NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed the Issuer Default Rating (IDR) of DPL, Inc. (DPL) at 'B+' but has downgraded its unsecured debt rating to 'BB-/RR3' from 'BB/RR2'. Fitch has also assigned the rating of 'BB/RR2' to DPL's newly issued secured debt. The downgrade in the unsecured debt rating follows management's decision to upsize its revolving credit facilities and make them secured by granting liens on certain assets. The Rating Outlook remains Stable for DPL. A full list o