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Equity Method Investment in ARO Equity Method Investment In ARO Narrative (Details)
$ in Millions
 3 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Apr. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
jackup
Dec. 31, 2022
drillship
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]                
Number of Rigs Owned by ARO | drillship             7  
Number of jackups leased by ARO           8 8  
ARO Rigs Under Construction | drillship             2  
Contract terms on purchased rigs       15 years        
Number of newbuild jackup rigs | jackup           20    
Order Period       10 years        
Minimum renewal contract terms for newbuild rigs       8 years        
Accounts receivable     $ 12.1 $ 12.0        
Non-cash amortization   $ 0.0 20.8 44.9 $ 0.0      
Cost of ARO newbuild jackups, each       $ 176.0        
Equity Method Investment Summarized Financial Information Non Cash Interest Income $ 14.8              
Shareholder Notes Payable, Term       10 years        
ARO                
Schedule of Equity Method Investments [Line Items]                
Interest income   3.5 27.8 $ 56.2 18.3      
Non-cash amortization   $ 0.0 20.8 44.9 $ 0.0      
Early Repayment of Principal from Joint Venture Non Current $ 40.0              
ARO                
Schedule of Equity Method Investments [Line Items]                
Accounts payable     38.3 43.2        
Ownership percentage               50.00%
Equity Method Investment Summarized Financial Information Contract Liabilities     $ 10.8 $ 16.7        
Notes Receivable | LIBOR                
Schedule of Equity Method Investments [Line Items]                
Basis spread on variable rate       2.00%