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Contingencies (Narrative) (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2024 USD ($)	Mar. 31, 2025 jackup	Dec. 31, 2024 USD ($)	Mar. 31, 2025 drillship	Mar. 31, 2025 USD ($)	Oct. 01, 2024	Apr. 03, 2023 USD ($)	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
Letters of credit outstanding, amount					28.3
Deposit Liabilities, Collateral Issued, Financial Instruments			$ 10.8		10.7
Max. amount by which VAL commitment to ARO will be reduced with each rig delivery					250.0
Reduced Contingent Contributions To Joint Venture					1,100.0
Number of ARO newbuild rigs ordered | drillship								2
Long-Term Purchase Commitment, Amount	$ 300.0
Loss Contingency, Loss in Period			$ 25.0
ARO Rig Currently Under Construction		3		1
Revolving Credit Facility
Loss Contingencies [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 375.0
Line of Credit Facility, Fair Value of Amount Outstanding					$ 0.0

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