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Contingencies (Narrative) (Details) $ in Millions	1 Months Ended		24 Months Ended
Contingencies (Narrative) (Details) $ in Millions	Nov. 30, 2025 USD ($)	Oct. 31, 2024 USD ($)	Dec. 31, 2024 jackup	Jun. 30, 2026 USD ($) jackup	May 31, 2026	Dec. 31, 2025 USD ($)	Apr. 03, 2023 USD ($)	Jan. 31, 2020 jackup
Loss Contingencies [Line Items]
Number of Newbuild Jackup Rigs \| jackup				20
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				111.4
Deposit Liabilities, Collateral Issued, Financial Instruments				15.1		$ 16.3
Reduced Contingent Contributions To Joint Venture				$ 1,100.0
Number of ARO newbuild rigs ordered \| jackup								2
Number Of Newbuild Jackup Rigs Delivered \| jackup			2
Kingdom3
Loss Contingencies [Line Items]
Long-Term Purchase Commitment, Amount		$ 300.0
Kingdom4
Loss Contingencies [Line Items]
Long-Term Purchase Commitment, Amount	$ 300.0
Kingdom3 & 4
Loss Contingencies [Line Items]
Percentage of Down Payment Paid for ARO Newbuilds					25.00%
Revolving Credit Facility
Loss Contingencies [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 375.0