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Income Taxes (Summary Of Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Balance, beginning of year	$ 151.7us-gaap_UnrecognizedTaxBenefits	$ 110.7us-gaap_UnrecognizedTaxBenefits
Increases in unrecognized tax benefits as a result of tax positions taken during prior years	16.3us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	35.8us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Increases in unrecognized tax benefits as a result of tax positions taken during the current year	5.5us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	10.0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Decreases in unrecognized tax benefits as a result of tax positions taken during prior years	(15.5)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	(3.7)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Settlements with taxing authorities	(14.2)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Lapse of applicable statutes of limitations	(0.7)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	(1.1)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Impact of foreign currency exchange rates	(8.7)esv_UnrecognizedTaxBenefitsForeignCurrencyTranslationGainLossArisingDuringPeriod	0esv_UnrecognizedTaxBenefitsForeignCurrencyTranslationGainLossArisingDuringPeriod
Balance, end of year	$ 134.4us-gaap_UnrecognizedTaxBenefits	$ 151.7us-gaap_UnrecognizedTaxBenefits

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Unrecognized tax benefits foreign currency translation gain (loss) arising during period.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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