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Discontinued Operations (Schedule of Rig Sales) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net cash provided by (used in) discontinued operations |  | $ 2.5 | $ (0.8) | $ 8.4
Net Book Value | [1],[2] | 6.9 |  |
Pre-tax Gain/(Loss) | [2] | 2.3 |  |
Disposal Group, Including Discontinued Operation, Gross Profit (Loss) | [2] | 9.2 |  |
Floaters [Member] | ENSCO 7500 [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net cash provided by (used in) discontinued operations | [2] | 2.6 |  |
Net Book Value | [1],[2] | 1.5 |  |
Pre-tax Gain/(Loss) |  | 1.1 |  |
Floaters [Member] | ENSCO DS-2 [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net cash provided by (used in) discontinued operations | [2] | 5.0 |  |
Net Book Value | [1],[2] | 4.0 |  |
Pre-tax Gain/(Loss) |  | 1.0 |  |
Floaters [Member] | ENSCO 6000 [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net cash provided by (used in) discontinued operations | [2] | 0.6 |  |
Net Book Value | [1],[2] | 0.8 |  |
Pre-tax Gain/(Loss) |  | (0.2) |  |
Jackups [Member] | ENSCO 90 [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net cash provided by (used in) discontinued operations | [2] | 0.3 |  |
Net Book Value | [1],[2] | 0.3 |  |
Pre-tax Gain/(Loss) |  | 0.0 |  |
Jackups [Member] | ENSCO 58 [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net cash provided by (used in) discontinued operations | [2] | 0.7 |  |
Net Book Value | [1],[2] | 0.3 |  |
Pre-tax Gain/(Loss) |  | $ 0.4 |  |
[1] | Includes the rig's net book value as well as inventory and other assets on the date of the sale.
[2] | The rigs' operating results were reclassified to discontinued operations in our consolidated statements of operations for each of the years in the three-year period ended December 31, 2018 and were previously included within the specified operating segment.

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