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Description Of The Business And Summary Of Significant Accounting Policies (Narrative) (Details) shares in Millions, $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 USD ($) shares | Dec. 31, 2021 USD ($) continent country shares | Dec. 31, 2021 floater country continent jackup rigs | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of contract drilling rigs | rigs |  |  | 56 |  |
Number of different countries having drilling contracts spanning | country |  | 14 | 14 |  |
Number of different continents having drilling contracts | continent |  | 6 | 6 |  |
Net foreign currency exchange gains (losses) | $ | $ 13.4 | $ 8.1 |  | $ (11.0) | $ (7.4)
Asset Impairment Charges | $ | $ 756.5 | $ 0.0 |  | $ 3,646.2 | $ 104.0
Antidilutive share options excluded from computation of diluted earnings per share | shares | 0.3 | 0.6 |  | 0.4 | 0.3
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 |  |  | $ 3,600.0 | $ 98.4
Floaters [Member] | Ultra Deepwater Drillships [Member] |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of contract drilling rigs |  |  | 11 |  |
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 |  |  | 40 |  |
ARO |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of contract drilling rigs |  |  | 7 |  |

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