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Shareholders' Equity (Share Issuance Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Apr. 11, 2019 | Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2019 | Dec. 31, 2020
Shares Issuance [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 75,000,000.0 |  |  |  |  |
Common Stock, Value, Outstanding | $ 8.5 |  | $ 8.5 |  |  |
Common shares, shares issued |  |  |  | 75,000,000 |  |
Class of Warrant or Right, Outstanding |  |  |  | 5,645,161 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 131.88 |  |
Warranted, Period Exercisable |  |  |  | 7 years |  |
Management Incentive Plan |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 8,960,573 |  | 8,960,573 |  |  |
Rowan Companies [Member] |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 1,400.0 |  |  |  |
Class A Ordinary Shares, U.S. [Member] |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |
Common shares, shares issued |  |  |  |  |  | 206,100,000
Class A Ordinary Shares, U.S. [Member] | Rowan Companies [Member] |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |
Number of ordinary shares |  | 88,300,000 |  |  |  |
Shares Issued, Price Per Share |  | $ 15.88 |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 75,000,000 |  |  |  |  |
Common shares, shares issued | 700,000,000 |  | 700,000,000 |  |  |
Common Stock, No Par Value | $ 0.01 |  | $ 0.01 |  |  |
Preferred Stock |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |
Common shares, shares issued | 150,000,000 |  | 150,000,000 | 0 |  |
Common Stock, No Par Value | $ 0.01 |  | $ 0.01 |  |  |
Common Stock [Member] |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 75,000,000.0 |  | 88,000,000.0 |

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