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Equity Method Investment In ARO Narrative (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2020
USD ($)
jackup
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]    
Number of Rigs Owned by ARO | jackup 7  
Shareholder Notes Receivable, Terms 10 years  
Due from Joint Ventures, Noncurrent $ 452.9 $ 452.9
Contracts Terms On Purchased Rigs 15 years  
Contracts On Purchased Rigs, Terms For Renewal And Repricing 3 years  
Number of jackups leased by ARO | jackup 9  
Number of Newbuild Jackup Rigs | jackup 20  
Order Period 10 years  
Maximum Contingent Contributions To Joint Venture $ 1,250.0  
Initial Contract Terms On Rigs Owned 3 years  
Contract Terms For NewBuild Rigs 8 years  
Minimum Renewal Contract Terms For NewBuild Rigs 8 years  
Contract On New Build Rigs, Terms for Repricing 3 years  
Due from Joint Ventures $ 14.2  
Equity Method Investment Summarized Financial Information Accounts Receivable 34.0 $ 21.8
Equity Method Investment Summarized Financial Information Accounts Payable 0.7  
Equity Method Investment Summarized Financial Information Interest Income 4.6  
Equity Method Investment Summarized Financial Information Interest Receivable $ 4.6  
ARO    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00%  
LIBOR    
Schedule of Equity Method Investments [Line Items]    
Loans Receivable, Basis Spread on Variable Rate 2.00%  
ARO    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Summarized Financial Information, Net Income (Loss) $ 3.2