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Contingencies (Narrative) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2022
USD ($)
jackup
drillship
Dec. 31, 2021
USD ($)
Commitments and Contingencies Disclosure [Abstract]    
Number of Newbuild Jackup Rigs | jackup 20  
Order Period 10 years  
ARO Rigs Under Construction | drillship 2  
Cost of ARO newbuild jackups, each $ 176.0  
Percentage of Down Payment Paid for ARO Newbuilds 25.00%  
Maximum Contingent Contributions To Joint Venture $ 1,250.0  
Minimum Renewal Contract Terms For NewBuild Rigs 8 years  
Letters of credit outstanding, amount $ 33.6  
Deposit Liabilities, Collateral Issued, Financial Instruments $ 27.1 $ 31.1