CHICAGO--(BUSINESS WIRE)--Fitch Ratings has upgraded NOVA Chemicals Corporation's (NOVA) Issuer Default Rating (IDR) to 'BBB-', its senior unsecured credit facility and senior unsecured notes at 'BBB-', and affirmed the company's secured credit facility at 'BBB-'. The Rating Outlook is revised to Stable from Positive. This rating action affects approximately $1.7 billion of debt and commitments. A full list of ratings is provided at the end of this release. KEY RATING DRIVERS The ratings reflec


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