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Segment Information (Schedule Of Revenues And Long-Lived Assets By Geographical Segment) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,159.8 us-gaap_RevenueOilAndGasServices | $ 1,201.4 us-gaap_RevenueOilAndGasServices | $ 1,136.6 us-gaap_RevenueOilAndGasServices | $ 1,066.7 us-gaap_RevenueOilAndGasServices | $ 1,138.0 us-gaap_RevenueOilAndGasServices | $ 1,119.9 us-gaap_RevenueOilAndGasServices | $ 1,076.1 us-gaap_RevenueOilAndGasServices | $ 989.4 us-gaap_RevenueOilAndGasServices | $ 4,564.5 us-gaap_RevenueOilAndGasServices | $ 4,323.4 us-gaap_RevenueOilAndGasServices | $ 3,638.8 us-gaap_RevenueOilAndGasServices
Long-lived Assets | 12,534.8 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 14,311.0 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 12,534.8 us-gaap_PropertyPlantAndEquipmentNet | 14,311.0 us-gaap_PropertyPlantAndEquipmentNet | 13,145.6 us-gaap_PropertyPlantAndEquipmentNet
Geographic Areas [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,564.5 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember | 4,323.4 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember | 3,638.8 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember
Long-lived Assets | 12,534.8 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember |  |  |  | 14,311.0 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember |  |  |  | 12,534.8 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember | 14,311.0 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember | 13,145.6 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember
Geographic Areas [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,712.4 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_US | 1,687.2 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_US | 1,265.5 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_US
Long-lived Assets | 5,240.4 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 4,617.8 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 5,240.4 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_US | 4,617.8 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_US | 4,525.9 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_US
Geographic Areas [Member] | Brazil [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 459.1 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_BR | 683.7 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_BR | 776.3 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_BR
Long-lived Assets | 1,459.0 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_BR |  |  |  | 2,447.5 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_BR |  |  |  | 1,459.0 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_BR | 2,447.5 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_BR | 2,911.3 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_BR
Geographic Areas [Member] | Angola [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 607.9 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_AO | 365.9 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_AO | 190.0 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_AO
Long-lived Assets | 1,913.5 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_AO |  |  |  | 2,543.7 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_AO |  |  |  | 1,913.5 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_AO | 2,543.7 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_AO | 2,147.2 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = country_AO
Geographic Areas [Member] | Other countries [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,785.1 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = esv_OtherCountriesMember | 1,586.6 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = esv_OtherCountriesMember | 1,407.0 us-gaap_RevenueOilAndGasServices / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = esv_OtherCountriesMember
Long-lived Assets | $ 3,921.9 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = esv_OtherCountriesMember |  |  |  | $ 4,702.0 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = esv_OtherCountriesMember |  |  |  | $ 3,921.9 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = esv_OtherCountriesMember | $ 4,702.0 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = esv_OtherCountriesMember | $ 3,561.2 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = esv_GeographicAreasMember / us-gaap_StatementGeographicalAxis = esv_OtherCountriesMember

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition Revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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