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Derivative Instruments (Schedule Of Derivatives At Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Total fair value of derivative assets $ 0.7us-gaap_DerivativeFairValueOfDerivativeAsset $ 12.8us-gaap_DerivativeFairValueOfDerivativeAsset
Total fair value of derivative liabilities 27.0us-gaap_DerivativeFairValueOfDerivativeLiability 11.0us-gaap_DerivativeFairValueOfDerivativeLiability
Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Total fair value of derivative assets 0.5us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 10.3us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Total fair value of derivative liabilities 20.1us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 10.4us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts - Current [Member]    
Derivative [Line Items]    
Total fair value of derivative assets 0.4us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [1] 9.1us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [1]
Total fair value of derivative liabilities 17.2us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [1] 9.8us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [1]
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts - Non-Current [Member]    
Derivative [Line Items]    
Total fair value of derivative assets 0.1us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsNoncurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [2] 1.2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsNoncurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [2]
Total fair value of derivative liabilities 2.9us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsNoncurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [2] 0.6us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsNoncurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [2]
Not Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Total fair value of derivative assets 0.2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 2.5us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Total fair value of derivative liabilities 6.9us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 0.6us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts - Current [Member]    
Derivative [Line Items]    
Total fair value of derivative assets 0.2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] 2.5us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Total fair value of derivative liabilities $ 6.9us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] $ 0.6us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
[1] Derivative assets and liabilities that have maturity dates equal to or less than 12 months from the respective balance sheet dates were included in other current assets and accrued liabilities and other, respectively, on our consolidated balance sheets.
[2] Derivative assets and liabilities that have maturity dates greater than 12 months from the respective balance sheet dates were included in other assets, net, and other liabilities, respectively, on our consolidated balance sheets.