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