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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Guarantor Obligations [Line Items]
OPERATING REVENUES	$ 454.2	$ 460.2	$ 457.5	$ 471.1	$ 504.6	$ 548.2	$ 909.6	$ 814.0	$ 1,843.0	$ 2,776.4	$ 4,063.4
Contract drilling (exclusive of depreciation)	334.3	285.8	291.3	278.1	289.0	298.1	350.2	363.7	1,189.5	1,301.0	1,869.6
Loss on impairment	182.9	0.0	0.0	0.0					182.9	0.0	2,746.4
Depreciation	119.5	108.2	107.9	109.2	110.2	109.4	112.4	113.3	444.8	445.3	572.5
General and administrative	70.9	30.4	30.5	26.0	24.7	25.3	27.4	23.4	157.8	100.8	118.4
OPERATING INCOME (LOSS)	(253.4)	35.8	27.8	57.8	80.7	115.4	419.6	313.6	(132.0)	929.3	(1,243.5)
OTHER (EXPENSE) INCOME, NET	87.3	(40.4)	(53.2)	(57.7)	(46.2)	(30.9)	209.9	(64.6)	(64.0)	68.2	(227.7)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(166.1)	(4.6)	(25.4)	0.1	34.5	84.5	629.5	249.0	(196.0)	997.5	(1,471.2)
Total provision for income taxes	42.4	23.4	19.3	24.1	3.9	(3.5)	36.7	71.4	109.2	108.5	(13.9)
DISCONTINUED OPERATIONS, NET	1.4	(0.2)	0.4	(0.6)	9.9	(0.7)	(0.2)	(0.9)	1.0	8.1	(128.6)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									0.0	0.0	0.0
NET INCOME (LOSS)	(207.1)	(28.2)	(44.3)	(24.6)	40.5	87.3	592.6	176.7	(304.2)	897.1	(1,585.9)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	2.8	(1.2)	(1.1)	(1.5)	(2.0)	(2.0)	(1.4)	0.5	(6.9)	(8.9)
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO	$ (207.1)	$ (25.4)	$ (45.5)	$ (25.7)	$ 39.0	$ 85.3	$ 590.6	$ 175.3	(303.7)	890.2	(1,594.8)
Ensco Plc [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									52.9	27.9	31.7
Contract drilling (exclusive of depreciation)									50.0	27.3	29.2
Loss on impairment									0.0		0.0
Depreciation									0.0	0.0	0.1
General and administrative									45.4	36.2	51.5
OPERATING INCOME (LOSS)									(42.5)	(35.6)	(49.1)
OTHER (EXPENSE) INCOME, NET									(6.8)	152.9	(169.5)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									(49.3)	117.3	(218.6)
Total provision for income taxes									0.0	0.0	0.0
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									(254.4)	772.9	(1,376.2)
NET INCOME (LOSS)									(303.7)	890.2	(1,594.8)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO									(303.7)	890.2	(1,594.8)
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									163.3	144.4	163.5
Contract drilling (exclusive of depreciation)									149.9	144.8	163.5
Loss on impairment									0.0		0.0
Depreciation									15.9	17.2	13.8
General and administrative									50.8	0.2	0.2
OPERATING INCOME (LOSS)									(53.3)	(17.8)	(14.0)
OTHER (EXPENSE) INCOME, NET									(110.5)	(79.0)	(28.6)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									(163.8)	(96.8)	(42.6)
Total provision for income taxes									45.0	0.7	(190.6)
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									129.6	205.7	(1,672.8)
NET INCOME (LOSS)									(79.2)	108.2	(1,524.8)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO									(79.2)	108.2	(1,524.8)
Pride International Inc. [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									0.0	0.0	0.0
Contract drilling (exclusive of depreciation)									0.0	0.1	0.0
Loss on impairment									0.0		0.0
Depreciation									0.0	0.4	0.0
General and administrative									0.0	0.0	0.0
OPERATING INCOME (LOSS)									0.0	(0.5)	0.0
OTHER (EXPENSE) INCOME, NET									(71.7)	(76.6)	(71.5)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									(71.7)	(77.1)	(71.5)
Total provision for income taxes									0.0	(0.6)	0.0
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									84.2	125.7	(1,771.5)
NET INCOME (LOSS)									12.5	49.2	(1,843.0)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO									12.5	49.2	(1,843.0)
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									1,941.2	2,897.4	4,199.4
Contract drilling (exclusive of depreciation)									1,304.0	1,422.1	2,008.1
Loss on impairment									182.9		2,746.4
Depreciation									428.9	427.7	558.6
General and administrative									61.6	64.4	66.7
OPERATING INCOME (LOSS)									(36.2)	983.2	(1,180.4)
OTHER (EXPENSE) INCOME, NET									110.5	7.8	41.9
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									74.3	991.0	(1,138.5)
Total provision for income taxes									64.2	108.4	176.7
DISCONTINUED OPERATIONS, NET									1.0	8.1	(128.6)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									0.0	0.0	0.0
NET INCOME (LOSS)									11.1	890.7	(1,443.8)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.5	(6.9)	(8.9)
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO									11.6	883.8	(1,452.7)
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									(314.4)	(293.3)	(331.2)
Contract drilling (exclusive of depreciation)									(314.4)	(293.3)	(331.2)
Loss on impairment									0.0		0.0
Depreciation									0.0	0.0	0.0
General and administrative									0.0	0.0	0.0
OPERATING INCOME (LOSS)									0.0	0.0	0.0
OTHER (EXPENSE) INCOME, NET									14.5	63.1	0.0
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									14.5	63.1	0.0
Total provision for income taxes									0.0	0.0	0.0
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									40.6	(1,104.3)	4,820.5
NET INCOME (LOSS)									55.1	(1,041.2)	4,820.5
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO									$ 55.1	$ (1,041.2)	$ 4,820.5

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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.

+ 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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