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Sale Leaseback (Details) (ENSCO 83, ENSCO 89, ENSCO 98 [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Sep. 30, 2014
ENSCO 83, ENSCO 89, ENSCO 98 [Member] |  |
Sale Leaseback Transaction [Line Items] |  |
Gain (Loss) on Sale of Properties |  | $ 7.5 us-gaap_GainLossOnSaleOfProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO83ENSCO89ENSCO98Member
Sale Leaseback Transaction, Deferred Gain, Gross | 29.4 us-gaap_SaleLeasebackTransactionDeferredGainGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO83ENSCO89ENSCO98Member |
Sale Leaseback Transaction, Current Period Gain Recognized | 7.1 us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO83ENSCO89ENSCO98Member |
Sale Leaseback Transaction, Deferred Gain, Net | $ 15.3 us-gaap_SaleLeasebackTransactionDeferredGainNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO83ENSCO89ENSCO98Member |

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The portion of the deferred gain that was recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35688829&loc=d3e50609-112754 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of the gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller to be recognized in future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6456126&loc=d3e49567-112750 + Details
Name: | us-gaap_SaleLeasebackTransactionDeferredGainGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The portion of the gain that will be recorded as income or a reduction in rent expense in future periods less amounts recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35688829&loc=d3e50609-112754 + Details
Name: | us-gaap_SaleLeasebackTransactionDeferredGainNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_SaleLeasebackTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration