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Discontinued Operations (Narrative) (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
rigs
Dec. 31, 2014
USD ($)
rigs
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
rigs
Sep. 30, 2014
USD ($)
Jun. 30, 2015
rigs
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       $ (11.9)      
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current $ 127.5 $ 152.4   $ 127.5      
Number Of Rigs Committed To Be Sold | rigs 7     7   6 5
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit $ 17.3   $ 0.0 $ 24.5 $ 796.8    
Debt Instrument Carrying Value $ 5,903.3 $ 5,920.4   5,903.3      
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          
ENSCO5002 [Member] | Floaters [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax       (1.6)      
Net proceeds from rig sale       $ 1.6      
ENSCO69andPrideWisconsin [Member] | Jackup [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax         (23.6)    
Net proceeds from rig sale         32.2    
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]              
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax         (10.3)    
Net proceeds from rig sale         64.4    
Ensco 93 [Member] | Jackup [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax         $ 1.2    
Net proceeds from rig sale   $ 51.7