Aon Corp.'s plan, announced last week, to purchase London-based reinsurance broker Benfield Group Ltd. for $1.75 billion (?935 million) has drawn mixed evaluations from the three major rating agencies.

Fitch Ratings, Moody's Investor's Service and Standard & Poor's said they believe the company's move would solidify Chicago-based insurance broker Aon's position as the top reinsurance broker. However, they differed over their evaluation of the impact the purchase will have on the company's liquidity and integration risks.

Aon said last week it would purchase Benfield for $6.55 (?3.50) a share, 29 percent above Benfield's Thursday closing stock price. As part of the deal, Aon will assume $170 million of the company's debt, which one rating service termed modest. The all-cash deal is expected to be completed by the end of this year.

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