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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | $ 6,130.8 esv_DebtInstrumentCarryingValue | $ 5,920.4 esv_DebtInstrumentCarryingValue
Estimated Fair Value | 6,174.9 us-gaap_DebtInstrumentFairValue | 5,973.4 us-gaap_DebtInstrumentFairValue
4.7% Senior notes due 2021 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 1,480.6 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesMember | 1,479.9 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesMember
Estimated Fair Value | 1,517.4 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesMember | 1,505.3 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesMember
Debt instrument, interest rate, stated percentage | 4.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesMember | 4.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesMember
6.875% Senior notes due 2020 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 1,004.0 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember | 1,008.2 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
Estimated Fair Value | 1,025.1 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember | 1,008.5 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
Debt instrument, interest rate, stated percentage | 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember | 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
Three Point Two Five Percent Senior Notes Member |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 145.4 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesMember | 998.0 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesMember
Estimated Fair Value | 149.1 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesMember | 1,018.3 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesMember
Debt instrument, interest rate, stated percentage | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesMember | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesMember
Four Point Five Percent Senior Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 624.2 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMember | 624.2 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMember
Estimated Fair Value | 604.6 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMember | 602.0 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMember
Debt instrument, interest rate, stated percentage | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMember | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMember
Five Point Seven Five Percent Senior Notes Member [Domain] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 1,003.6 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMemberDomain | 622.3 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMemberDomain
Estimated Fair Value | 998.0 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMemberDomain | 615.8 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMemberDomain
Debt instrument, interest rate, stated percentage | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMemberDomain | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMemberDomain
Five Point Two Percent Senior Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 697.4 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FivePointTwoPercentSeniorNotesMember | 0 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FivePointTwoPercentSeniorNotesMember
Estimated Fair Value | 702.8 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FivePointTwoPercentSeniorNotesMember | 0 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FivePointTwoPercentSeniorNotesMember
Debt instrument, interest rate, stated percentage | 5.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FivePointTwoPercentSeniorNotesMember | 5.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FivePointTwoPercentSeniorNotesMember
8.5% Senior notes due 2019 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 579.5 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesMember | 583.8 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesMember
Estimated Fair Value | 596.9 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesMember | 611.8 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesMember
Debt instrument, interest rate, stated percentage | 8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesMember | 8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesMember
7.875% Senior notes due 2040 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 380.8 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesMember | 381.2 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesMember
Estimated Fair Value | 351.4 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesMember | 363.8 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesMember
Debt instrument, interest rate, stated percentage | 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesMember | 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesMember
7.2% Debentures due 2027 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 149.2 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesMember | 149.2 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesMember
Estimated Fair Value | 160.7 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesMember | 171.4 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesMember
Debt instrument, interest rate, stated percentage | 7.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesMember | 7.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesMember
Four Point Three Three Percent Marine Administration Bonds Including Current Maturities Member |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 39.1 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember | 46.6 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember
Estimated Fair Value | 39.2 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember | 46.8 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember
Debt instrument, interest rate, stated percentage | 4.33%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember | 4.33%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember
Four Point Six Five Percent Marine Administration Bonds Including Current Maturities Member |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 27.0 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember | 27.0 esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember
Estimated Fair Value | $ 29.7 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember | $ 29.7 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember
Debt instrument, interest rate, stated percentage | 4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember | 4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember

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- Definition Debt Instrument Carrying Value + References No definition available. + Details
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Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + 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 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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