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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income Tax Expense (Benefit), Discrete Item	$ 2.2	$ 2.0	$ 9.8	$ 5.4

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- Definition

Income Tax Expense (Benefit), Discrete Item

+ References

No definition available.

+ Details

Name:	esv_IncomeTaxExpenseBenefitDiscreteItem
Namespace Prefix:	esv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration