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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 |

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