CF Industries Holdings, Inc. is a manufacturer of hydrogen and nitrogen products for clean energy, fertilizer, emissions abatement, and other industrial applications. The Company operates nitrogen manufacturing complexes in the United States, Canada and the United Kingdom. Its segments include Ammonia, Granular Urea, UAN, AN and Other. The Ammonia segment produces anhydrous ammonia (ammonia), which contains 82% nitrogen and 18% hydrogen. The Granular Urea segment produces granular urea, which contains 46% nitrogen. The UAN segment produces urea ammonium nitrate solution (UAN). UAN is a liquid fertilizer product with a nitrogen content that typically ranges from 28% to 32%, and is produced by combining urea and ammonium nitrate. The AN segment produces ammonium nitrate (AN). AN, which has a nitrogen content between 29% and 35%, is produced by combining anhydrous ammonia and nitric acid. The Other segment includes diesel exhaust fluid (DEF), urea liquor, and nitric acid.