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Equity Method Investment In ARO Narrative (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
drillship
rigs
jackup
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jan. 31, 2020
drillship
Schedule of Equity Method Investments [Line Items]        
Total Number Of Contract Drilling Rigs 53      
Number of Newbuild Jackup Rigs | jackup 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 $ 394.2   $ 400.1  
LONG-TERM NOTES RECEIVABLE FROM ARO $ 289.3   282.3  
Other        
Schedule of Equity Method Investments [Line Items]        
Total Number Of Contract Drilling Rigs 9      
ARO        
Schedule of Equity Method Investments [Line Items]        
Total Number Of Contract Drilling Rigs 8      
ARO | Asset under Construction        
Schedule of Equity Method Investments [Line Items]        
Number of ARO newbuild rigs ordered | rigs 1      
ARO        
Schedule of Equity Method Investments [Line Items]        
Lease Revenue From Related Party $ 19.0 $ 18.8    
Accounts payable - trade 58.7   57.7  
LONG-TERM NOTES RECEIVABLE FROM ARO $ 289.3   $ 282.3  
ARO        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 50.00%