Richmond, Va.-based insurance broker Hilb Rogal & Hobbs Co. said its shareholders have approved the $2.1 billion merger of the firm with Willis Group Holdings Ltd.

The firm said the vote came during a special meeting of shareholders today, who approved the “deal overwhelmingly.”

The merger, announced in early June, is expected to be completed Wednesday.

Willis’ position in North America is expected to be substantially improved by the transaction, doubling the firm’s revenues for the continent, the companies said.

The deal will strengthen Willis in key growth areas including California, Florida, Texas, Illinois, New Jersey, New York, Boston and Philadelphia, the company said.