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Description Of The Business And Summary Of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) shares	Feb. 20, 2025 floater jackup	Apr. 30, 2021 $ / shares
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Net foreign currency exchange gains (losses) \| $	$ 13.8	$ (3.5)	$ 12.2
Asset Impairment Charges \| $	$ 0.0	$ 0.0	$ 34.5
Class of Warrant or Right, Outstanding \| shares	5,470,950
Common Stock, Par or Stated Value Per Share \| $ / shares	$ 0.01	$ 0.01
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares					$ 131.88
Antidilutive share options excluded from computation of diluted earnings per share \| shares	160,000	147,000	192,000
Subsequent Event
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs				52
Drilling rigs and equipment [Member] \| Minimum
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 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
Floaters [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Asset Impairment Charges \| $			$ 34.5
Floaters [Member] \| Ultra Deepwater Drillships [Member] \| Subsequent Event
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs				13
Floaters [Member] \| Dynamically Positioned Semisubmersible [Member] \| Subsequent Event
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs				4
Floaters [Member] \| Moored Semisubmersible Rigs [Member] \| Subsequent Event
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs				1
Jackups [Member] \| Subsequent Event
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs \| jackup				34
ARO \| Subsequent Event
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs				9