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Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
OPERATING REVENUES	$ 458.5	$ 457.5	$ 875.5	$ 928.6
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	344.3	291.3	669.5	569.4
Depreciation	120.7	107.9	235.9	217.1
General and administrative	26.1	30.5	54.0	56.5
Total operating expenses	491.1	429.7	959.4	843.0
OPERATING INCOME (LOSS)	(32.6)	27.8	(83.9)	85.6
OTHER INCOME (EXPENSE)
Interest income	3.9	7.6	6.9	14.8
Interest expense, net	(75.7)	(60.3)	(141.3)	(118.9)
Other, net	(13.0)	(0.5)	(21.1)	(6.8)
Other income (expense), net	(84.8)	(53.2)	(155.5)	(110.9)
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(117.4)	(25.4)	(239.4)	(25.3)
PROVISION FOR INCOME TAXES
Current income tax expense	20.1	13.1	27.2	17.4
Deferred income tax expense	4.6	6.2	15.9	26.0
Total provision for income taxes	24.7	19.3	43.1	43.4
LOSS FROM CONTINUING OPERATIONS	(142.1)	(44.7)	(282.5)	(68.7)
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET	(8.0)	0.4	(8.1)	(0.2)
NET LOSS	(150.1)	(44.3)	(290.6)	(68.9)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(0.9)	(1.2)	(0.5)	(2.3)
NET LOSS ATTRIBUTABLE TO ENSCO	$ (151.0)	$ (45.5)	$ (291.1)	$ (71.2)
LOSS PER SHARE - BASIC AND DILUTED
Continuing operations (in dollars per share)	$ (0.33)	$ (0.15)	$ (0.65)	$ (0.24)
Discontinued operations (in dollars per share)	(0.02)	0.00	(0.02)	0.00
(Loss) earnings per share - basic and diluted (in dollars per share)	$ (0.35)	$ (0.15)	$ (0.67)	$ (0.24)
NET LOSS ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED	$ (151.1)	$ (45.6)	$ (291.3)	$ (71.4)
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic and Diluted (in shares)	434.1	300.9	433.8	300.7
CASH DIVIDENDS PER SHARE (in dollars per share)	$ 0.01	$ 0.01	$ 0.02	$ 0.02

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
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