Armstrong World Industries, Inc. engages in the design, manufacture, and trade of commercial and residential ceiling, wall, and suspension system solutions. It operates through the following segments: Mineral Fiber, Architectural Specialties, and Unallocated Corporate. The Mineral Fiber segment involves the production of suspended and soft fiber ceiling systems. The Architectural Specialties segment focuses on the production, design, and sourcing of ceilings, walls, and facades primarily for use in commercial settings. The Unallocated Corporate segment includes the assets, liabilities, income, and expenses that have not been allocated to other business segments. The company was founded by Thomas M. Armstrong in 1860 and is headquartered in Lancaster, PA.