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Unaudited Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Unaudited Quarterly Financial Data | UNAUDITED QUARTERLY FINANCIAL DATA The following tables summarize our unaudited quarterly condensed consolidated income statement data for the years ended December 31, 2018 and 2017 (in millions, except per share amounts):
|  | 2018
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Year
Operating revenues |  | $ | 417.0 |  |  | $ | 458.5 |  |  | $ | 430.9 |  |  | $ | 399.0 |  |  | $ | 1,705.4 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract drilling (exclusive of depreciation) |  | 325.2 |  |  | 344.3 |  |  | 327.1 |  |  | 322.8 |  |  | 1,319.4 |
Loss on impairment(1) |  | — |  |  | — |  |  | — |  |  | 40.3 |  |  | 40.3 |
Depreciation |  | 115.2 |  |  | 120.7 |  |  | 120.6 |  |  | 122.4 |  |  | 478.9 |
General and administrative |  | 27.9 |  |  | 26.1 |  |  | 25.1 |  |  | 23.6 |  |  | 102.7 |
Operating loss |  | (51.3 | ) |  | (32.6 | ) |  | (41.9 | ) |  | (110.1 | ) |  | (235.9 | )
Other expense, net |  | (70.7 | ) |  | (84.8 | ) |  | (77.7 | ) |  | (69.8 | ) |  | (303.0 | )
Loss from continuing operations before income taxes |  | (122.0 | ) |  | (117.4 | ) |  | (119.6 | ) |  | (179.9 | ) |  | (538.9 | )
Income tax expense |  | 18.4 |  |  | 24.7 |  |  | 23.3 |  |  | 23.2 |  |  | 89.6 |
Loss from continuing operations |  | (140.4 | ) |  | (142.1 | ) |  | (142.9 | ) |  | (203.1 | ) |  | (628.5 | )
Loss from discontinued operations, net |  | (.1 | ) |  | (8.0 | ) |  | — |  |  | — |  |  | (8.1 | )
Net loss |  | (140.5 | ) |  | (150.1 | ) |  | (142.9 | ) |  | (203.1 | ) |  | (636.6 | )
Net (income) loss attributable to noncontrolling interests |  | .4 |  |  | (.9 | ) |  | (2.1 | ) |  | (.5 | ) |  | (3.1 | )
Net loss attributable to Ensco |  | $ | (140.1 | ) |  | $ | (151.0 | ) |  | $ | (145.0 | ) |  | $ | (203.6 | ) |  | $ | (639.7 | )
Loss per share – basic and diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | (.32 | ) |  | $ | (.33 | ) |  | $ | (.33 | ) |  | $ | (.47 | ) |  | $ | (1.45 | )
Discontinued operations |  | — |  |  | (.02 | ) |  | — |  |  | — |  |  | (.02 | )
|  | $ | (.32 | ) |  | $ | (.35 | ) |  | $ | (.33 | ) |  | $ | (.47 | ) |  | $ | (1.47 | )
(1) | Fourth quarter included an aggregate loss of $40.3 million associated with the impairment of an older, non-core jackup rig. See "Note 5 - Property and Equipment" for additional information.
|  | 2017
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Year
Operating revenues |  | $ | 471.1 |  |  | $ | 457.5 |  |  | $ | 460.2 |  |  | $ | 454.2 |  |  | $ | 1,843.0 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract drilling (exclusive of depreciation)(1) |  | 278.1 |  |  | 291.3 |  |  | 285.8 |  |  | 334.3 |  |  | 1,189.5 |
Loss on impairment(2) |  | — |  |  | — |  |  | — |  |  | 182.9 |  |  | 182.9 |
Depreciation |  | 109.2 |  |  | 107.9 |  |  | 108.2 |  |  | 119.5 |  |  | 444.8 |
General and administrative(3) |  | 26.0 |  |  | 30.5 |  |  | 30.4 |  |  | 70.9 |  |  | 157.8 |
Operating income (loss) |  | 57.8 |  |  | 27.8 |  |  | 35.8 |  |  | (253.4 | ) |  | (132.0 | )
Other income (expense), net(4) |  | (57.7 | ) |  | (53.2 | ) |  | (40.4 | ) |  | 87.3 |  |  | (64.0 | )
Income (loss) from continuing operations before income taxes |  | .1 |  |  | (25.4 | ) |  | (4.6 | ) |  | (166.1 | ) |  | (196.0 | )
Income tax expense(5) |  | 24.1 |  |  | 19.3 |  |  | 23.4 |  |  | 42.4 |  |  | 109.2 |
Loss from continuing operations |  | (24.0 | ) |  | (44.7 | ) |  | (28.0 | ) |  | (208.5 | ) |  | (305.2 | )
Income (loss) from discontinued operations, net |  | (.6 | ) |  | .4 |  |  | (.2 | ) |  | 1.4 |  |  | 1.0 |
Net loss |  | (24.6 | ) |  | (44.3 | ) |  | (28.2 | ) |  | (207.1 | ) |  | (304.2 | )
Net (income) loss attributable to noncontrolling interests |  | (1.1 | ) |  | (1.2 | ) |  | 2.8 |  |  | — |  |  | .5 |
Net loss attributable to Ensco |  | $ | (25.7 | ) |  | $ | (45.5 | ) |  | $ | (25.4 | ) |  | $ | (207.1 | ) |  | $ | (303.7 | )
Loss per share – basic and diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | (.09 | ) |  | $ | (.15 | ) |  | $ | (.08 | ) |  | $ | (.49 | ) |  | $ | (.91 | )
Discontinued operations |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
|  | $ | (.09 | ) |  | $ | (.15 | ) |  | $ | (.08 | ) |  | $ | (.49 | ) |  | $ | (.91 | )
(1) | Fourth quarter included $7.0 million of integration costs associated with the Atwood Merger. See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" in Part II for additional information.
(2) | Fourth quarter included an aggregate loss of $182.9 million associated with the impairment of certain rigs. See "Note 5 - Property and Equipment" for additional information.
(3) | Fourth quarter included integration costs of $30.9 million and merger-related costs consisting of various advisory, legal, accounting, valuation and other professional or consulting fees totaling $11.5 million. See "Note 3 - Acquisition of Atwood" for additional information.
(4) | Fourth quarter included a bargain purchase gain of $140.2 million related to the Atwood Merger. See "Note 3 - Acquisition of Atwood" for additional information.
(5) | Fourth quarter included net discrete tax expense of $16.5 million in connection with enactment of U.S. tax reform. See "Note 10 - Income taxes" for additional information.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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