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Income Taxes (Summary Of Effective Income Tax Rate On Continuing Operations) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.K. statutory income tax rate	21.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	23.30%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	24.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Goodwill impairment	(25.30%)esv_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseGoodwillImpairmentLossesPercent	0.00%esv_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseGoodwillImpairmentLossesPercent	0.00%esv_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseGoodwillImpairmentLossesPercent
Assets impairment	(10.90%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses
Non-U.K. taxes	9.60%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(13.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(17.50%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Redomestication related income taxes	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	3.90%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Valuation allowance	(1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	1.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	5.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other	0.70%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	1.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	1.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate	(5.50%)us-gaap_EffectiveIncomeTaxRateContinuingOperations	12.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations	17.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition

Effective Income Tax Rate Reconciliation, Nondeductible Expense, Goodwill Impairment Losses, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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