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Description Of The Business And Summary Of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended		4 Months Ended	8 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($)	Mar. 31, 2021 USD ($)	Apr. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2023 USD ($) floater rigs jackup $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs \| rigs					53
Net foreign currency exchange gains (losses) \| $			$ 13.4	$ 8.1	$ (3.5)	$ 12.2
Asset Impairment Charges \| $	$ 34.5	$ 5.6	$ 756.5	$ 0.0	$ 0.0	$ 34.5
Class of Warrant or Right, Outstanding \| shares			5,600,000		5,470,950
Common Stock, Par or Stated Value Per Share \| $ / shares			$ 14.39		$ 0.01	$ 0.01
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares			$ 131.88
Warranted, Period Exercisable					7 years
Antidilutive share options excluded from computation of diluted earnings per share \| shares			300,000	600,000	147,000	192,000
Drilling rigs and equipment [Member] \| Minimum
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life					5 years
Drilling rigs and equipment [Member] \| Maximum
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life					35 years
Building and Building Improvements [Member] \| Minimum
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life					10 years
Building and Building Improvements [Member] \| Maximum
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life					30 years
Equipment [Member] \| Minimum
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life					2 years
Equipment [Member] \| Maximum
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life					6 years
Other Rigs [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Asset Impairment Charges \| $			$ 756.5			$ 34.5
Floaters [Member] \| Ultra Deepwater Drillships [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs					13
Floaters [Member] \| Dynamically Positioned Semisubmersible [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs					4
Floaters [Member] \| Moored Semisubmersible Rigs [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs					1
Jackups [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs \| jackup					35
ARO
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs					8