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Sale Leaseback (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sale Leaseback Transaction [Line Items]      
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax [1],[2] $ 36.2    
ENSCO 83, 89, 93 and 98 [Member]      
Sale Leaseback Transaction [Line Items]      
Proceeds from Sale of Other Property, Plant, and Equipment   $ 211.8  
Sales Commissions and Fees   5.3  
Sale Leaseback Transaction, Net Book Value   169.6  
Gain (Loss) on Disposition of Property Plant Equipment     $ 7.5
Sale Leaseback Transaction, Deferred Gain, Net     29.4
Deferred Gain on Sale of Property   $ 22.4 $ 7.0
[1] In September 2014, we sold ENSCO 93, a jackup contracted to Pemex. In connection with this sale, we executed a charter agreement with the purchaser to continue operating the rig for the remainder of the Pemex contract, which ended in July 2015, less than one year from the date of sale. Our management services following the sale did not constitute significant ongoing involvement and therefore, the $1.2 million loss on sale was included in loss from discontinued operations, net, in our consolidated statement of operations for the year ended December 31, 2014.
[2] The rigs' operating results were reclassified to discontinued operations in our consolidated statements of operations for each of the years in the three-year period ended December 31, 2016 and were previously included within the specified operating segment.