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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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 6,130.8esv_DebtInstrumentCarryingValue	$ 5,920.4esv_DebtInstrumentCarryingValue
Estimated Fair Value	6,174.9us-gaap_DebtInstrumentFairValue	5,973.4us-gaap_DebtInstrumentFairValue
4.7% Senior notes due 2021 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	1,480.6esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesMember	1,479.9esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesMember
Estimated Fair Value	1,517.4us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointSevenZeroPercentSeniorNotesMember	1,505.3us-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	1,004.0esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember	1,008.2esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
Estimated Fair Value	1,025.1us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember	1,008.5us-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	145.4esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesMember	998.0esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesMember
Estimated Fair Value	149.1us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_ThreePointTwoFivePercentSeniorNotesMember	1,018.3us-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	624.2esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMember	624.2esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMember
Estimated Fair Value	604.6us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointFivePercentSeniorNotesMember	602.0us-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	1,003.6esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMemberDomain	622.3esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMemberDomain
Estimated Fair Value	998.0us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FivePointSevenFivePercentSeniorNotesMemberDomain	615.8us-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	697.4esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FivePointTwoPercentSeniorNotesMember	0esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FivePointTwoPercentSeniorNotesMember
Estimated Fair Value	702.8us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FivePointTwoPercentSeniorNotesMember	0us-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	579.5esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesMember	583.8esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesMember
Estimated Fair Value	596.9us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesMember	611.8us-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	380.8esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesMember	381.2esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesMember
Estimated Fair Value	351.4us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesMember	363.8us-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	149.2esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesMember	149.2esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesMember
Estimated Fair Value	160.7us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesMember	171.4us-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	39.1esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember	46.6esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember
Estimated Fair Value	39.2us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointThreeThreePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember	46.8us-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	27.0esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember	27.0esv_DebtInstrumentCarryingValue / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember
Estimated Fair Value	$ 29.7us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = esv_FourPointSixFivePercentMarineAdministrationBondsIncludingCurrentMaturitiesMember	$ 29.7us-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

X

- 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

X

- 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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X

- 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

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