Aon Corp. said the brokerage has completed selling off two of its units in transactions worth more than $800 million.

The Chicago-based firm said it had closed on the sale of Aon Warranty Group, including Virginia Surety Company, to Warrior Acquisition Corp., an affiliate of Onex Corporation. Also sold was Construction Program Group to Old Republic Insurance Company.

The sale of Aon Warranty and Construction Program, announced in late October, is expected to result in sales proceeds and dividends in excess of $85 million, said Aon.

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