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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, 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]
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)
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									259.4	1,077.4	1,697.9
INVESTING ACTIVITIES
Maturities of short-term investments									2,042.5	2,212.0	1,357.3
Purchases of short-term investments									(1,040.0)	(2,474.6)	(1,780.0)
Purchase of Affiliate Debt									0.0	0.0
Acquisition of Atwood, net of cash acquired									(871.6)	0.0	0.0
Additions to property and equipment									(536.7)	(322.2)	(1,619.5)
Net proceeds from disposition of assets									2.8	9.8	1.6
Net cash used in investing activities of continuing operations									(403.0)	(575.0)	(2,040.6)
FINANCING ACTIVITIES
Reduction of long-term borrowings									(537.0)	(863.9)	(1,072.5)
Proceeds from issuance of senior notes									0.0	849.5	1,078.7
Proceeds from equity issuance									0.0	585.5	0.0
Debt financing costs									(12.0)	(23.4)	(10.5)
Cash dividends paid									(13.8)	(11.6)	(141.2)
Payment for Debt Extinguishment or Debt Prepayment Cost									0.0	0.0	(30.3)
Advances (to) from affiliates									0.0	0.0	0.0
Other									(7.7)	(7.1)	(16.0)
Net cash provided by (used in) financing activities									(570.5)	529.0	(191.8)
Net cash provided by (used in) discontinued operations									(0.8)	8.4	(8.7)
Effect of exchange rate changes on cash and cash equivalents									0.6	(1.4)	(0.3)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									(714.3)	1,038.4	(543.5)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				1,159.7				121.3	1,159.7	121.3	664.8
CASH AND CASH EQUIVALENTS, END OF YEAR	445.4				1,159.7				445.4	1,159.7	121.3
Loss on impairment	182.9	0.0	0.0	0.0					182.9	0.0	2,746.4
Depreciation expense	119.5	108.2	107.9	109.2	110.2	109.4	112.4	113.3	444.8	445.3	572.5
Deferred income tax expense (benefit)									55.0	28.7	(158.0)
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)
Share-based compensation expense									41.2	39.6	40.2
Gain (Loss) on Extinguishment of Debt				6.2					(2.6)	287.8	(33.5)
Other Noncash Income (Expense)									25.5	38.3	27.9
Increase (Decrease) in Other Operating Assets and Liabilities, Net									(65.4)	(140.6)	(113.5)
Ensco Plc [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									(303.7)	890.2	(1,594.8)
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									(18.2)	(101.3)	(71.1)
INVESTING ACTIVITIES
Maturities of short-term investments									1,748.0	2,062.0	1,312.0
Purchases of short-term investments									(1,022.9)	(2,047.1)	(1,780.0)
Purchase of Affiliate Debt									(316.3)	(237.9)
Acquisition of Atwood, net of cash acquired									0.0
Additions to property and equipment									0.0	0.0	0.0
Net proceeds from disposition of assets									0.0	0.0	0.3
Net cash used in investing activities of continuing operations									408.8	(223.0)	(467.7)
FINANCING ACTIVITIES
Reduction of long-term borrowings									(220.7)	(626.0)	(1,072.5)
Proceeds from issuance of senior notes										0.0	1,078.7
Proceeds from equity issuance										585.5
Debt financing costs									(12.0)	(23.4)	(10.5)
Cash dividends paid									(13.8)	(11.6)	(141.2)
Proceeds from Contributions from Affiliates										1,200.6	526.2
Payment for Debt Extinguishment or Debt Prepayment Cost											(30.3)
Advances (to) from affiliates									(848.9)
Other									(2.6)	(2.2)	(5.0)
Net cash provided by (used in) financing activities									(1,098.0)	1,122.9	345.4
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									(707.4)	798.6	(193.4)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				892.6				94.0	892.6	94.0	287.4
CASH AND CASH EQUIVALENTS, END OF YEAR	185.2				892.6				185.2	892.6	94.0
Loss on impairment									0.0		0.0
Depreciation expense									0.0	0.0	0.1
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									(79.2)	108.2	(1,524.8)
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									(117.6)	(46.5)	2.0
INVESTING ACTIVITIES
Maturities of short-term investments									5.5	0.0
Purchases of short-term investments									0.0	(5.5)	0.0
Purchase of Affiliate Debt									0.0	0.0
Acquisition of Atwood, net of cash acquired									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
Net cash used in investing activities of continuing operations									5.5	(5.5)	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
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									112.1	52.0
Payment for Debt Extinguishment or Debt Prepayment Cost											0.0
Advances (to) from affiliates											(2.0)
Other									0.0	0.0	0.0
Net cash provided by (used in) financing activities									112.1	52.0	(2.0)
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									15.9	17.2	13.8
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
Pride International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									12.5	49.2	(1,843.0)
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									(100.1)	(116.9)	(114.0)
INVESTING ACTIVITIES
Maturities of short-term investments									0.0	0.0	0.0
Purchases of short-term investments									0.0	0.0	0.0
Purchase of Affiliate Debt									0.0	0.0
Acquisition of Atwood, net of cash acquired									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
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
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									105.9	134.7	25.2
Payment for Debt Extinguishment or Debt Prepayment Cost											0.0
Other									0.0	0.0	0.0
Net cash provided by (used in) financing activities									105.9	134.7	25.2
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									5.8	17.8	(88.8)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				19.8				2.0	19.8	2.0	90.8
CASH AND CASH EQUIVALENTS, END OF YEAR	25.6				19.8				25.6	19.8	2.0
Loss on impairment									0.0		0.0
Depreciation expense									0.0	0.4	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)									11.1	890.7	(1,443.8)
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									495.3	1,342.1	1,881.0
INVESTING ACTIVITIES
Maturities of short-term investments									289.0	150.0	45.3
Purchases of short-term investments									(17.1)	(422.0)	0.0
Purchase of Affiliate Debt									0.0	0.0
Acquisition of Atwood, net of cash acquired									(871.6)
Additions to property and equipment									(536.7)	(322.2)	(1,619.5)
Net proceeds from disposition of assets									2.8	9.8	1.3
Net cash used in investing activities of continuing operations									(1,133.6)	(584.4)	(1,572.9)
FINANCING ACTIVITIES
Reduction of long-term borrowings									0.0	0.0	0.0
Proceeds from issuance of senior notes										849.5	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									630.9
Payment for Debt Extinguishment or Debt Prepayment Cost											0.0
Advances (to) from affiliates										(1,387.3)	(549.4)
Other									(5.1)	(4.9)	(11.0)
Net cash provided by (used in) financing activities									625.8	(542.7)	(560.4)
Net cash provided by (used in) discontinued operations									(0.8)	8.4	(8.7)
Effect of exchange rate changes on cash and cash equivalents									0.6	(1.4)	(0.3)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									(12.7)	222.0	(261.3)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				247.3				25.3	247.3	25.3	286.6
CASH AND CASH EQUIVALENTS, END OF YEAR	234.6				247.3				234.6	247.3	25.3
Loss on impairment									182.9		2,746.4
Depreciation expense									428.9	427.7	558.6
DISCONTINUED OPERATIONS, NET									1.0	8.1	(128.6)
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									55.1	(1,041.2)	4,820.5
OPERATING ACTIVITIES
Net cash provided by operating activities of continuing operations									0.0	0.0	0.0
INVESTING ACTIVITIES
Maturities of short-term investments									0.0	0.0	0.0
Purchases of short-term investments									0.0	0.0	0.0
Purchase of Affiliate Debt									316.3	237.9
Acquisition of Atwood, net of cash acquired									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
Net cash used in investing activities of continuing operations									316.3	237.9	0.0
FINANCING ACTIVITIES
Reduction of long-term borrowings									(316.3)	(237.9)	0.0
Proceeds from issuance of senior notes										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
Payment for Debt Extinguishment or Debt Prepayment Cost											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									(316.3)	(237.9)	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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