Manufactures and sells coated sheets and tin mill products. The Company operates in three segments: Integrated Steel, Metal Fabrication, and Corporate Investment. Principal products include hot rolled, cold rolled and coated steel sheets, including tin-plated steel. The Company operates two integrated steel mills (Cleveland Works and Indiana Harbor Works), and various finishing and processing facilities. It also operates an iron mining facility in northeastern Minnesota, a limestone quarry in Michigan, and two coke production plants located in Illinois and Ohio.