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Equity Method Investment In ARO Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
jackup
drillship
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
jackup
drillship
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jan. 31, 2020
drillship
Schedule of Equity Method Investments [Line Items]            
Total Number Of Contract Drilling Rigs 53   53      
Number of Newbuild Jackup Rigs | jackup 20   20      
Order Period     10 years      
ARO Rigs Under Construction | drillship 2   2      
Shareholder Notes Payable, Term     10 years      
Debt Instrument, Basis Spread on Variable Rate     2.10%      
Accounts payable - trade $ 347.0   $ 347.0   $ 400.1  
Accretion of Discount on the Notes Receivable     $ 27.6 $ 14.0    
Number of ARO newbuild rigs ordered | drillship           2
Other            
Schedule of Equity Method Investments [Line Items]            
Total Number Of Contract Drilling Rigs 9   9      
ARO            
Schedule of Equity Method Investments [Line Items]            
Total Number Of Contract Drilling Rigs 9   9      
ARO            
Schedule of Equity Method Investments [Line Items]            
Lease Revenue From Related Party $ 12.6 $ 16.8 $ 31.6 35.6    
Accounts payable - trade 13.9   13.9   57.7  
Principal amount 352.0   352.0   $ 402.7  
Accretion of Discount on the Notes Receivable 20.6 $ 7.0 27.6 $ 14.0    
ARO | Net Settlement Agreement            
Schedule of Equity Method Investments [Line Items]            
Accounts payable - trade 50.7   50.7      
Accretion of Discount on the Notes Receivable 13.9   13.9      
Reduction of Accounts Payable $ 50.7   $ 50.7      
ARO            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage 50.00%   50.00%