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Contingencies (Narrative) (Details) R$ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2025 USD ($) | Oct. 31, 2024 USD ($) | Jul. 31, 2023 USD ($) | Jul. 31, 2023 BRL (R$) | Dec. 31, 2019 USD ($) | Jun. 30, 2025 USD ($) jackup | Jun. 30, 2025 jackup | Jun. 30, 2025 drillship | Jun. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Oct. 01, 2024 | Apr. 03, 2023 USD ($) | Jan. 31, 2020 drillship
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Newbuild Jackup Rigs | jackup |  |  |  |  |  | 20 | 20 |  |  |  |  |  |  |
Order Period |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Percentage of Down Payment Paid for ARO Newbuilds |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |
Maximum Contingent Contributions To Joint Venture |  |  |  |  |  |  |  |  | $ 1,250.0 |  |  |  |  |
Max. amount by which VAL commitment to ARO will be reduced with each rig delivery |  |  |  |  |  |  |  |  | 250.0 |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  |  |  | 30.0 |  |  |  |  |
Deposit Liabilities, Collateral Issued, Financial Instruments |  |  |  |  |  |  |  |  | 11.2 |  | $ 10.8 |  |  |
Reduced Contingent Contributions To Joint Venture |  |  |  |  |  |  |  |  | 1,100.0 |  |  |  |  |
Number of ARO newbuild rigs ordered | drillship |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Long-Term Purchase Commitment, Amount |  | $ 300.0 |  |  |  |  |  |  |  |  |  |  |  |
ARO Rig Currently Under Construction |  |  |  |  |  | 3 | 3 | 1 |  |  |  |  |  |
Litigation Settlement, Amount Awarded from Other Party |  |  |  |  | $ 200.0 |  |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  |  |  |  |  |  |  | 7.9 | $ 25.0 |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) |  |  |  |  |  | $ 17.1 |  |  |  |  |  |  |  |
Loss Contingency, Receivable, Current |  |  |  |  |  |  |  |  | $ 7.4 |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  | $ 110.0 | R$ 601.0 |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded from Other Party |  |  |  |  | $ 200.0 |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party | $ 7.9 |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded from Other Party | 7.4 |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded from Other Party | $ 7.4 |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 375.0 |

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