0000007431 2026-05-11 2026-05-11 0000007431 false 8-K 2026-05-11 ARMSTRONG WORLD INDUSTRIES, INC. PA 1-2116 23-0366390 2500 Columbia Avenue P.O. Box 3001 Lancaster PA 17603 717 397-0611 false false false false Common Stock, $0.01 par value per share AWI NYSE false