...NEW YORK (Standard & Poor's) Feb. 19, 2015--Standard & Poor's Ratings Services today assigned an 'A-' issue rating to U.S.-based waste services company Waste Management Inc.'s proposed $1.8 billion in senior unsecured notes. The notes will consist of $600 million senior unsecured notes due 2025, $750 million unsecured notes due 2045, and $450 million of senior unsecured notes due 2035. All other ratings on Waste Management are unchanged, including the 'A-' long-term corporate credit rating. The outlook remains stable. For our complete corporate credit rating rationale, see the summary on Waste Management published Dec. 2, 2014, on RatingsDirect. RELATED CRITERIA AND RESEARCH Related Criteria + Methodology And Assumptions: Liquidity Descriptors For Global Corporate Issuers, Dec. 16, 2014 + Key Credit Factors For The Environmental Services Industry, Feb. 12, 2014 + Corporate Methodology, Nov. 19, 2013 + Corporate Methodology: Ratios And Adjustments, Nov. 19, 2013 + Methodology: Management...