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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	$ 40.5	$ 87.3	$ 592.6	$ 176.7	$ (2,470.3)	$ 293.8	$ 262.7	$ 327.9	$ 897.1	$ (1,585.9)	$ (3,888.5)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									(5.4)	(23.6)	(11.7)
Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income									12.4	22.2	(0.9)
Other									(0.5)	2.0	6.3
NET OTHER COMPREHENSIVE INCOME (LOSS)									6.5	0.6	(6.3)
COMPREHENSIVE INCOME (LOSS)									903.6	(1,585.3)	(3,894.8)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									(6.9)	(8.9)	(14.1)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									$ 896.7	$ (1,594.2)	$ (3,908.9)

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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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