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Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
NET (LOSS) INCOME	$ (44.3)	$ 592.6	$ (68.9)	$ 769.3
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in derivative fair value	2.9	(4.1)	6.0	(0.6)
Reclassification of net losses on derivative instruments from other comprehensive income into net (loss) income	0.3	2.0	1.2	7.9
Other	0.2	0.1	0.7	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	3.4	(2.0)	7.9	7.3
COMPREHENSIVE (LOSS) INCOME	(40.9)	590.6	(61.0)	776.6
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1.2)	(2.0)	(2.3)	(3.4)
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	$ (42.1)	$ 588.6	$ (63.3)	$ 773.2

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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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