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Shareholders' Equity (Share Issuance Narrative) (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 11, 2019 | Oct. 06, 2017 | Oct. 05, 2017 | Jun. 30, 2019 | 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
Atwood Oceanics, Inc. |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 770,700,000 |  |  |
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 |  |  |  |
Class A Ordinary Shares, U.S. [Member] | Atwood Oceanics, Inc. |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |
Shares Issued, Price Per Share |  |  | $ 5.83 |  |
Maximum |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  | 67,600,000
Maximum | Private Placement [Member] |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  | 135,300,000
Common Stock [Member] | Rowan Companies [Member] |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 88,000,000.0 |
Common Stock [Member] | Atwood Oceanics, Inc. |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 33,100,000 |  |

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