Canada Pension Plan Investment Board agreed to buy Ascot Underwriting Holdings Ltd., the Lloyd’s of London insurer tied to American International Group Inc., as part of a $1.1 billion deal. AIG will get about $240 million in cash proceeds, reflecting the New York-based company’s 20 percent stake in the business and ownership of a related unit in the deal, the company said in a statement Friday. Ascot Underwriting’s ownership has included an employee trust. The $1.1 billion sum also includes a recapitalization of an entity by the buyer, AIG said.