Armstrong World Industries, Inc. is engaged in the design and manufacture of interior and exterior architectural applications including ceilings, specialty walls and exterior metal solutions. The Company manufactures and sources products made of materials, including mineral fiber, fiberglass, metal, felt, architectural resin and glass, wood, wood fiber and glass-reinforced gypsum. Its segments include Mineral Fiber, Architectural Specialties and Unallocated Corporate. The Mineral Fiber segment produces suspended mineral fiber and fiberglass ceiling systems. The Architectural Specialties segment designs, produces and sources specialty ceilings, walls, and other interior and exterior architectural applications primarily for use in commercial settings. The Unallocated Corporate segment includes assets, liabilities, income and expenses that have not been allocated to other business segments and consists of cash and cash equivalents.