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Contingencies (Narrative) (Details)
R$ in Millions, $ in Millions
 1 Months Ended 3 Months Ended
Oct. 31, 2023
USD ($)
Rate
Jul. 31, 2023
BRL (R$)
Dec. 31, 2019
USD ($)
Mar. 31, 2024
USD ($)
drillship
jackup
Dec. 31, 2023
USD ($)
Jan. 31, 2020
drillship
Loss Contingencies [Line Items]            
Loss Contingency, Damages Sought, Value   R$ 601.0   $ 120.0    
Number of Newbuild Jackup Rigs | jackup       20    
Order Period       10 years    
Percentage of Down Payment Paid for ARO Newbuilds           25.00%
ARO Rigs Under Construction | drillship       2   2
Maximum Contingent Contributions To Joint Venture       $ 1,250.0    
Letters of credit outstanding, amount       97.2    
Deposit Liabilities, Collateral Issued, Financial Instruments       13.2 $ 12.6  
Litigation Settlement, Amount Awarded from Other Party     $ 200.0      
Max. amount by which VAL commitment to ARO will be reduced with each rig delivery       $ 250.0    
Line of Credit | Newbuild Funding Obligation            
Loss Contingencies [Line Items]            
Debt Instrument, Face Amount $ 359.0          
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%