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Discontinued Operations (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
rigs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit   $ 120.6 $ 1,158.8
Pre-tax Gain/(Loss) [1],[2] $ (36.2)    
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item 10.2 12.6  
Jackups [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of Rigs Committed to be Sold | rigs     2
Jackups [Member] | ENSCO 93 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Pre-tax Gain/(Loss)     $ 1.2
Floaters [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of Rigs Committed to be Sold | rigs     6
Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit $ 0.0    
Impairment of Long-Lived Assets to be Disposed of, Tax Benefit   $ 28.0 $ 83.5
[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.