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Equity Method Investment In ARO Narrative (Details)
$ in Millions
 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
jackup
drillship
Sep. 30, 2021
USD ($)
Apr. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
jackup
drillship
Dec. 31, 2021
USD ($)
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  
Minimum Renewal Contract Terms For NewBuild Rigs         8 years  
Equity Method Investment Summarized Financial Information Accounts Receivable 8.2       $ 8.2 $ 12.1
Equity Method Investment Summarized Financial Information Contract Liabilities 19.1       19.1 10.8
Equity Method Investment Summarized Financial Information Accounts Payable 36.3       36.3 38.3
Principal amount 246.9       $ 246.9 249.1
Shareholder Notes Payable, Term         10 years  
Non-cash amortization     $ 0.0 $ 12.9 $ 37.8  
Equity Method Investment Summarized Financial Information Non Cash Interest Income $ 14.8          
Other            
Schedule of Equity Method Investments [Line Items]            
Total Number Of Contract Drilling Rigs 8       8  
ARO            
Schedule of Equity Method Investments [Line Items]            
Total Number Of Contract Drilling Rigs 7       7  
ARO            
Schedule of Equity Method Investments [Line Items]            
Principal amount $ 402.7       $ 402.7 442.7
Equity Method Investment Summarized Financial Information Interest Income 25.2 $ 9.6 3.5 17.3 46.4  
Equity Method Investment Summarized Financial Information Interest Receivable 8.6       8.6 $ 0.0
Non-cash amortization 22.4 $ 6.9 $ 0.0 $ 12.9 37.8  
Early Repayment of Principal from Joint Venture Non Current $ 40.0       $ 40.0  
London Interbank Offered Rate (LIBOR)            
Schedule of Equity Method Investments [Line Items]            
Debt Instrument, Basis Spread on Variable Rate         2.00%  
Middle East & Africa            
Schedule of Equity Method Investments [Line Items]            
Total Number Of Contract Drilling Rigs 17       17  
Middle East & Africa | Other            
Schedule of Equity Method Investments [Line Items]            
Total Number Of Contract Drilling Rigs 8       8  
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%