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Discontinued Operations (Schedule of Rig Sales) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net cash provided by (used in) discontinued operations $ (0.8) $ 8.4 $ (8.7)
Net Book Value [1],[2] 7.9    
Pre-tax Gain/(Loss) [2] 2.7    
Disposal Group, Including Discontinued Operation, Gross Profit (Loss) [2] 10.6    
Floaters [Member] | ENSCO DS-2 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net cash provided by (used in) discontinued operations [2] 5.0    
Net Book Value [1],[2] 4.0    
Pre-tax Gain/(Loss) 1.0    
Floaters [Member] | ENSCO 6000 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net cash provided by (used in) discontinued operations [2] 0.6    
Net Book Value [1],[2] 0.8    
Pre-tax Gain/(Loss) (0.2)    
Floaters [Member] | ENSCO 5001 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net cash provided by (used in) discontinued operations [2]   2.4  
Net Book Value [1],[2]   2.5  
Pre-tax Gain/(Loss)   (0.1)  
Floaters [Member] | ENSCO 5002 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net cash provided by (used in) discontinued operations [2]   1.6  
Net Book Value [1],[2]   0.0  
Pre-tax Gain/(Loss)   $ 1.6  
Jackups [Member] | ENSCO 90 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net cash provided by (used in) discontinued operations [2] 0.3    
Net Book Value [1],[2] 0.3    
Pre-tax Gain/(Loss) 0.0    
Jackups [Member] | ENSCO 58 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net cash provided by (used in) discontinued operations [2] 0.7    
Net Book Value [1],[2] 0.3    
Pre-tax Gain/(Loss) $ 0.4    
[1] Includes the rig's net book value as well as inventory and other assets on the date of the sale.
[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, 2017 and were previously included within the specified operating segment.