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Contingencies (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($) jackup drillship	Dec. 31, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Number of Newbuild Jackup Rigs | jackup	20
Order Period	10 years
ARO Rigs Under Construction | drillship	2
Cost of ARO newbuild jackups, each	$ 176.0
Percentage of Down Payment Paid for ARO Newbuilds	25.00%
Maximum Contingent Contributions To Joint Venture	$ 1,250.0
Minimum Renewal Contract Terms For NewBuild Rigs	8 years
Letters of credit outstanding, amount	$ 136.2
Deposit Liabilities, Collateral Issued, Financial Instruments	20.6	$ 31.1
Loss contingency accrual, period increase	$ 25.0

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Cost of ARO newbuild jackups, each

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Maximum Contingent Contributions To Joint Venture

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Minimum Renewal Contract Terms For NewBuild Rigs

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Percentage of Down Payment Paid for ARO Newbuilds

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