0000007431 2026-08-31 2026-08-31 false 0000007431 8-K 2026-08-31 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