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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Comprehensive 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]
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)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									8.5	(5.4)	(23.6)
Reclassification of net losses on derivative instruments from other comprehensive income into net income (loss)									0.4	12.4	22.2
Other									0.7	(0.5)	2.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									9.6	6.5	0.6
COMPREHENSIVE INCOME (LOSS)									(294.6)	903.6	(1,585.3)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.5	(6.9)	(8.9)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									(294.1)	896.7	(1,594.2)
Ensco Plc [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									(303.7)	890.2	(1,594.8)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net losses on derivative instruments from other comprehensive income into net income (loss)									0.0	0.0	0.0
Other									0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS)									(303.7)	890.2	(1,594.8)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									(303.7)	890.2	(1,594.8)
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									(79.2)	108.2	(1,524.8)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									8.5	(5.4)	(23.6)
Reclassification of net losses on derivative instruments from other comprehensive income into net income (loss)									0.4	12.4	22.2
Other									0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									8.9	7.0	(1.4)
COMPREHENSIVE INCOME (LOSS)									(70.3)	115.2	(1,526.2)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									(70.3)	115.2	(1,526.2)
Pride International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									12.5	49.2	(1,843.0)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net losses on derivative instruments from other comprehensive income into net income (loss)									0.0	0.0	0.0
Other									0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS)									12.5	49.2	(1,843.0)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									12.5	49.2	(1,843.0)
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									11.1	890.7	(1,443.8)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net losses on derivative instruments from other comprehensive income into net income (loss)									0.0	0.0	0.0
Other									0.7	(0.5)	2.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									0.7	(0.5)	2.0
COMPREHENSIVE INCOME (LOSS)									11.8	890.2	(1,441.8)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.5	(6.9)	(8.9)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									12.3	883.3	(1,450.7)
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									55.1	(1,041.2)	4,820.5
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net losses on derivative instruments from other comprehensive income into net income (loss)									0.0	0.0	0.0
Other									0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS)									55.1	(1,041.2)	4,820.5
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									$ 55.1	$ (1,041.2)	$ 4,820.5

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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