Dentons on Monday announced it had officially combined with Indianapolis-based Bingham Greenebaum Doll and Pittsburgh-based Cohen & Grigsby, taking its first steps to become what it calls the first truly national U.S. firm.

The combinations, first announced in October as a part of Dentons’ new “Golden Spike” strategy, add at least 315 lawyers in 10 U.S. cities—including Cincinnati, Louisville, and Harrisburg, Pennsylvania—to the sprawling Dentons network, which has more than 10,000 lawyers in 74 countries.