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Segments - Major Customers by Reporting Segments (Details) - Revenues - Customer Concentration Risk
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
PTT Exploration and Production Public Company Limited      
Revenue, Major Customer [Line Items]      
Percentage of contract revenues 24.00% 3.00% 0.00%
CNOOC Petroleum Europe Limited      
Revenue, Major Customer [Line Items]      
Percentage of contract revenues 16.00% 1.00% 0.00%
Perfomex      
Revenue, Major Customer [Line Items]      
Percentage of contract revenues 11.00% 9.00% 1.00%
ExxonMobil      
Revenue, Major Customer [Line Items]      
Percentage of contract revenues 1.00% 18.00% 15.00%
National Drilling Company (ADOC)      
Revenue, Major Customer [Line Items]      
Percentage of contract revenues 0.00% 11.00% 13.00%
Centrica North Sea Limited (Spirit Energy)      
Revenue, Major Customer [Line Items]      
Percentage of contract revenues 0.00% 10.00% 10.00%
TAQA Bratani Limited      
Revenue, Major Customer [Line Items]      
Percentage of contract revenues 0.00% 1.00% 11.00%
Pan American Energy      
Revenue, Major Customer [Line Items]      
Percentage of contract revenues 0.00% 0.00% 13.00%
Customers Accounting For More Than 10% Of Dayrate Revenue      
Revenue, Major Customer [Line Items]      
Percentage of contract revenues 52.00% 53.00% 63.00%