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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	$ 293.8	$ 432.9	$ 884.4	$ (440.0)
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	(14.8)	(12.7)	(23.5)	(2.8)
Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income	5.8	(1.4)	15.9	(3.3)
Other	2.9	3.7	4.2	4.2
NET OTHER COMPREHENSIVE LOSS	(6.1)	(10.4)	(3.4)	(1.9)
COMPREHENSIVE INCOME (LOSS)	287.7	422.5	881.0	(441.9)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1.8)	(3.5)	(7.4)	(10.8)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO	$ 285.9	$ 419.0	$ 873.6	$ (452.7)

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