Transocean Ltd. and federal prosecutors won approval of the oil driller’s agreement to plead guilty to violating the U.S. Clean Water Act for its role in the April 2010 Gulf of Mexico oil spill. Transocean…agreed last month to pay a $400 million criminal fine and $1 billion in civil penalties to the U.S…U.S. District Judge Jane Triche Milazzo gave final approval of the plea at a hearing today…Transocean was the owner and operator of the Deepwater Horizon oil rig, which sank in the Gulf of Mexico after BP Plc’s Macondo well exploded, setting off the largest offshore oil spill in U.S. history. [also refers to Halliburton]