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Equity Method Investment in ARO Equity Method Investment In ARO Narrative (Details)
$ in Millions
 4 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
drillship
Dec. 31, 2021
jackup
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]                  
LONG-TERM NOTES RECEIVABLE FROM ARO $ 228.3 $ 249.1   $ 249.1 $ 442.7        
Contract terms on purchased rigs       15 years          
Number of Rigs Owned by ARO             7 7  
Number of jackups leased by ARO             7 7  
Number of newbuild jackup rigs | jackup               20  
Order Period       10 years          
Maximum contingent contributions to joint venture   1,250.0   $ 1,250.0          
Minimum renewal contract terms for newbuild rigs       8 years          
Accounts receivable   12.1   $ 12.1 21.6        
Accounts payable   49.1   49.1 30.9        
Interest income 3.5 27.8 $ 16.8   18.3        
ARO Rigs Under Construction | drillship             2    
Amortization Of Debt Issuance Costs, Notes Receivable $ 0.0 (20.8)     0.0 $ 0.0      
ARO                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage                 50.00%
Accounts payable   $ 10.8   10.8 $ 38.3        
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits       $ 10.2          
Notes Receivable | LIBOR                  
Schedule of Equity Method Investments [Line Items]                  
Basis spread on variable rate       2.00%