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Commitments And Contingencies (Narrative) (Details)
RM in Millions, R$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2024
USD ($)
Oct. 31, 2023
USD ($)
Jul. 31, 2023
BRL (R$)
Dec. 31, 2019
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
drillship
Dec. 31, 2024
MYR (RM)
Dec. 31, 2024
jackup
Oct. 01, 2024
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Apr. 03, 2023
USD ($)
Jan. 31, 2020
rigs
Property, Plant and Equipment [Line Items]                            
Number of newbuild jackup rigs | rigs                           2
Order Period           10 years                
PercentageOfDownPaymentPaidForARONewbuilds                   25.00%       25.00%
ARO Rigs Under Construction             3   1          
Maximum contingent contributions to joint venture         $ 1,250,000,000 $ 1,250,000,000                
Letters of Credit Outstanding, Amount         27,000,000.0 27,000,000.0                
Deposit Liabilities, Collateral Issued, Financial Instruments         10,800,000 10,800,000           $ 12,600,000    
Cost of ARO newbuild jackups, each         250,000,000 250,000,000                
Loss Contingency, Damages Sought, Value     R$ 601.0   97,000,000                  
Litigation Settlement, Amount Awarded from Other Party       $ 200,000,000                    
Long-Term Purchase Commitment, Amount $ 300,000,000                          
Loss Contingency Accrual | RM               RM 25            
Current commitment to ARO for newbuild rigs, after delivery of NB1 and NB2         1,100,000,000 1,100,000,000                
Long-Term Purchase Commitment, Amount $ 300,000,000                          
Accrued Claims         39,500,000 39,500,000           $ 20,400,000    
Revolving Credit Facility [Member]                            
Property, Plant and Equipment [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity                         $ 375,000,000  
Line of Credit Facility, Fair Value of Amount Outstanding         0 0                
Line of Credit Facility, Maximum Borrowing Capacity                         $ 375,000,000  
Revolving Credit Facility [Member] | ARO                            
Property, Plant and Equipment [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity                     $ 100,000,000      
Line of Credit Facility, Fair Value of Amount Outstanding         $ 10,000,000 $ 10,000,000                
Line of Credit Facility, Maximum Borrowing Capacity                     $ 100,000,000      
Senior Notes [Member] | Newbuild Funding Obligation                            
Property, Plant and Equipment [Line Items]                            
Debt Instrument, Face Amount   $ 359,000,000                        
Senior Notes [Member] | Newbuild Funding Obligation | ARO                            
Property, Plant and Equipment [Line Items]                            
Long Term Pecentage of Periodic Payment Terms Balloon Payment To Be Paid   50.00%                        
Debt Instrument, Term   8 years                        
Senior Notes [Member] | Newbuild Funding Obligation | Minimum                            
Property, Plant and Equipment [Line Items]                            
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate   1.25%                        
Senior Notes [Member] | Newbuild Funding Obligation | Maximum                            
Property, Plant and Equipment [Line Items]                            
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate   1.40%