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Discontinued Operations (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
rigs
Jun. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
rigs
Mar. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
rigs
Dec. 31, 2014
USD ($)
rigs
Dec. 31, 2013
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item             $ 12.6    
Number of Rigs Committed to be Sold | rigs 6     5          
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit             120.6 $ 1,158.8 $ 0.0
Pre-tax Gain/(Loss) [1],[2]             34.8    
Net Cash Provided by (Used in) Discontinued Operations             $ (8.7) $ 103.4 $ 202.1
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 2  
Jackups [Member] | ENSCO 69 And Wisconsin [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Pre-tax Gain/(Loss)         $ 23.6        
Net Cash Provided by (Used in) Discontinued Operations [2]         $ 32.2        
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)         $ 1.2  
Net Cash Provided by (Used in) Discontinued Operations [2]     $ 51.7         $ 51.7  
Jackups [Member] | ENSCO 85 [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
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]                  
Pre-tax Gain/(Loss)           $ (0.2)      
Net Cash Provided by (Used in) Discontinued Operations [2]           $ 15.5      
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             3 6  
Floaters [Member] | ENSCO 5002 [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Pre-tax Gain/(Loss)   $ 1.6              
Net Cash Provided by (Used in) Discontinued Operations [2] $ 1.6 $ 1.6              
Floaters [Member] | ENSCO 5001 [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Pre-tax Gain/(Loss) (0.1)                
Net Cash Provided by (Used in) Discontinued Operations [2] $ 2.4                
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, Tax Benefit             $ 28.0 $ 83.5  
[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.