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Contingencies (Narrative) (Details)
R$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2024
USD ($)
Oct. 31, 2023
USD ($)
Rate
Jul. 31, 2023
BRL (R$)
Dec. 31, 2019
USD ($)
Sep. 30, 2024
USD ($)
drillship
jackup
Sep. 30, 2024
USD ($)
drillship
jackup
Oct. 01, 2024
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Apr. 03, 2023
USD ($)
Jan. 31, 2020
drillship
Loss Contingencies [Line Items]                      
Number of Newbuild Jackup Rigs | jackup         20 20          
Order Period           10 years          
Loss Contingency, Damages Sought, Value     R$ 601.0   $ 110,000,000            
Percentage of Down Payment Paid for ARO Newbuilds                     25.00%
ARO Rigs Under Construction | drillship         1 1          
Maximum Contingent Contributions To Joint Venture         $ 1,250,000,000 $ 1,250,000,000          
Letters of credit outstanding, amount         29,800,000 29,800,000          
Deposit Liabilities, Collateral Issued, Financial Instruments         11,200,000 11,200,000     $ 12,600,000    
Litigation Settlement, Amount Awarded from Other Party       $ 200,000,000              
Max. amount by which VAL commitment to ARO will be reduced with each rig delivery         250,000,000 250,000,000          
Reduced Contingent Contributions To Joint Venture         1,100,000,000 1,100,000,000          
Number of ARO newbuild rigs ordered | drillship                     2
Subsequent Event                      
Loss Contingencies [Line Items]                      
Percentage of Down Payment Paid for ARO Newbuilds             25.00%        
Long-Term Purchase Commitment, Amount $ 300,000,000                    
Revolving Credit Facility                      
Loss Contingencies [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity                   $ 375,000,000  
Line of Credit Facility, Fair Value of Amount Outstanding         0 0          
Revolving Credit Facility | ARO                      
Loss Contingencies [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity               $ 100,000,000      
Line of Credit Facility, Fair Value of Amount Outstanding         $ 0 $ 0          
Line of Credit | Newbuild Funding Obligation                      
Loss Contingencies [Line Items]                      
Debt Instrument, Face Amount   $ 359,000,000                  
Long Term Pecentage of Periodic PaymentTerms Balloon Payment To Be Paid   50.00%                  
Debt Instrument, Term   8 years                  
Minimum | Senior Notes | Newbuild Funding Obligation                      
Loss Contingencies [Line Items]                      
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate | Rate   1.25%                  
Maximum | Senior Notes | Newbuild Funding Obligation                      
Loss Contingencies [Line Items]                      
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate | Rate   1.40%