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Commitments And Contingencies (Narrative) (Details) R$ in Millions | 1 Months Ended | 3 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2025 USD ($) | Oct. 31, 2024 USD ($) | Oct. 31, 2023 USD ($) | Jul. 31, 2023 BRL (R$) | Dec. 31, 2019 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2025 USD ($) jackup | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Oct. 01, 2024 | Jun. 30, 2024 USD ($) | Apr. 03, 2023 USD ($) | Jan. 31, 2020 rigs
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of newbuild jackup rigs | rigs |  |  |  |  |  |  |  |  |  |  |  |  | 2
PercentageOfDownPaymentPaidForARONewbuilds |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
ARO Rigs Under Construction | jackup |  |  |  |  |  |  | 2 |  |  |  |  |  |
Maximum contingent contributions to joint venture |  |  |  |  |  |  | $ 1,250,000,000 |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  | 35,400,000 |  |  |  |  |  |
Deposit Liabilities, Collateral Issued, Financial Instruments |  |  |  |  |  |  | 16,300,000 |  | $ 10,800,000 |  |  |  |
Cost of ARO newbuild jackups, each |  |  |  |  |  |  | 250,000,000.0 |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | R$ |  |  |  | R$ 601.0 |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded from Other Party | $ 7,400,000 |  |  |  | $ 200,000,000.0 |  |  |  |  |  |  |  |
Long-Term Purchase Commitment, Amount |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  |  |  |  |  |  |  | 25,000,000.0 |  |  |  |
Current commitment to ARO for newbuild rigs, after delivery of NB1 and NB2 |  |  |  |  |  |  | 1,100,000,000 |  |  |  |  |  |
Long-Term Purchase Commitment, Amount |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Accrued Claims |  |  |  |  |  |  | 21,300,000 |  | $ 39,500,000 |  |  |  |
Litigation Settlement, Amount Awarded to Other Party | $ 7,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) |  |  |  |  |  | $ 17,100,000 |  |  |  |  |  |  |
Loss Contingency, Receivable, Current |  |  |  |  |  |  |  | $ 7,400,000 |  |  |  |  |
Down Payment made for ARO Newbuilds |  |  |  |  |  |  | 43,800,000 |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  | $ 375,000,000.0 |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  |  |  |  |  | 0 |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  | $ 375,000,000.0 |
Revolving Credit Facility [Member] | ARO |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | 150,000,000.0 |  |  |  | $ 100,000,000.0 |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  |  |  |  |  | 0 |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 150,000,000.0 |  |  |  | $ 100,000,000.0 |  |
Senior Notes [Member] | Newbuild Funding Obligation |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 359,000,000.0 |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Newbuild Funding Obligation | ARO |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Pecentage of Periodic Payment Terms Balloon Payment To Be Paid |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  | 8 years |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Newbuild Funding Obligation | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate |  |  | 1.25% |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Newbuild Funding Obligation | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate |  |  | 1.40% |  |  |  |  |  |  |  |  |  |

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