MILAN (Reuters) – Generali has been exploring several dossiers in the U.S. for a potential acquisition in the asset management business, a source close to the matter said after a report that the Italian insurer may be considering a deal with U.S.-based Guggenheim Partners. Bloomberg News said Italy’s biggest insurer has held informal talks on options ranging from a full acquisition of Guggenheim’s asset management business to a partnership or strategic investment, citing people familiar with the matter. The source told Reuters Guggenheim may be among the dossiers that Generali had looked at. A…