Havas is expected to repitch.
Work that promises to improve the world but doesn't take real action is 'infecting' the industry, Unilever CEO says.
Sale of Droga5 to Accenture will help it stay relevant, founder says.
Changes are part of collaboration with Unstereotype Alliance.
Costs are reported to be for personal expenses over several years.
Veteran marketer will leave in May 2019.
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