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Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Fair Value, Net | $ (45.4)us-gaap_DerivativeFairValueOfDerivativeNet |  | $ (26.3)us-gaap_DerivativeFairValueOfDerivativeNet
Maturity period of derivatives (in months) | 18 months |  |
Estimated amount of net gains associated with derivative instruments, net of tax | (19.5)us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred |  |
Foreign Exchange [Member] | Cash Flow Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 374.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Hedges outstanding for British pounds | 174.2 esv_BritishPoundsHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Hedges outstanding for Brazilian reals | 105.0 esv_BrazilianRealsHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Hedges outstanding for Australian dollars | 22.7 esv_AustralianDollarsHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Hedges outstanding for euros | 27.4 esv_EurosHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Singapore Dollars Hedges Outstanding | 23.8 esv_SingaporeDollarsHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Hedges outstanding for other currencies | 21.6 esv_OtherCurrenciesHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (13.5)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (0.6)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Not Designated as Hedging Instrument [Member] | Foreign Exchange [Member] | Fair Value Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 170.5 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Hedges outstanding for British pounds | 26.1 esv_BritishPoundsHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Hedges outstanding for Indonesian rupiah | 13.8 esv_IndonesianRupiahHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Mexican Pesos Hedges Outstanding | 10.7 esv_MexicanPesosHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Hedges outstanding for euros | 82.7 esv_EurosHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Hedges outstanding for Swiss francs | 14.2 esv_SwissFrancsHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |
Hedges outstanding for other currencies | $ 23.0 esv_OtherCurrenciesHedgesOutstanding / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeMember |  |

X
- Definition Australian dollars hedges outstanding + References No definition available. + Details
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- Definition Brazilian Reals Hedges Outstanding + References No definition available. + Details
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Namespace Prefix: | esv_
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Balance Type: | debit
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- Definition British pounds hedges outstanding + References No definition available. + Details
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Balance Type: | debit
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- Definition Euros Hedges Outstanding + References No definition available. + Details
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- Definition Indonesian Rupiah Hedges Outstanding + References No definition available. + Details
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- Definition Mexican Pesos Hedges Outstanding + References No definition available. + Details
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Namespace Prefix: | esv_
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- Definition Other currencies hedges outstanding + References No definition available. + Details
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Namespace Prefix: | esv_
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Balance Type: | debit
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- Definition Singapore dollars hedges outstanding + References No definition available. + Details
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Namespace Prefix: | esv_
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- Definition Swiss Francs Hedges Outstanding + References No definition available. + Details
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Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Details
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_ForeignExchangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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