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Property And Equipment (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2011 | Dec. 31, 2010
Property, Plant and Equipment [Line Items] |  |
Property and equipment | $ 14,234.0 | $ 6,744.6
Equipment Semisubmersible Rigs | 12 |
Equipment Drillships | seven |
Equipment Jackup Rigs | seven |
Drilling Rigs And Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 12,572.2 | 5,175.2
Property, Plant and Equipment, Gross, Period Increase (Decrease) | 7,400.0 |
Drilling Rigs And Equipment [Member] | Pride [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 5,500.0 |
Drilling Rigs And Equipment [Member] | ENSCO 8500 [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 1,400.0 |
Other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 89.6 | 50.4
Work In Progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 1,572.2 | 1,519.0
Property, Plant and Equipment, Gross, Period Increase (Decrease) | 53.2 |
Work In Progress [Member] | Pride [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 1,300.0 |
Work In Progress [Member] | ENSCO 8500 [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment |  | 783.1
Ensco Plc [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 1.8 | 1.8
Pride [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Equipment Semisubmersible Rigs | 12 |
Equipment Drillships | five |
Equipment Jackup Rigs | seven |
Ensco Ds-5/6/7 Ultra-Deepwater Semisubmersible Rigs [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 455.5 |
Jackup Rigs [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | $ 91.5 |

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- Definition Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: 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 + Details
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- Definition Property, plant and equipment additions minus disposals plus or minus transfers and other changes equals the increase or decrease in property, plant and equipment for the period. + Details
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