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Discontinued Operations (Narrative) (Details) - Debt Instrument, Name [Domain]
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
rigs
Dec. 31, 2014
USD ($)
rigs
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
rigs
Jun. 30, 2014
USD ($)
May. 31, 2014
rigs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item       $ (13.3)    
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current $ 145.7 $ 152.4   $ 145.7    
Number Of Rigs Committed To Be Sold | rigs 6     6   5
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit $ 7.2   $ 796.8 $ 7.2 $ 796.8  
Debt Instrument Carrying Value 5,925.7 $ 5,920.4   $ 5,925.7    
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        
Jackup [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        
ENSCO 5002 [Member] [Member] | Floaters [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net proceeds from rig sale 1.6          
ENSCO5002 [Member] | Jackup [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 1.6          
ENSCO69andPrideWisconsin [Member] | Jackup [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net proceeds from rig sale         32.2  
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal         $ 23.6  
ENSCO 5000 [Member] | Floaters [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net proceeds from rig sale   $ 1.3        
ENSCO 85 [Member] | Jackup [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net proceeds from rig sale     64.4      
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal     $ 10.3