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Sale Leaseback (Notes)	3 Months Ended
Sale Leaseback (Notes)	Mar. 31, 2015
Leases [Abstract]
Sale Leaseback Transaction Disclosure [Text Block]	Note 10 -Sale-leaseback In September 2014, we sold jackup rigs ENSCO 83, ENSCO 89, ENSCO 93 and ENSCO 98, all of which are contracted to Petroleos Mexicanos (“Pemex”). In connection with this sale, we executed charter agreements with the purchaser to continue operating the rigs for the remainder of the Pemex contracts, which have anticipated completion dates in either late 2015 or 2016. We accounted for the transaction as a sale-leaseback, whereby we retain a significant portion of the remaining use of the rigs as a result of the charter agreements. We recorded an aggregate gain on sale of $7.5 million at the time of disposal, which represented the portion of the gain that exceeded the present value of payments due under the charter agreements. The remaining $29.4 million gain was deferred and amortized to contract drilling expense within the Jackup segment over the remaining charter term of each rig. Of the $29.4 million deferred gain, $7.1 million was recognized in contract drilling expense in our condensed consolidated statement of income for the quarter ended March 31, 2015 and $15.3 million was included in accrued liabilities and other on our condensed consolidated balance sheet as of March 31, 2015. Due to our charter agreements with the purchaser, ENSCO 83, ENSCO 89 and ENSCO 98 operating results for periods beginning after the date of sale (September 30, 2014) were included in income from continuing operations within the Other segment. Operating results for these rigs prior to September 30, 2014 were included in income from continuing operations within the Jackup segment. We expect that the ENSCO 93 charter agreement will end prior to September 30, 2015. As a result, ENSCO 93 operating results were included in loss from discontinued operations, net in our condensed consolidated statements of income for the quarters ended March 31, 2015 and 2014. See "Note 7 - Discontinued Operations" for additional information.