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Equity Method Investment In ARO Narrative (Details)
$ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Apr. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
drillship
jackup
Apr. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
drillship
jackup
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]              
Number of Rigs Owned by ARO | jackup     7   7    
Total Number Of Contract Drilling Rigs     52   52    
Contracts Terms On Purchased Rigs         15 years    
Number of Newbuild Jackup Rigs | jackup     20   20    
Order Period         10 years    
ARO Rigs Under Construction | drillship     2   2    
Cost of ARO newbuild jackups, each     $ 176.0   $ 176.0    
Maximum Contingent Contributions To Joint Venture     1,250.0   $ 1,250.0    
Minimum Renewal Contract Terms For NewBuild Rigs         8 years    
Equity Method Investment Summarized Financial Information Accounts Receivable     6.4   $ 6.4 $ 12.1  
Equity Method Investment Summarized Financial Information Contract Liabilities     15.8   15.8 10.8  
Equity Method Investment Summarized Financial Information Accounts Payable     37.1   37.1 38.3  
Due from Joint Ventures, Noncurrent     264.5   264.5 $ 249.1 $ 442.7
Equity Method Investment Summarized Financial Information Interest Income $ 0.9 $ 7.7 10.7 $ 3.5 21.2    
Equity Method Investment Summarized Financial Information Interest Receivable     5.8   $ 5.8    
Shareholder Notes Payable, Term         10 years    
Accretion of discount on shareholders note   $ 6.0 $ 7.7 $ 0.0 $ 15.4    
London Interbank Offered Rate (LIBOR)              
Schedule of Equity Method Investments [Line Items]              
Debt Instrument, Basis Spread on Variable Rate         2.00%    
ARO              
Schedule of Equity Method Investments [Line Items]              
Total Number Of Contract Drilling Rigs     7   7    
Middle East & Africa              
Schedule of Equity Method Investments [Line Items]              
Total Number Of Contract Drilling Rigs     17   17    
Middle East & Africa | ARO              
Schedule of Equity Method Investments [Line Items]              
Total Number Of Contract Drilling Rigs     7   7    
Middle East & Africa | Work-in-progress | ARO              
Schedule of Equity Method Investments [Line Items]              
Total Number Of Contract Drilling Rigs | drillship     2   2    
ARO              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage     50.00%   50.00%