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Contingencies (Narrative) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2021
USD ($)
jackup
drillship
Commitments and Contingencies Disclosure [Abstract]  
Number of Newbuild Jackup Rigs | jackup 20
Order Period 10 years
ARO Rigs Under Construction | drillship 2
Percentage of Down Payment Paid for ARO Newbuilds 25.00%
Maximum Contingent Contributions To Joint Venture $ 1,250.0
Minimum Renewal Contract Terms For NewBuild Rigs 8 years
Letters of credit outstanding, amount $ 151.1
Deposit Liabilities, Collateral Issued, Financial Instruments $ 31.4