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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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Guarantor Obligations [Line Items]
NET INCOME (LOSS)	$ 40.5	$ 87.3	$ 592.6	$ 176.7	$ (2,470.3)	$ 293.8	$ 262.7	$ 327.9	$ 897.1	$ (1,585.9)	$ (3,888.5)
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									1,077.4	1,697.9	2,057.9
INVESTING ACTIVITIES
Purchases of short-term investments									(2,474.6)	(1,780.0)	(790.6)
Maturities of short-term investments									2,212.0	1,357.3	83.3
Additions to property and equipment									(322.2)	(1,619.5)	(1,566.7)
Net proceeds from disposition of assets									9.8	1.6	169.2
Purchase of Affiliate Debt										0.0
Net cash used in investing activities of continuing operations									(575.0)	(2,040.6)	(2,104.8)
FINANCING ACTIVITIES
Reduction of long-term borrowings									(863.9)	(1,072.5)	(60.1)
Proceeds from issuance of senior notes									849.5	1,078.7	1,246.4
Proceeds from equity issuance									585.5	0.0	0.0
Debt financing costs									(23.4)	(10.5)	(13.4)
Cash dividends paid									(11.6)	(141.2)	(703.0)
Payments of Debt Extinguishment Costs									0.0	(30.3)	0.0
Advances (to) from affiliates									0.0	0.0	0.0
Other									(7.1)	(16.0)	(27.2)
Net cash provided by (used in) financing activities									529.0	(191.8)	442.7
DISCONTINUED OPERATIONS
Operating activities									2.1	(10.9)	(3.8)
Investing activities									6.3	2.2	107.2
Net Cash Provided by (Used in) Discontinued Operations									8.4	(8.7)	103.4
Effect of exchange rate changes on cash and cash equivalents									(1.4)	(0.3)	0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									1,038.4	(543.5)	499.2
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				121.3				664.8	121.3	664.8	165.6
CASH AND CASH EQUIVALENTS, END OF YEAR	1,159.7				121.3				1,159.7	121.3	664.8
Loss on impairment					2,744.0	2.4	0.0	0.0	0.0	2,746.4	4,218.7
Depreciation expense	110.2	109.4	112.4	113.3	149.7	145.2	140.5	137.1	445.3	572.5	537.9
Deferred income tax expense (benefit)									28.7	(158.0)	(123.5)
DISCONTINUED OPERATIONS, NET	9.9	$ (0.7)	$ (0.2)	(0.9)	(95.0)	$ (23.3)	$ (10.1)	(0.2)	8.1	(128.6)	(1,199.2)
Share-based Compensation									39.6	40.2	45.1
Gains (Losses) on Extinguishment of Debt									287.8	(33.5)	0.0
Bad debt provision									(5.7)	24.1	(5.0)
Other Noncash Income (Expense)									3.0	18.1	11.4
Increase (Decrease) in Other Operating Assets and Liabilities, Net									8.2	84.0	(93.3)
Ensco Plc [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									890.2	(1,594.8)	(3,902.6)
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									(101.3)	(71.1)	(63.8)
INVESTING ACTIVITIES
Purchases of short-term investments									2,047.1	(1,780.0)	(716.1)
Maturities of short-term investments									2,062.0	1,312.0	0.0
Additions to property and equipment									0.0	0.0	0.0
Net proceeds from disposition of assets									0.0	0.3	0.0
Purchase of Affiliate Debt										(237.9)
Net cash used in investing activities of continuing operations									(223.0)	(467.7)	(716.1)
FINANCING ACTIVITIES
Reduction of long-term borrowings									(626.0)	(1,072.5)	0.0
Proceeds from issuance of senior notes									0.0	1,078.7	1,246.4
Proceeds from equity issuance									585.5
Debt financing costs									(23.4)	(10.5)	(13.4)
Cash dividends paid									(11.6)	(141.2)	(703.0)
Proceeds from Contributions from Affiliates									1,200.6	526.2	501.9
Payments of Debt Extinguishment Costs										(30.3)
Other									(2.2)	(5.0)	(11.1)
Net cash provided by (used in) financing activities									1,122.9	345.4	1,020.8
DISCONTINUED OPERATIONS
Operating activities									0.0	0.0	0.0
Investing activities									0.0	0.0	0.0
Net Cash Provided by (Used in) 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									798.6	(193.4)	240.9
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				94.0				287.4	94.0	287.4	46.5
CASH AND CASH EQUIVALENTS, END OF YEAR	892.6				94.0				892.6	94.0	287.4
Loss on impairment										0.0	0.0
Depreciation expense									0.0	0.1	0.2
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									108.2	(1,524.8)	(3,657.4)
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									(46.5)	2.0	(167.6)
INVESTING ACTIVITIES
Purchases of short-term investments									5.5	0.0	0.0
Maturities of short-term investments									0.0	0.0	0.0
Additions to property and equipment									0.0	0.0	(37.2)
Net proceeds from disposition of assets									0.0	0.0	0.0
Purchase of Affiliate Debt										0.0
Net cash used in investing activities of continuing operations									(5.5)	0.0	(37.2)
FINANCING ACTIVITIES
Reduction of long-term borrowings									0.0	0.0	0.0
Proceeds from issuance of senior notes									0.0	0.0	0.0
Proceeds from equity issuance									0.0
Debt financing costs									0.0	0.0	0.0
Cash dividends paid									0.0	0.0	0.0
Proceeds from Contributions from Affiliates									52.0		204.3
Payments of Debt Extinguishment Costs										0.0
Advances (to) from affiliates										(2.0)
Other									0.0	0.0	0.0
Net cash provided by (used in) financing activities									52.0	(2.0)	204.3
DISCONTINUED OPERATIONS
Operating activities									0.0	0.0	0.0
Investing activities									0.0	0.0	0.0
Net Cash Provided by (Used in) 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	(0.5)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				0.0				0.0	0.0	0.0	0.5
CASH AND CASH EQUIVALENTS, END OF YEAR	0.0				0.0				0.0	0.0	0.0
Loss on impairment										0.0	0.0
Depreciation expense									17.2	13.8	7.6
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
Pride International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									49.2	(1,843.0)	(3,799.0)
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									(116.9)	(114.0)	(90.9)
INVESTING ACTIVITIES
Purchases of short-term investments									0.0	0.0	0.0
Maturities of short-term investments									0.0	0.0	0.0
Additions to property and equipment									0.0	0.0	0.0
Net proceeds from disposition of assets									0.0	0.0	0.0
Purchase of Affiliate Debt										0.0
Net cash used in investing activities of continuing operations									0.0	0.0	0.0
FINANCING ACTIVITIES
Reduction of long-term borrowings									0.0	0.0	0.0
Proceeds from issuance of senior notes									0.0	0.0	0.0
Proceeds from equity issuance									0.0
Debt financing costs									0.0	0.0	0.0
Cash dividends paid									0.0	0.0	0.0
Proceeds from Contributions from Affiliates									134.7	25.2	176.8
Payments of Debt Extinguishment Costs										0.0
Other									0.0	0.0	0.0
Net cash provided by (used in) financing activities									134.7	25.2	176.8
DISCONTINUED OPERATIONS
Operating activities									0.0	0.0	0.0
Investing activities									0.0	0.0	0.0
Net Cash Provided by (Used in) 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									17.8	(88.8)	85.9
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				2.0				90.8	2.0	90.8	4.9
CASH AND CASH EQUIVALENTS, END OF YEAR	19.8				2.0				19.8	2.0	90.8
Loss on impairment										0.0	0.0
Depreciation expense									0.4	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 (LOSS)									890.7	(1,443.8)	(3,710.9)
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									1,342.1	1,881.0	2,380.2
INVESTING ACTIVITIES
Purchases of short-term investments									422.0	0.0	(74.5)
Maturities of short-term investments									150.0	45.3	83.3
Additions to property and equipment									(322.2)	(1,619.5)	(1,529.5)
Net proceeds from disposition of assets									9.8	1.3	169.2
Purchase of Affiliate Debt										0.0
Net cash used in investing activities of continuing operations									(584.4)	(1,572.9)	(1,351.5)
FINANCING ACTIVITIES
Reduction of long-term borrowings									0.0	0.0	(60.1)
Proceeds from issuance of senior notes									849.5	0.0	0.0
Proceeds from equity issuance									0.0
Debt financing costs									0.0	0.0	0.0
Cash dividends paid									0.0	0.0	0.0
Payments of Debt Extinguishment Costs										0.0
Advances (to) from affiliates									(1,387.3)	(549.4)	(883.0)
Other									(4.9)	(11.0)	(16.1)
Net cash provided by (used in) financing activities									(542.7)	(560.4)	(959.2)
DISCONTINUED OPERATIONS
Operating activities									2.1	(10.9)	(3.8)
Investing activities									6.3	2.2	107.2
Net Cash Provided by (Used in) Discontinued Operations									8.4	(8.7)	103.4
Effect of exchange rate changes on cash and cash equivalents									(1.4)	(0.3)	0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									222.0	(261.3)	172.9
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				25.3				286.6	25.3	286.6	113.7
CASH AND CASH EQUIVALENTS, END OF YEAR	247.3				25.3				247.3	25.3	286.6
Loss on impairment										2,746.4	4,218.7
Depreciation expense									427.7	558.6	530.1
DISCONTINUED OPERATIONS, NET									8.1	(128.6)	(1,199.2)
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									(1,041.2)	4,820.5	11,181.4
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									0.0	0.0	0.0
INVESTING ACTIVITIES
Purchases of short-term investments									0.0	0.0	0.0
Maturities of short-term investments									0.0	0.0	0.0
Additions to property and equipment									0.0	0.0	0.0
Net proceeds from disposition of assets									0.0	0.0	0.0
Purchase of Affiliate Debt										237.9
Net cash used in investing activities of continuing operations									237.9	0.0	0.0
FINANCING ACTIVITIES
Reduction of long-term borrowings									(237.9)	0.0	0.0
Proceeds from issuance of senior notes									0.0	0.0	0.0
Proceeds from equity issuance									0.0
Debt financing costs									0.0	0.0	0.0
Cash dividends paid									0.0	0.0	0.0
Payments of Debt Extinguishment Costs										0.0
Advances (to) from affiliates									0.0	0.0	0.0
Other									0.0	0.0	0.0
Net cash provided by (used in) financing activities									(237.9)	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 (Used in) 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
Loss on impairment										0.0	0.0
Depreciation expense									0.0	0.0	0.0
DISCONTINUED OPERATIONS, NET									$ 0.0	$ 0.0	$ 0.0

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