CF Industries Holdings Inc was founded in 1946. The Company is a manufacturer and distributor of nitrogen and phosphate fertilizer products in the world. The business of the Company is divided into two operating segments, the Nitrogen and the Phosphate segment. The Company's products in the nitrogen segment are ammonia, granular urea, urea ammonium nitrate solution, or UAN, and ammonium nitrate, or AN. The Company's other nitrogen products include urea liquor, diesel exhaust fluid, or DEF, and aqua ammonia, which are sold to its industrial customers. The Company operates seven nitrogen fertilizer production facilities in North America. The Company's products in the phosphate segment are diammonium phosphate, or DAP, and monoammonium phosphate, or MAP. The Company's core market and distribution facilities are concentrated in the Midwestern United States and other agricultural areas of the U.S. and Canada. The Company also exports nitrogen fertilizer products from its Donaldsonville, Louisiana manufacturing facilities and phosphate fertilizer products from its Florida phosphate operations through its Tampa port facility. As of December 31, 2013, the Company's Hardee rock mine had approximately 11 years of fully permitted recoverable phosphate reserves remaining at current operating rates. The Company operates a phosphate fertilizer warehouse located at a deep-water port facility in Tampa, Florida. The phosphate fertilizer produced at Plant City is shipped by truck or rail to it's Tampa warehouse, where it is loaded onto vessels for shipment to export customers or for transport across the Gulf of Mexico to the Mississippi River. In 2013, Martin Sulphur, the Company's molten sulfur supplier, supplied approximately 63% of the molten sulfur used at Plant City. Plant City phosphate fertilizer complex consumes approximately 400,000 tons of ammonia annually. The ammonia used at Plant City phosphate fertilizer complex is shipped by rail from it's ammonia storage facility located in Tampa, Florida. This facility consists of a 38,000-ton ammonia storage tank, access to a deep-water dock that is capable of discharging ocean-going vessels, and rail and truck loading facilities. In Nitrogen segment, North American-based competitors include Agrium Inc. and Koch Nitrogen Company. In Phosphate segment, North American-based competitors include Agrium, Mosaic, Potash Corporation of Saskatchewan Inc. and J.R. Simplot Company. The Company is subject to numerous environmental, health and safety laws and regulations, including laws and regulations relating to land reclamation; the generation, treatment, storage, disposal and handling of hazardous substances and wastes; and the cleanup of hazardous substance releases.