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Earnings Per Share (Reconciliation Of Net Income Attributable To Ensco Shares) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations Attributable to Parent	$ (140.0)	$ (25.1)
Net income allocated to non-vested share awards	(0.1)	(0.1)
Income (Loss) from Continuing Operations Attributable to Parent, Available to Common Stockholders	$ (140.1)	$ (25.2)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1.7	1.4

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- Definition

Income (Loss) from Continuing Operations Attributable to Parent, Available to Common Stockholders

+ References

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
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Amount after tax of income (loss) from continuing operations attributable to the parent.

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Amount of preferred stock dividends and adjustments classified as other.

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