FILE - This Aug. 2, 2005 file photo shows Aon Corporation's worldwide headquarters in downtown Chicago. Insurance brokerage Aon Corp. plans to move its corporate headquarters from Chicago to London to improve its access to emerging markets and increase its financial flexibility. Aon said Friday Jan. 13, 2012.The move will help it take advantage of strategic proximity to Lloyd's and the London market, which it calls one of the key international hubs of insurance and risk brokerage. (AP Photo/Charles Rex Arbogast, file)

FILE - This Aug. 2, 2005 file photo shows Aon Corporation's worldwide headquarters in downtown Chicago. Insurance brokerage Aon Corp. plans to move its corporate headquarters from Chicago to London to improve its access to emerging markets and increase its financial flexibility. Aon said Friday Jan. 13, 2012.The move will help it take advantage of strategic proximity to Lloyd's and the London market, which it calls one of the key international hubs of insurance and risk brokerage. (AP Photo/Charles Rex Arbogast, file)
FILE - This Aug. 2, 2005 file photo shows Aon Corporation's worldwide headquarters in downtown Chicago. Insurance brokerage Aon Corp. plans to move its corporate headquarters from Chicago to London to improve its access to emerging markets and increase its financial flexibility. Aon said Friday Jan. 13, 2012.The move will help it take advantage of strategic proximity to Lloyd's and the London market, which it calls one of the key international hubs of insurance and risk brokerage. (AP Photo/Charles Rex Arbogast, file)
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