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Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
OPERATING REVENUES	$ 460.2	$ 548.2	$ 1,388.8	$ 2,271.8
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	285.8	298.1	855.2	1,012.0
Depreciation	108.2	109.4	325.3	335.1
General and administrative	30.4	25.3	86.9	76.1
Total operating expenses	424.4	432.8	1,267.4	1,423.2
OPERATING INCOME	35.8	115.4	121.4	848.6
OTHER INCOME (EXPENSE)
Interest income	7.5	3.8	22.3	8.6
Interest expense, net	(48.1)	(53.4)	(167.0)	(172.5)
Other, net	0.2	18.7	(6.6)	278.3
Other income (expense), net	(40.4)	(30.9)	(151.3)	114.4
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(4.6)	84.5	(29.9)	963.0
PROVISION FOR INCOME TAXES
Current income tax expense	14.9	(5.7)	32.3	81.0
Deferred income tax expense	8.5	2.2	34.5	23.6
Total provision for income taxes	23.4	(3.5)	66.8	104.6
(LOSS) INCOME FROM CONTINUING OPERATIONS	(28.0)	88.0	(96.7)	858.4
LOSS FROM DISCONTINUED OPERATIONS, NET	(0.2)	(0.7)	(0.4)	(1.8)
NET (LOSS) INCOME	(28.2)	87.3	(97.1)	856.6
NET LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	2.8	(2.0)	0.5	(5.4)
NET (LOSS) INCOME ATTRIBUTABLE TO ENSCO	$ (25.4)	$ 85.3	$ (96.6)	$ 851.2
(LOSS) EARNINGS PER SHARE - BASIC AND DILUTED
Continuing operations (in dollars per share)	$ (0.08)	$ 0.28	$ (0.32)	$ 3.07
Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
(Loss) earnings per share - basic and diluted (in dollars per share)	$ (0.08)	$ 0.28	$ (0.32)	$ 3.07
NET (LOSS) INCOME ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED	$ (25.5)	$ 83.5	$ (96.9)	$ 836.1
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic and Diluted (in shares)	301.2	298.6	300.9	272.0
CASH DIVIDENDS PER SHARE (in dollars per share)	$ 0.01	$ 0.01	$ 0.03	$ 0.03

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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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