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Equity Method Investment In ARO Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
jackup
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
jackup
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]          
Number of Rigs Owned by ARO | jackup 7     7  
LONG-TERM NOTES RECEIVABLE FROM ARO $ 442.7     $ 442.7 $ 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     9  
Number of Newbuild Jackup Rigs | jackup 20     20  
Order Period       10 years  
Maximum Contingent Contributions To Joint Venture $ 1,250.0     $ 1,250.0  
Minimum Renewal Contract Terms For NewBuild Rigs       8 years  
Equity Method Investment Summarized Financial Information Accounts Receivable 13.7     $ 13.7 21.8
Due from Joint Ventures         14.2
Equity Method Investment Summarized Financial Information Accounts Payable         $ 0.7
Equity Method Investment Summarized Financial Information Interest Income 4.5 $ 5.8 $ 10.9 13.7  
Equity Method Investment Summarized Financial Information Interest Receivable $ 13.7     $ 13.7  
ARO          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investment, Ownership Percentage 50.00%     50.00%  
ARO          
Schedule of Equity Method Investments [Line Items]          
Lease revenue $ 21.0 19.9 37.0 $ 62.4  
Secondment Revenue, Related Party $ 0.8 $ 17.9 $ 33.5 $ 20.8