansion that could result in 200 good-paying jobs. The initiative was dubbed “Project Fern” in the official communications, because the Dayton administration signed an agreement that barred it divulging Baxter’s identity or interest in the state.