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Shareholders' Equity (Share Issuance Narrative) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 11, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Shares Issuance [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 500,000,000.0 |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  | 16,300,000 |
Stock Repurchased During Period, Shares |  | 0 |
Rowan Companies [Member] |  |  |
Shares Issuance [Line Items] |  |  |
Business Combination, Consideration Transferred | $ 1,400,000,000 | $ 1,402,800,000 |
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 |  |
Maximum |  |  |
Shares Issuance [Line Items] |  |  |
Common Stock, Additional Shares Authorized, Aggregate Nominal Amount |  | $ 26,431,699 |
Common Stock, Additional Shares Authorized, Percentage |  | 33.30% |
Maximum | Private Placement [Member] |  |  |
Shares Issuance [Line Items] |  |  |
Common Stock, Additional Shares Authorized, Aggregate Nominal Amount |  | $ 52,863,399 |
Common Stock, Additional Shares Authorized, Percentage |  | 66.60% |
Common Stock [Member] | Rowan Companies [Member] |  |  |
Shares Issuance [Line Items] |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 88,000,000.0

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