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Commitments And Contingencies (Narrative) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) drillship jackup | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Number of newbuild jackup rigs | jackup | 20 |  |
Order Period | 10 years |  |
PercentageOfDownPaymentPaidForARONewbuilds | 2500.00% |  |
ARO Rigs Under Construction | drillship | 2 |  |
Maximum contingent contributions to joint venture | $ 1,250.0 |  |
Letters of Credit Outstanding, Amount | 141.4 |  |
Deposit Liabilities, Collateral Issued, Financial Instruments | $ 20.7 | $ 31.1 | $ 5.8
ENSCO DS-13 [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-term Purchase Commitment, Description | 119.1 million |  |
ENSCO DS-14 [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-term Purchase Commitment, Description | 218.3 million |  |

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