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Shareholders' Equity (Share Issuance Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 06, 2017 | Oct. 05, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Shares Issuance [Line Items] |  |  |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  |  |  | Dec. 31, 2018 |  |  |
Shares Issued, Price Per Share |  |  | $ 9.25 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 65,550,000 | 1,822,432 |  |  |  | 1,822,432 |  |
Proceeds from (Repurchase of) Equity |  |  | $ 585,500,000 |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  | $ 721,800,000 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  | $ 6,200,000 |  | (19,000,000) | $ (2,600,000) | $ 287,800,000 |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 2,000,000,000.0 |  |  | $ 500,000,000.0 | $ 2,000,000,000.0 |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  | 35,000,000.0 |  |  | 65,000,000.0 | 35,000,000.0 |  |
Stock Repurchased During Period, Shares |  |  |  |  |  |  |  | 0 |  |
Atwood Oceanics, Inc. |  |  |  |  |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 770,700,000 | $ 781,800,000 |  |  |  | $ 781,800,000 |  |  |  |
Class A Ordinary Shares, U.S. [Member] | Atwood Oceanics, Inc. |  |  |  |  |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |  |  |  |  |
Number of ordinary shares |  | 132,200,000 |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  | $ 5.83 |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  | $ 194,100,000
Senior Notes [Member] | 5.75% Senior notes due 2044 |  |  |  |  |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  | $ 24,500,000 |  |  |  | $ 24,500,000 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  | $ 8,800,000 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  | 145,600,000 |  |  |
Maximum [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |
Shares Issuance [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  | 291,200,000 |  |  |

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