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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 ($)
Dec. 31, 2019
USD ($)
rigs
Dec. 31, 2019
USD ($)
Dec. 31, 2019
jackup
Dec. 31, 2019
rigs
Dec. 31, 2018
USD ($)
Oct. 31, 2018
rigs
Schedule of Equity Method Investments [Line Items]              
Shareholder Notes Receivable, Terms   10 years          
Contributions to establish joint venture   $ 25.0          
Number of rigs sold | rigs             2
LONG-TERM NOTES RECEIVABLE FROM ARO     $ 452.9     $ 0.0  
Contract terms on purchased rigs   15 years          
Contract re-pricing and renewal   3 years          
Number of Rigs Owned by ARO       7 7    
Number of jackups leased by ARO 9 9   9      
Number of rigs leased In operation | rigs   9          
Number of newbuild jackup rigs | jackup       20      
Order Period   10 years          
Contract Terms For NewBuild Rigs   8 years          
Maximum contingent contributions to joint venture     1,250.0        
Minimum renewal contract terms for newbuild rigs   8 years          
Accounts receivable     21.8        
Accounts payable     0.7        
Due from joint ventures     $ 14.2        
Interest income $ 16.8            
ARO              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage 50.00% 50.00%          
Notes Receivable | LIBOR              
Schedule of Equity Method Investments [Line Items]              
Basis spread on variable rate   2.00%