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Atwood Merger (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 06, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Oct. 05, 2017 | May 26, 2017
Atwood |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Merger related costs |  | $ 3.8 | $ 8.0 |  |
Atwood | Class A ordinary shares, U.S. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Share price (in dollars per share) |  |  |  |  | $ 6.70
Subsequent Event | Atwood |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Atwood share price value (in dollars per share) | $ 9.33 |  |  |  |
Merger consideration | $ 782.0 |  |  |  |
Merger related costs | $ 11.8 |  |  |  |
Subsequent Event | Atwood | Class A ordinary shares, U.S. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Ensco stock for each share of Atwood stock converted | 1.60 |  |  |  |
Share price (in dollars per share) |  |  |  | $ 5.83 |
Merger consideration, shares issued (in shares) | 134,100,000 |  |  |  |
6.50% Senior Notes Due 2020 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Debt instrument interest rate stated percentage |  | 6.50% | 6.50% |  |

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