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Equity Method Investment in ARO Equity Method Investment In ARO Narrative (Details)
$ in Millions
 9 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
drillship
Dec. 31, 2020
jackup
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]          
LONG-TERM NOTES RECEIVABLE FROM ARO $ 452.9 $ 442.7      
Contract terms on purchased rigs   15 years      
Number of Rigs Owned by ARO     7 7  
Number of jackups leased by ARO     9 9  
Number of newbuild jackup rigs | jackup       20  
Order Period   10 years      
Maximum contingent contributions to joint venture   $ 1,250.0      
Minimum renewal contract terms for newbuild rigs   8 years      
Accounts receivable 21.8 $ 21.6      
Accounts payable   0.7      
Due from joint ventures   14.2      
Interest income 16.8 18.3      
Contract with Customer, Liability, Current 30.0 57.6      
ARO Rigs Under Construction | drillship     2    
Cost of ARO newbuild jackups, each   176.0      
Equity Method Investment Summarized Financial Information Interest Receivable $ 0.0 0.0      
ARO          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage         50.00%
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%