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Document And Entity Information (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Feb. 24, 2015
Jun. 30, 2014
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2014    
Entity Registrant Name Ensco plc    
Entity Central Index Key 0000314808    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2014    
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     $ 11,554,518dei_EntityPublicFloat
Entity Common Shares, Shares Outstanding   234,172,524dei_EntityCommonStockSharesOutstanding