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Contingencies (Narrative) (Details) R$ in Millions, $ in Millions	1 Months Ended				3 Months Ended	9 Months Ended
	Jul. 31, 2025 USD ($)	Oct. 31, 2024 USD ($)	Jul. 31, 2023 BRL (R$)	Dec. 31, 2019 USD ($)	Jun. 30, 2025 USD ($)	Sep. 30, 2025 jackup	Sep. 30, 2025 drillship	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Oct. 01, 2024	Dec. 31, 2023 drillship	Apr. 03, 2023 USD ($)	Jan. 31, 2020 drillship
Loss Contingencies [Line Items]
Number of Newbuild Jackup Rigs | jackup						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								30.4
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	1
Litigation Settlement, Amount Awarded to Other Party	$ 7.9
Litigation Settlement, Amount Awarded from Other Party	7.4			$ 200.0
Loss Contingency Accrual									$ 25.0
Loss Contingency Accrual, Period Increase (Decrease)					$ 17.1
Loss Contingency, Receivable, Current					$ 7.4
Number Of Newbuild Jackup Rigs Delivered | drillship											2
Loss Contingency, Damages Sought, Value | R$			R$ 601.0
Litigation Settlement, Amount Awarded from Other Party	$ 7.4			$ 200.0
Revolving Credit Facility
Loss Contingencies [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity												$ 375.0

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