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Commitments And Contingencies (Narrative) (Details) R$ in Millions, $ in Millions	1 Months Ended				12 Months Ended
	Oct. 31, 2023 USD ($)	Jul. 31, 2023 USD ($)	Jul. 31, 2023 BRL (R$)	Dec. 31, 2019 USD ($)	Dec. 31, 2020	Dec. 31, 2023 USD ($) jackup	Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Order Period					10 years
PercentageOfDownPaymentPaidForARONewbuilds						2500.00%
ARO Rigs Under Construction | jackup						2
Maximum contingent contributions to joint venture						$ 1,250.0
Letters of Credit Outstanding, Amount						128.8
Deposit Liabilities, Collateral Issued, Financial Instruments						12.6	$ 24.4
Cost of ARO newbuild jackups, each						$ 250.0
Loss Contingency, Damages Sought, Value		$ 124.0	R$ 601.0
Litigation Settlement, Amount Awarded from Other Party				$ 200.0
Senior Notes [Member] | Newbuild Funding Obligation
Property, Plant and Equipment [Line Items]
Debt Instrument, Face Amount	$ 359.0
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 | Secured Overnight Financing Rate (SOFR) | Minimum
Property, Plant and Equipment [Line Items]
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate	1.25%
Senior Notes [Member] | Newbuild Funding Obligation | Secured Overnight Financing Rate (SOFR) | Maximum
Property, Plant and Equipment [Line Items]
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate	1.40%

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