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Consolidated Statements of Comprehensive Income (Loss) - 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
Statement of Comprehensive Income [Abstract]
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)

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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 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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