Accumulated Other Comprehensive Income, Gains And Losses On Derivative Instruments, Other

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

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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. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Guarantor Obligations [Line Items]
NET INCOME (LOSS)	$ (203.1)	$ (142.9)	$ (150.1)	$ (140.5)	$ (207.1)	$ (28.2)	$ (44.3)	$ (24.6)	$ (636.6)	$ (304.2)	$ 897.1
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									(9.7)	8.5	(5.4)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) into net income (loss)									(1.0)	0.4	12.4
Other									(0.5)	0.7	(0.5)
NET OTHER COMPREHENSIVE INCOME (LOSS)									(11.2)	9.6	6.5
COMPREHENSIVE INCOME (LOSS)									(647.8)	(294.6)	903.6
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									(3.1)	0.5	(6.9)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									(650.9)	(294.1)	896.7
Ensco Plc [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									(639.7)	(303.7)	890.2
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) 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)									(639.7)	(303.7)	890.2
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									(639.7)	(303.7)	890.2
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									(55.6)	(79.2)	108.2
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									(9.7)	8.5	(5.4)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) into net income (loss)									(1.0)	0.4	12.4
Other									0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									(10.7)	8.9	7.0
COMPREHENSIVE INCOME (LOSS)									(66.3)	(70.3)	115.2
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									(66.3)	(70.3)	115.2
Pride International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									4.3	12.5	49.2
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) 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)									4.3	12.5	49.2
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									4.3	12.5	49.2
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									(352.6)	11.1	890.7
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) into net income (loss)									0.0	0.0	0.0
Other									(0.5)	0.7	(0.5)
NET OTHER COMPREHENSIVE INCOME (LOSS)									(0.5)	0.7	(0.5)
COMPREHENSIVE INCOME (LOSS)									(353.1)	11.8	890.2
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									(3.1)	0.5	(6.9)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									(356.2)	12.3	883.3
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									407.0	55.1	(1,041.2)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) 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)									407.0	55.1	(1,041.2)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									$ 407.0	$ 55.1	$ (1,041.2)