Mediterranean Shipping Co. on Friday became the latest container line to announce planned surcharges on ocean shipments to the United States and Canada if a strike by longshoremen on the U.S. East and Gulf coasts materializes. Contract talks between the International Longshoremen's Association and the bargaining arm for marine terminal operators have stalled, but are now set to resume in 10 days with the help of a federal mediator. The current master contract governing pay, be...