June 20 - Fitch Ratings has affirmed Thomson Reuters Corp.'s (TRI) long-term IDR at 'A-'. The Rating Outlook is Stable. Rating Rationale: --Fitch's ratings for TRI reflect the company's cash flow generating ability, its sound balance sheet and its consistent and conservative financial policies. Fitch expects that TRI will continue to target 2.0 times (x) net unadjusted leverage. --Fitch recognizes that there are meaningful barriers to entry in TRI's core businesses. There are also a limited