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Debt (Schedule Of Long-Term Debt Instruments) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |
Total | 5,920.4 us-gaap_DebtAndCapitalLeaseObligations | $ 4,766.4 us-gaap_DebtAndCapitalLeaseObligations
Less current maturities | (34.8)us-gaap_DebtCurrent | (47.5)us-gaap_DebtCurrent
Total long-term debt | 5,885.6 us-gaap_LongTermDebtNoncurrent | 4,718.9 us-gaap_LongTermDebtNoncurrent
4.70% Senior notes due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 4.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesDueTwoThousandTwentyOneMember |
Debt instrument maturity period | 2021 |
6.875% Senior notes due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember |
Debt instrument maturity period | 2020 |
3.25% Senior notes due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesDueTwoThousandSixteenMember |
Debt instrument maturity period | 2016 |
Four Point Five Percent Senior Notes Member [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMemberMember |
Debt instrument maturity period | 2024 |
Five Point Seven Five Percent Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMember |
Debt instrument maturity period | 2044 |
8.50% Senior notes due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesDueTwoThousandNineteenMember |
Debt instrument maturity period | 2019 |
7.875% Senior notes due 2040 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesDueTwoThousandFortyMember |
Debt instrument maturity period | 2040 |
7.20% Debentures due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 7.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesDueTwoThousandTwentySevenMember |
Debt instrument maturity period | 2027 |
4.33% MARAD bonds due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 4.33%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentNotesDueTwoThousandSixteenMember |
Debt instrument maturity period | 2016 |
6.36% MARAD bonds due 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 6.36%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SixPointThreeSixPercentBondsDueTwoThousandFifteenMember |
Debt instrument maturity period | 2015 |
4.65% MARAD bonds due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentBondsDueTwoThousandTwentyMember |
Debt instrument maturity period | 2020 |
Reported Value Measurement [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 5,920.4 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 4,766.4 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | 4.70% Senior notes due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 1,479.9 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesDueTwoThousandTwentyOneMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,477.2 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesDueTwoThousandTwentyOneMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | 6.875% Senior notes due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 1,008.2 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,024.8 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | 3.25% Senior notes due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 998.0 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesDueTwoThousandSixteenMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 996.5 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesDueTwoThousandSixteenMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | Four Point Five Percent Senior Notes Member [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 624.2 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMemberMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 0 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMemberMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | Five Point Seven Five Percent Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 622.3 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 0 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | 8.50% Senior notes due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 583.8 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesDueTwoThousandNineteenMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 600.5 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesDueTwoThousandNineteenMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | 7.875% Senior notes due 2040 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 381.2 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesDueTwoThousandFortyMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 382.6 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesDueTwoThousandFortyMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | 7.20% Debentures due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 149.2 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesDueTwoThousandTwentySevenMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 149.1 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesDueTwoThousandTwentySevenMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | 4.33% MARAD bonds due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 46.6 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentNotesDueTwoThousandSixteenMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 78.9 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentNotesDueTwoThousandSixteenMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | 6.36% MARAD bonds due 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 0 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SixPointThreeSixPercentBondsDueTwoThousandFifteenMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 25.3 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SixPointThreeSixPercentBondsDueTwoThousandFifteenMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | 4.65% MARAD bonds due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 27.0 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentBondsDueTwoThousandTwentyMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | $ 31.5 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentBondsDueTwoThousandTwentyMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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