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Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item |  |  | $ 13.3 |  |
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit | $ 0.0 | $ 7.2 |  | $ 0.0 | $ 7.2
Net proceeds from rig sale |  |  | 1.2 |  |
ENSCO 6000 [Member] | Floaters [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  | 7.2 |  |
ENSCO 5002 [Member] [Member] | Floaters [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net proceeds from rig sale |  |  | $ 1.6 |  |

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