CHICAGO--(BUSINESS WIRE)--Fitch Ratings views the proposed merger of MPLX LP (NYSE:MPLX) and Markwest Energy Partners, LP (NYSE:MWE) as a positive long-term strategic combination with no near-term ratings implications for MPLX's sponsor, Marathon Petroleum Corporation (NYSE:MPC). The proposed merger contemplates a unit-for-unit exchange, with MPLX issuing new units to MWE unitholders at a fixed exchange ratio of 1.09x. MPC will contribute $675 million in cash to facilitate the transaction, whic


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