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Sale Leaseback (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sale Leaseback Transaction [Line Items]    
Deferred Gain on Sale of Property $ 0.3  
Other Accrued Liabilities, Noncurrent 11.8 $ 39.8
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax [1],[2] 34.8  
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 jackup rigs ENSCO 83, ENSCO 89, ENSCO 93 and ENSCO 98, all of which are contracted to Pemex. As described below, the loss on sale and operating results of ENSCO 93 were included in loss from discontinued operations, net, in our consolidated statement of operations for the three-year period ended December 31, 2015.
[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, 2015 and were previously included within the operating segment noted in the above table.