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Contingencies (Narrative) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
drillship
jackup
Dec. 31, 2022
USD ($)
Jan. 31, 2020
drillship
Commitments and Contingencies Disclosure [Abstract]      
Number of Newbuild Jackup Rigs | jackup 20    
Order Period 10 years    
ARO Rigs Under Construction | drillship 2   2
Percentage of Down Payment Paid for ARO Newbuilds 25.00%    
Maximum Contingent Contributions To Joint Venture $ 1,250.0    
Letters of credit outstanding, amount 140.9    
Deposit Liabilities, Collateral Issued, Financial Instruments $ 19.4 $ 20.7