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Discontinued Operations (Tables) | 12 Months Ended
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Dec. 31, 2018
Discontinued Operations and Disposal Groups [Abstract] |
Summary Of Rig Sales and Income From Discontinued Operations | The following rig sales were included in discontinued operations during the three-year period ended December 31, 2018 (in millions):
Rig |  | Date of Sale |  | Segment(1) |  | Net Proceeds |  | Net Book Value(2) |  | Pre-tax Gain (Loss)
ENSCO 7500 |  | April 2018 |  | Floaters |  | $ | 2.6 |  |  | $ | 1.5 |  |  | $ | 1.1 |
ENSCO 90 |  | June 2017 |  | Jackups |  | .3 |  |  | .3 |  |  | — |
ENSCO DS-2 |  | May 2016 |  | Floaters |  | 5.0 |  |  | 4.0 |  |  | 1.0 |
ENSCO 58 |  | April 2016 |  | Jackups |  | .7 |  |  | .3 |  |  | .4 |
ENSCO 6000 |  | April 2016 |  | Floaters |  | .6 |  |  | .8 |  |  | (.2 | )
|  |  |  |  |  | $ | 9.2 |  |  | $ | 6.9 |  |  | $ | 2.3 |
(1) 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. (2) Includes the rig's net book value as well as inventory and other assets on the date of the sale. The following table summarizes income (loss) from discontinued operations for each of the years in the three-year period ended December 31, 2018 (in millions):
| 2018 |  | 2017 |  | 2016
Revenues | $ | — |  |  | $ | — |  |  | $ | — |
Operating expenses | 2.0 |  |  | 1.5 |  |  | 3.1 |
Operating loss | (2.0 | ) |  | (1.5 | ) |  | (3.1 | )
Income tax expense (benefit) | 7.1 |  |  | (2.1 | ) |  | (10.1 | )
Gain on disposal of discontinued operations, net | 1.0 |  |  | .4 |  |  | 1.1 |
Income (loss) from discontinued operations | $ | (8.1 | ) |  | $ | 1.0 |  |  | $ | 8.1 |

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- Definition Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109226691&loc=SL51724579-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1474-107760 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5D -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721677-107760 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721659-107760 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721665-107760 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721671-107760 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721663-107760 + Details
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