The purchase was funded with cash on hand and partial proceeds from the previously announced incremental term loan facility, US$1.0bn (£770m) of which was funded on June 29, 2017.
It has also been announced that Weetabix Group marketing director, Sally Abbott, has been appointed managing director of Weetabix Food Company, succeeding Giles Turrell.
And Francesca Davies, currently head of category, will succeed Abbott as marketing director of Weetabix Food Company UK and Ireland.
Post Holdings, Inc., headquartered in St. Louis, Missouri, is a leader in the North American ready-to-eat cereal category, with brands such as Honey Bunches of Oats, Pebbles, Great Grains and Malt-O-Meal bag cereal as well as granola and hot wheat products.
Post now becomes a leader in the UK ready-to-eat cereal category with Weetabix and Alpen.