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Discontinued Operations (Schedule of Rig Sales) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net Book Value [1],[2] $ 134.3             $ 134.3      
Pre-tax Gain/(Loss) [2],[3]               34.8      
Disposal Group, Including Discontinued Operation, Gross Profit (Loss) [2]               169.1      
Net Cash Provided by (Used in) Discontinued Operations               (8.7) $ 103.4 $ 202.1  
Floaters [Member] | ENSCO 5001 [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net Book Value [1],[2] 2.5             $ 2.5      
Pre-tax Gain/(Loss) (0.1)                    
Net Cash Provided by (Used in) Discontinued Operations [2] 2.4                    
Floaters [Member] | ENSCO 5002 [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net Book Value [1],[2]   $ 0.0                  
Pre-tax Gain/(Loss)   1.6                  
Net Cash Provided by (Used in) Discontinued Operations [2] $ 1.6 $ 1.6                  
Floaters [Member] | ENSCO 5000 [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net Book Value [1],[2]     $ 0.5           0.5    
Pre-tax Gain/(Loss)     0.8                
Net Cash Provided by (Used in) Discontinued Operations [2]     1.3                
Jackups [Member] | ENSCO 93 [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net Book Value [1],[2]       $ 52.9              
Pre-tax Gain/(Loss)       (1.2)         1.2    
Net Cash Provided by (Used in) Discontinued Operations [2]       $ 51.7         51.7    
Jackups [Member] | ENSCO 69 And Wisconsin [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net Book Value [1],[2]     $ 8.6           $ 8.6    
Pre-tax Gain/(Loss)           $ 23.6          
Net Cash Provided by (Used in) Discontinued Operations [2]           $ 32.2          
Jackups [Member] | ENSCO 85 [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net Book Value [1],[2]                     $ 54.1
Pre-tax Gain/(Loss)         $ 10.3            
Net Cash Provided by (Used in) Discontinued Operations [2]         $ 64.4            
Jackups [Member] | Pride Pennsylvania Rig [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net Book Value [1],[2]             $ 15.7        
Pre-tax Gain/(Loss)             (0.2)        
Net Cash Provided by (Used in) Discontinued Operations [2]             $ 15.5        
[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, 2015 and were previously included within the operating segment noted in the above table.
[3] 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.