The logo for Keurig Dr. Pepper appears in July 2018 above a trading post on the floor of the New York Stock Exchange. (Richard Drew | AP)NEW YORK — Less than a decade after their merger, Keurig and Dr Pepper plan to become separate companies again. Keurig Dr Pepper said Monday it is buying the owner of Peet’s Coffee in an $18 billion (15.7 billion euro) . Shares of Keurig Dr Pepper fell 7% in early trading Monday. Dr Pepper surpasses Pepsi to become the 2nd-most-popular carbonated beverage in the U.S. For the first time, Dr Pepper has surpassed Pepsi as the nation’s No.