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Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Summary Of Unaudited Quarterly Consolidated Income Statement | 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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