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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2015
Feb. 19, 2016
Jun. 30, 2015
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2015    
Entity Registrant Name Ensco plc    
Entity Central Index Key 0000314808    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 5,225,851,000
Entity Common Shares, Shares Outstanding   235,274,198