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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