Transocean Ltd. is an international provider of offshore contract drilling services for oil and gas wells. The Company's primary business is to contract its drilling rigs, related equipment and work crews primarily on a day rate basis to drill oil and gas wells. The Company operates through the contract drilling services segment. The Company specializes in technically demanding regions of the global offshore drilling business with a particular focus on deepwater and harsh environment drilling services. Its mobile offshore drilling fleet consists of floaters and high-specification jackups used in support of offshore drilling activities and offshore support services across the world. The Company owns or has partial ownership interests in and operates over 60 mobile offshore drilling , including approximately 30 ultra‑deepwater floaters, over seven harsh environment floaters, over five deepwater floaters, over 10 midwater floaters and approximately 10 high-specification jackups.