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Equity Method Investment In ARO Narrative (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2022
USD ($)
drillship
jackup
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]        
Number of Rigs Owned by ARO | jackup 7      
Total Number Of Contract Drilling Rigs 55      
Number of jackups leased by ARO | jackup 8      
Contracts Terms On Purchased Rigs 15 years      
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      
Maximum Contingent Contributions To Joint Venture $ 1,250.0      
Minimum Renewal Contract Terms For NewBuild Rigs 8 years      
Equity Method Investment Summarized Financial Information Accounts Receivable $ 11.6   $ 12.1  
Equity Method Investment Summarized Financial Information Contract Liabilities 13.9   10.8  
Equity Method Investment Summarized Financial Information Accounts Payable 37.1   38.3  
Due from Joint Ventures, Noncurrent 256.8   $ 249.1 $ 442.7
Equity Method Investment Summarized Financial Information Interest Income 10.5 $ 2.6    
Equity Method Investment Summarized Financial Information Interest Receivable $ 2.9      
Shareholder Notes Payable, Term 10 years      
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 | jackup 7      
Middle East & Africa        
Schedule of Equity Method Investments [Line Items]        
Total Number Of Contract Drilling Rigs 17      
Middle East & Africa | ARO        
Schedule of Equity Method Investments [Line Items]        
Total Number Of Contract Drilling Rigs | jackup 7      
Middle East & Africa | Work-in-progress | ARO        
Schedule of Equity Method Investments [Line Items]        
Total Number Of Contract Drilling Rigs | drillship 2      
ARO        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 50.00%