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%

Valaris Ltd 10-K