Armstrong World Industries is a company that designs and manufactures commercial and residential ceiling, wall, and suspension system solutions. It operates in three business segments: 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 company's operations with assets and invesmtents.