Denise Petski Senior Managing EditorThe Ellen DeGeneres Show drew solid ratings in its Season 18 premiere Monday, in which DeGeneres addressed allegations of a toxic workplace that had emerged over the summer.The series opener earned a 1.9 rating and 6 share among Households, improving its lead-in 1.2/4 by +58% in rating and 50% in share, and steady vs its year-ago September time period average rating of 1.9/6.Versus last year’s debut episode, Ellen was steady year-to-year with a 1.1 rating