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Contingencies (Narrative) (Details)
R$ in Millions, $ in Millions
 1 Months Ended 9 Months Ended
Oct. 31, 2023
USD ($)
Rate
Jul. 31, 2023
USD ($)
Jul. 31, 2023
BRL (R$)
Dec. 31, 2019
USD ($)
Sep. 30, 2023
USD ($)
jackup
drillship
Dec. 31, 2022
USD ($)
Jan. 31, 2020
drillship
Loss Contingencies [Line Items]              
Loss Contingency, Damages Sought, Value   $ 120.0 R$ 601.0        
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         95.8    
Deposit Liabilities, Collateral Issued, Financial Instruments         $ 14.0 $ 20.7  
Litigation Settlement, Amount Awarded from Other Party       $ 200.0      
Subsequent Event | 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            
Subsequent Event | Minimum | Secured Overnight Financing Rate (SOFR) | Line of Credit | Newbuild Funding Obligation              
Loss Contingencies [Line Items]              
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate | Rate 1.25%            
Subsequent Event | Maximum | Secured Overnight Financing Rate (SOFR) | Line of Credit | Newbuild Funding Obligation              
Loss Contingencies [Line Items]              
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate | Rate 1.40%