CHICAGO--(BUSINESS WIRE)--Fitch Ratings has affirmed the 'A-' Issuer Default Rating (IDR) of the Allstate Corporation (Allstate) as well as the 'A+' Insurer Financial Strength (IFS) ratings of Allstate Insurance Co. and its property/casualty (P/C) affiliates. In addition, Fitch has upgraded the IFS ratings of Allstate Life Insurance Co. and its subsidiaries (ALIC) along with American Heritage Life Insurance Co. (AHLIC) to 'A' from 'A-'. The Rating Outlook is Stable. A full list of ratings follo