( (Sen. Scott Brown's support for financial reform bill included in this update.)NEW YORK ( TheStreet) -- Aon Corp. ( AON) was among the decliners of the financial sector Monday after the company announced a $4.9 billion deal to acquire Hewitt Associates ( HEW). Aon said it will buy Hewitt Associates, a human resources consulting and outsourcing company, for $50 a share, or $4.9 billion in cash and stock. Aon said the deal will save $355 million annually beginning in 2013. The insurance broker said it plans to integrate Hewitt with its existing Aon Consulting operations under the newly created Aon Hewitt brand.