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Contingencies (Narrative) (Details) R$ in Millions, $ in Millions	1 Months Ended			3 Months Ended	6 Months Ended
	Oct. 31, 2023 USD ($) Rate	Jul. 31, 2023 BRL (R$)	Dec. 31, 2019 USD ($)	Jun. 30, 2024 USD ($) drillship jackup	Jun. 30, 2024 USD ($) drillship jackup	Dec. 31, 2023 USD ($)	Apr. 03, 2023 USD ($)	Jan. 31, 2020 drillship
Loss Contingencies [Line Items]
Number of Newbuild Jackup Rigs | jackup				20	20
Order Period					10 years
Loss Contingency, Damages Sought, Value		R$ 601.0		$ 108.0
Percentage of Down Payment Paid for ARO Newbuilds								25.00%
ARO Rigs Under Construction | drillship				2	2
Maximum Contingent Contributions To Joint Venture				$ 1,250.0	$ 1,250.0
Letters of credit outstanding, amount				142.9	142.9
Deposit Liabilities, Collateral Issued, Financial Instruments				10.4	10.4	$ 12.6
Litigation Settlement, Amount Awarded from Other Party			$ 200.0
Max. amount by which VAL commitment to ARO will be reduced with each rig delivery				250.0	250.0
Reduced Contingent Contributions To Joint Venture				1,100.0	1,100.0
Number of ARO newbuild rigs ordered | drillship								2
Revolving Credit Facility
Loss Contingencies [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 375.0
Revolving Credit Facility | ARO
Loss Contingencies [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 100.0	$ 100.0
Line of Credit | Newbuild Funding Obligation
Loss Contingencies [Line Items]
Debt Instrument, Face Amount	$ 359.0
Long Term Pecentage of Periodic PaymentTerms Balloon Payment To Be Paid	50.00%
Debt Instrument, Term	8 years
Minimum | Senior Notes | Newbuild Funding Obligation
Loss Contingencies [Line Items]
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate | Rate	1.25%
Maximum | Senior Notes | Newbuild Funding Obligation
Loss Contingencies [Line Items]
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate | Rate	1.40%

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