Switzerland's Transocean has won shareholder approval for its $1.2bn takeover of Songa Offshore.

"We are extremely pleased that shareholders have overwhelmingly approved our acquisition of Songa Offshore," said Jeremy Thigpen, president and CEO.

"With this acquisition, we add to our industry leading backlog, providing more visibility to future earnings and cash flows. As importantly, we enhance our industry leading harsh environment fleet in the midst of a strengthening global harsh environment market."