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Benefit Plans (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Long-Term Incentive Plan (LTIP) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for issuance as awards | 14,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = esv_LongTermIncentivePlanMember |  |
Non-Vested Share Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost on awards | $ 100,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = esv_NonVestedShareAwardsMember |  |
Recognized compensation cost, weighted-average period, years | 2 years 1 month 6 days |  |
Non-Vested Share Awards [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share awards, vest rate | 33.00%esv_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServiceIncrement / us-gaap_PlanNameAxis = esv_NonVestedShareAwardsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Non-Vested Share Awards [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share awards, vest rate | 20.00%esv_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServiceIncrement / us-gaap_PlanNameAxis = esv_NonVestedShareAwardsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Share Options Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for issuance as awards | 7,700,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = esv_ShareOptionsAwardMember |  |
Unrecognized compensation cost on awards | 0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = esv_ShareOptionsAwardMember |  |
Share options award, outstanding | 472,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = esv_ShareOptionsAwardMember |  |
Exercisable In Increments Over Four-Year Period [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share awards, vest rate | 25.00%esv_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServiceIncrement / us-gaap_PlanNameAxis = esv_ExercisableInIncrementsOverFourYearPeriodMember |  |
Exercisable In Increments Over Three-Year Period [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share awards, vest rate | 33.00%esv_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServiceIncrement / us-gaap_PlanNameAxis = esv_ExercisableInIncrementsOverThreeYearPeriodMember |  |
Performance Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost on awards | 5,000,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = esv_PerformanceAwardsMember |  |
Recognized compensation cost, weighted-average period, years | 1 year 10 months 24 days |  |
Share option awards, exercisable, increment | 3 years |  |
Performance awards, granted, aggregate grant-date fair value | 7,400,000 esv_PerformanceAwardsGrantedAggregateGrantDateFairValue / us-gaap_PlanNameAxis = esv_PerformanceAwardsMember | 8,200,000 esv_PerformanceAwardsGrantedAggregateGrantDateFairValue / us-gaap_PlanNameAxis = esv_PerformanceAwardsMember | 7,200,000 esv_PerformanceAwardsGrantedAggregateGrantDateFairValue / us-gaap_PlanNameAxis = esv_PerformanceAwardsMember
Performance awards, vested, aggregate fair value | 6,900,000 esv_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAggregateFairValue / us-gaap_PlanNameAxis = esv_PerformanceAwardsMember | 7,400,000 esv_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAggregateFairValue / us-gaap_PlanNameAxis = esv_PerformanceAwardsMember | 5,300,000 esv_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAggregateFairValue / us-gaap_PlanNameAxis = esv_PerformanceAwardsMember
Recognized compensation expense | 3,400,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = esv_PerformanceAwardsMember | 6,600,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = esv_PerformanceAwardsMember | 9,700,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = esv_PerformanceAwardsMember
Savings Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for issuance as awards | 1,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = esv_SavingsPlanMember |  |
Share awards, vest rate | 33.00%esv_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServiceIncrement / us-gaap_PlanNameAxis = esv_SavingsPlanMember |  |
Share option awards, exercisable, increment | 3 years |  |
Employee match | 100.00%esv_DefinedContributionPlansEmployeeContributionPercentageMatchedByEmployer / us-gaap_PlanNameAxis = esv_SavingsPlanMember |  |
Total matching contributions | 20,700,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_PlanNameAxis = esv_SavingsPlanMember | 21,100,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_PlanNameAxis = esv_SavingsPlanMember | 16,500,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_PlanNameAxis = esv_SavingsPlanMember
Profit sharing contribution provisions | $ 30,700,000 esv_ProfitSharingContributionProvisions / us-gaap_PlanNameAxis = esv_SavingsPlanMember | $ 55,300,000 esv_ProfitSharingContributionProvisions / us-gaap_PlanNameAxis = esv_SavingsPlanMember | $ 45,100,000 esv_ProfitSharingContributionProvisions / us-gaap_PlanNameAxis = esv_SavingsPlanMember
Savings Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum percentage of eligible employee compensation to be matched by employer | 5.00%esv_DefinedContributionPlansEmployeeContributionPercentageOfEligibleCompensationMatchedByEmployer / us-gaap_PlanNameAxis = esv_SavingsPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate number of common shares reserved for future issuance. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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