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Derivative Instruments (Schedule Of Derivatives At Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivative [Line Items]    
Total fair value of derivative assets $ 0.5us-gaap_DerivativeFairValueOfDerivativeAsset $ 0.7us-gaap_DerivativeFairValueOfDerivativeAsset
Total fair value of derivative liabilities 45.9us-gaap_DerivativeFairValueOfDerivativeLiability 27.0us-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		 0.5us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Total fair value of derivative liabilities 38.9us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 20.1us-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] 0.4us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [1]
Total fair value of derivative liabilities 35.3us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [1] 17.2us-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] 0.1us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsNoncurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [2]
Total fair value of derivative liabilities 3.6us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsNoncurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [2] 2.9us-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 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 0.2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Total fair value of derivative liabilities 7.0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 6.9us-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 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] 0.2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Total fair value of derivative liabilities $ 7.0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= esv_ForeignCurrencyForwardContractsCurrentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] $ 6.9us-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 twelve months from the respective balance sheet date were included in other current assets and accrued liabilities and other, respectively, on our condensed consolidated balance sheets.
[2] Derivative assets and liabilities that have maturity dates greater than twelve months from the respective balance sheet date were included in other assets, net, and other liabilities, respectively, on our condensed consolidated balance sheets.