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Description Of The Business And Summary Of Significant Accounting Policies (Narrative) (Details) shares in Millions, $ in Millions |  | 12 Months Ended |
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Aug. 18, 2020 | Dec. 31, 2020 USD ($) rigs floater jackup shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2020 country | Dec. 31, 2020 continent | Dec. 31, 2020 | Dec. 31, 2020 drillship
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of contract drilling rigs | rigs |  | 61 |  |  |  |  |  |
Number of jackups leased by ARO |  | 9 |  |  |  |  |  | 9
Number of different countries having drilling contracts spanning | country |  |  |  |  | 9 |  |  |
Number of different continents having drilling contracts | continent |  |  |  |  |  | 5 |  |
Net foreign currency exchange gains (losses) | $ |  | $ (11.0) | $ (7.4) | $ (17.2) |  |  |  |
Asset Impairment Charges | $ |  | $ 3,646.2 | $ 104.0 | $ 40.3 |  |  |  |
Antidilutive share options excluded from computation of diluted earnings per share | shares |  | 0.4 | 0.3 | 1.5 |  |  |  |
Plan of Reorganization, Support of Revolving Credit Facility, Percentage |  | 100.00% |  |  |  |  |  |
Holders Of Equity Interests [Member] |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Plan Of Reorganization, Warrants For New Equity | 7.00% |  |  |  |  |  |  |
Plan Of Reorganization, Warrants Term | 7 years |  |  |  |  |  |  |
Senior Noteholders [Member] |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage | 39.00% |  |  |  |  |  |  |
Plan Of Reorganization, Recovery Of Claims, Percentage | 100.00% |  |  |  |  |  |  |
3.00% Exchangeable senior notes due 2024 |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 3.00% |
Drilling rigs and equipment [Member] | Minimum |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 4 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 |  | 7 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 |  | 3 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 | $ |  | $ 3,600.0 | $ 98.4 | $ 40.3 |  |  |  |
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 |  | 45 |  |  |  |  |  |
ARO |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of contract drilling rigs |  | 7 |  |  |  |  |  |

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