CHICAGO--(BUSINESS WIRE)--Fitch Ratings has assigned an 'A-' rating to The Manufacturers Life Insurance Company's (MLI) previously issued CAD350 million 2.389% fixed/floating subordinated debentures due 2026 (Manulife Financial Corporation (MFC) guarantor). KEY RATING DRIVERS Proceeds from the issuances will be used for general corporate purposes, including future refinancing requirements. Fitch expects June 30, 2015 pro forma financial leverage following the subordinated debt issue, the redemp