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Commitments And Contingencies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) drillship jackup
Commitments and Contingencies Disclosure [Abstract]
ARO Rigs Under Construction \| drillship	2
Order Period	10 years
Number of newbuild jackup rigs \| jackup	20
Letters of Credit Outstanding, Amount	$ 36.5
Cost of ARO newbuild jackups, each	176.0
Maximum contingent contributions to joint venture	$ 1,250.0
Minimum renewal contract terms for newbuild rigs	8 years
Deposit Liabilities, Collateral Issued, Financial Instruments	$ 31.1