Condensed Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
OPERATING REVENUES	$ 909.6	$ 1,059.0	$ 1,723.6	$ 2,222.9
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	350.2	502.6	713.9	1,020.9
Depreciation	112.4	140.5	225.7	277.6
General and administrative	27.4	29.7	50.8	59.8
Total operating expenses	490.0	672.8	990.4	1,358.3
OPERATING (LOSS) INCOME	419.6	386.2	733.2	864.6
OTHER INCOME (EXPENSE)
Interest income	2.5	3.4	4.8	5.8
Interest expense, net	(54.0)	(51.2)	(119.1)	(103.6)
Other, net	261.4	(7.6)	259.6	(30.2)
Other income (expense), net	209.9	(55.4)	145.3	(128.0)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	629.5	330.8	878.5	736.6
PROVISION FOR INCOME TAXES
Current income tax expense	48.6	43.9	86.7	106.6
Deferred income tax (benefit) expense	(11.9)	14.1	21.4	29.1
Total provision for income taxes	36.7	58.0	108.1	135.7
INCOME FROM CONTINUING OPERATIONS	592.8	272.8	770.4	600.9
DISCONTINUED OPERATIONS
Discontinued operations, net	0.2	10.1	1.1	10.3
NET INCOME	592.6	262.7	769.3	590.6
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.0)	(2.4)	(3.4)	(5.6)
NET INCOME ATTRIBUTABLE TO ENSCO	$ 590.6	$ 260.3	$ 765.9	$ 585.0
EARNINGS PER SHARE - BASIC AND DILUTED
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$ 2.04	$ 1.15	$ 2.92	$ 2.53
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share	0.00	(0.04)	0.00	(0.04)
Earnings Per Share, Basic and Diluted	$ 2.04	$ 1.11	$ 2.92	$ 2.49
NET INCOME ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED	$ 580.8	$ 256.7	$ 753.9	$ 577.7
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic (in shares)	284.6	232.1	258.5	232.0
Diluted (in shares)	284.6	232.2	258.5	232.1
CASH DIVIDENDS PER SHARE (in dollars per share)	$ 0.010	$ 0.150	$ 0.020	$ 0.300

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Revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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