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Commitments And Contingencies (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) drillship jackup | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Decline in Backlog from VALARIS DS-8 Termination |  | $ 150,000,000 |  |
VALARIS DS-8, Loss Contingency Coverage |  | 602,500 |  |
Other Operating Income |  | 118,100,000 | $ 0 | $ 0
Loss Contingency, Damages Sought, Value |  | 100,000,000 |  |
Proceeds from Legal Settlements | $ 27,500,000 | $ 0 | 200,000,000.0 | $ 0
Gain (Loss) Related to Litigation Settlement |  |  | $ 20,300,000 |
ARO Rigs Under Construction | drillship |  | 2 |  |
Order Period |  | 10 years |  |
Number of newbuild jackup rigs | jackup |  | 20 |  |
Maximum Capital Contribution to ARO |  | $ 1,250,000,000 |  |
Letters of Credit Outstanding, Amount |  | $ 115,100,000 |  |

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