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Contingencies (Narrative) (Details)
R$ in Millions, $ in Millions
 1 Months Ended 6 Months Ended
Jul. 31, 2023
USD ($)
Jul. 31, 2023
BRL (R$)
Dec. 31, 2019
USD ($)
Jun. 30, 2023
USD ($)
jackup
drillship
Dec. 31, 2022
USD ($)
Jan. 31, 2020
drillship
Loss Contingencies [Line Items]            
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       100.4    
Deposit Liabilities, Collateral Issued, Financial Instruments       $ 16.2 $ 20.7  
Litigation Settlement, Amount Awarded from Other Party     $ 200.0      
Subsequent Event            
Loss Contingencies [Line Items]            
Loss Contingency, Damages Sought, Value $ 127.0 R$ 601.0