March 8 - Fitch Ratings has affirmed the Issuer Default Rating (IDR) of Ameriprise Financial Inc. (AMP) at 'A', senior unsecured debt rating at 'A-', and the Insurer Financial Strength (IFS) ratings of its primary life insurance subsidiaries at 'AA-'. The Rating Outlook is Stable. (See complete list of ratings at the end of this release.) The rating affirmation reflects AMP's very strong balance sheet fundamentals, good profitability, and favorable market positions characterized by