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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Guarantor Obligations [Line Items]
NET INCOME	$ (2,470.3)	$ 293.8	$ 262.7	$ 327.9	$ (3,448.5)	$ 432.9	$ (1,169.6)	$ 296.7	$ (1,585.9)	$ (3,888.5)	$ 1,427.9
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									1,697.9	2,057.9	1,811.2
INVESTING ACTIVITIES
Additions to property and equipment									(1,619.5)	(1,566.7)	(1,763.5)
Purchases of short-term investments									(1,780.0)	(790.6)	(50.0)
Maturities of short-term investments									1,357.3	83.3	50.0
Payments for (Proceeds from) Other Investing Activities											6.0
Proceeds from Sale of Property, Plant, and Equipment									1.6	169.2	6.0
Net cash used in investing activities of continuing operations									(2,040.6)	(2,104.8)	(1,757.5)
FINANCING ACTIVITIES
Proceeds from issuance of senior notes									1,078.7	1,246.4	0.0
Cash dividends paid									(141.2)	(703.0)	(525.6)
Reduction of long-term borrowings									(1,072.5)	(60.1)	(47.5)
Proceeds from exercise of share options									0.3	2.6	22.3
Payments of Debt Extinguishment Costs									(30.3)	0.0	0.0
Debt financing costs									(10.5)	(13.4)	(4.6)
Advances (to) from affiliates									0.0	0.0	0.0
Other									(16.3)	(29.8)	(21.7)
Net cash (used in) provided by financing activities of continuing operations									(191.8)	442.7	(577.1)
DISCONTINUED OPERATIONS
Operating activities									(10.9)	(3.8)	169.3
Investing activities									2.2	107.2	32.8
Net cash provided by discontinued operations									(8.7)	103.4	202.1
Effect of exchange rate changes on cash and cash equivalents									(0.3)	0.0	(0.2)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									(543.5)	499.2	(321.5)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				664.8				165.6	664.8	165.6	487.1
CASH AND CASH EQUIVALENTS, END OF YEAR	121.3				664.8				121.3	664.8	165.6
Asset Impairment Charges	2,744.0	2.4	0.0	0.0	3,515.2	0.0	703.5	0.0	2,746.4	4,218.7	0.0
Cost of Services, Depreciation	149.7	145.2	140.5	137.1	139.4	135.2	132.2	131.1	572.5	537.9	496.2
Deferred income tax expense (benefit)									(158.0)	(123.5)	10.1
DISCONTINUED OPERATIONS, NET	(95.0)	$ (23.3)	$ (10.1)	(0.2)	(388.0)	$ 9.2	$ (818.4)	(2.0)	(128.6)	(1,199.2)	(2.2)
Share-based compensation expense									40.2	45.1	50.3
Gains (Losses) on Extinguishment of Debt									(33.5)	0.0	0.0
Provision for Doubtful Accounts									24.1	(5.0)	11.7
Amortization of intangibles and other, net									(1.4)	(7.9)	(28.4)
Other Noncash Income (Expense)									18.1	11.4	7.7
Increase (Decrease) in Other Operating Assets and Liabilities, Net									84.0	(93.3)	151.1
Ensco Plc [Member]
Guarantor Obligations [Line Items]
NET INCOME									(1,594.8)	(3,902.6)	1,418.2
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									(71.1)	(63.8)	(114.8)
INVESTING ACTIVITIES
Additions to property and equipment									0.0	0.0	0.0
Purchases of short-term investments									(1,780.0)	(716.1)	0.0
Maturities of short-term investments									1,312.0	0.0	0.0
Payments for (Proceeds from) Other Investing Activities											0.0
Proceeds from Sale of Property, Plant, and Equipment									0.3	0.0
Net cash used in investing activities of continuing operations									(467.7)	(716.1)	0.0
FINANCING ACTIVITIES
Proceeds from issuance of senior notes									1,078.7	1,246.4
Cash dividends paid									(141.2)	(703.0)	(525.6)
Reduction of long-term borrowings									(1,072.5)	0.0	0.0
Proceeds from exercise of share options									0.3	2.6	22.3
Payments of Debt Extinguishment Costs									(30.3)
Debt financing costs									(10.5)	(13.4)	0.0
Advances (to) from affiliates									526.2	501.9	407.2
Other									(5.3)	(13.7)	(14.4)
Net cash (used in) provided by financing activities of continuing operations									345.4	1,020.8	(110.5)
DISCONTINUED OPERATIONS
Operating activities									0.0	0.0	0.0
Investing activities									0.0	0.0	0.0
Net cash provided by discontinued operations									0.0	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents									0.0	0.0	0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									(193.4)	240.9	(225.3)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				287.4				46.5	287.4	46.5	271.8
CASH AND CASH EQUIVALENTS, END OF YEAR	94.0				287.4				94.0	287.4	46.5
Asset Impairment Charges									0.0	0.0
Cost of Services, Depreciation									0.1	0.2	0.3
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME									(1,524.8)	(3,657.4)	259.8
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									2.0	(167.6)	(128.7)
INVESTING ACTIVITIES
Additions to property and equipment									0.0	(37.2)	0.0
Purchases of short-term investments									0.0	0.0	0.0
Maturities of short-term investments									0.0	0.0	0.0
Payments for (Proceeds from) Other Investing Activities											(4.1)
Proceeds from Sale of Property, Plant, and Equipment									0.0	0.0
Net cash used in investing activities of continuing operations									0.0	(37.2)	(4.1)
FINANCING ACTIVITIES
Proceeds from issuance of senior notes									0.0	0.0
Cash dividends paid									0.0	0.0	0.0
Reduction of long-term borrowings									0.0	0.0	0.0
Proceeds from exercise of share options									0.0	0.0	0.0
Payments of Debt Extinguishment Costs									0.0
Debt financing costs									0.0	0.0	(4.6)
Advances (to) from affiliates									(2.0)	204.3	136.2
Other									0.0	0.0	0.0
Net cash (used in) provided by financing activities of continuing operations									(2.0)	204.3	131.6
DISCONTINUED OPERATIONS
Operating activities									0.0	0.0	0.0
Investing activities									0.0	0.0	0.0
Net cash provided by discontinued operations									0.0	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents									0.0	0.0	0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									0.0	(0.5)	(1.2)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				0.0				0.5	0.0	0.5	1.7
CASH AND CASH EQUIVALENTS, END OF YEAR	0.0				0.0				0.0	0.0	0.5
Asset Impairment Charges									0.0	0.0
Cost of Services, Depreciation									13.8	7.6	4.0
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
Pride International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME									(1,843.0)	(3,799.0)	83.7
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									(114.0)	(90.9)	(62.9)
INVESTING ACTIVITIES
Additions to property and equipment									0.0	0.0	0.0
Purchases of short-term investments									0.0	0.0	0.0
Maturities of short-term investments									0.0	0.0	0.0
Payments for (Proceeds from) Other Investing Activities											0.0
Proceeds from Sale of Property, Plant, and Equipment									0.0	0.0
Net cash used in investing activities of continuing operations									0.0	0.0	0.0
FINANCING ACTIVITIES
Proceeds from issuance of senior notes									0.0	0.0
Cash dividends paid									0.0	0.0	0.0
Reduction of long-term borrowings									0.0	0.0	0.0
Proceeds from exercise of share options									0.0	0.0	0.0
Payments of Debt Extinguishment Costs									0.0
Debt financing costs									0.0	0.0	0.0
Advances (to) from affiliates									25.2	176.8	(17.2)
Other									0.0	0.0	0.0
Net cash (used in) provided by financing activities of continuing operations									25.2	176.8	(17.2)
DISCONTINUED OPERATIONS
Operating activities									0.0	0.0	0.0
Investing activities									0.0	0.0	0.0
Net cash provided by discontinued operations									0.0	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents									0.0	0.0	0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									(88.8)	85.9	(80.1)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				90.8				4.9	90.8	4.9	85.0
CASH AND CASH EQUIVALENTS, END OF YEAR	2.0				90.8				2.0	90.8	4.9
Asset Impairment Charges									0.0	0.0
Cost of Services, Depreciation									0.0	0.0	0.0
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
NET INCOME									(1,443.8)	(3,710.9)	1,684.1
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									1,881.0	2,380.2	2,117.6
INVESTING ACTIVITIES
Additions to property and equipment									(1,619.5)	(1,529.5)	(1,763.5)
Purchases of short-term investments									0.0	(74.5)	(50.0)
Maturities of short-term investments									45.3	83.3	50.0
Payments for (Proceeds from) Other Investing Activities											10.1
Proceeds from Sale of Property, Plant, and Equipment									1.3	169.2
Net cash used in investing activities of continuing operations									(1,572.9)	(1,351.5)	(1,753.4)
FINANCING ACTIVITIES
Proceeds from issuance of senior notes									0.0	0.0
Cash dividends paid									0.0	0.0	0.0
Reduction of long-term borrowings									0.0	(60.1)	(47.5)
Proceeds from exercise of share options									0.0	0.0	0.0
Payments of Debt Extinguishment Costs									0.0
Debt financing costs									0.0	0.0	0.0
Advances (to) from affiliates									(549.4)	(883.0)	(526.2)
Other									(11.0)	(16.1)	(7.3)
Net cash (used in) provided by financing activities of continuing operations									(560.4)	(959.2)	(581.0)
DISCONTINUED OPERATIONS
Operating activities									(10.9)	(3.8)	169.3
Investing activities									2.2	107.2	32.8
Net cash provided by discontinued operations									(8.7)	103.4	202.1
Effect of exchange rate changes on cash and cash equivalents									(0.3)	0.0	(0.2)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									(261.3)	172.9	(14.9)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				286.6				113.7	286.6	113.7	128.6
CASH AND CASH EQUIVALENTS, END OF YEAR	25.3				286.6				25.3	286.6	113.7
Asset Impairment Charges									2,746.4	4,218.7
Cost of Services, Depreciation									558.6	530.1	491.9
DISCONTINUED OPERATIONS, NET									(128.6)	(1,199.2)	(2.2)
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
NET INCOME									4,820.5	11,181.4	(2,017.9)
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									0.0	0.0	0.0
INVESTING ACTIVITIES
Additions to property and equipment									0.0	0.0	0.0
Purchases of short-term investments									0.0	0.0	0.0
Maturities of short-term investments									0.0	0.0	0.0
Payments for (Proceeds from) Other Investing Activities											0.0
Proceeds from Sale of Property, Plant, and Equipment									0.0	0.0
Net cash used in investing activities of continuing operations									0.0	0.0	0.0
FINANCING ACTIVITIES
Proceeds from issuance of senior notes									0.0	0.0
Cash dividends paid									0.0	0.0	0.0
Reduction of long-term borrowings									0.0	0.0	0.0
Proceeds from exercise of share options									0.0	0.0	0.0
Payments of Debt Extinguishment Costs									0.0
Debt financing costs									0.0	0.0	0.0
Advances (to) from affiliates									0.0	0.0	0.0
Other									0.0	0.0	0.0
Net cash (used in) provided by financing activities of continuing operations									0.0	0.0	0.0
DISCONTINUED OPERATIONS
Operating activities									0.0	0.0	0.0
Investing activities									0.0	0.0	0.0
Net cash provided by discontinued operations									0.0	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents									0.0	0.0	0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									0.0	0.0	0.0
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				$ 0.0				$ 0.0	0.0	0.0	0.0
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 0.0				$ 0.0				0.0	0.0	0.0
Asset Impairment Charges									0.0	0.0
Cost of Services, Depreciation									0.0	0.0	0.0
DISCONTINUED OPERATIONS, NET									$ 0.0	$ 0.0	$ 0.0

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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-Section 45
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