BP is struggling to control the spiraling costs of the fatal blowout that sent a slick of oil across the Gulf of Mexico for months in 2010, disclosing on Tuesday the disaster’s bill had reached more than $56 billion. The British oil giant marked a watershed last year when it reached a roughly $20 billion agreement that resolved all state and federal claims and was supposed to close a chapter on the spill for the company and victims. But myriad legal entanglements remain, including a separate settlement with Gulf Coast residents harmed by the spill that has grown by $5 billion over the past four years. The mounting bills came into focus on Tuesday, when the company reported a $485 million quarterly net loss that was largely caused by an unexpected $917 million write-down related to the spill. BP said it couldn’t predict how […]