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Property And Equipment (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
rigs
$ / bbl
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
rigs
$ / bbl
Sep. 30, 2014
USD ($)
$ / bbl
Jun. 30, 2014
USD ($)
rigs
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
rigs
$ / bbl
Dec. 31, 2014
USD ($)
rigs
$ / bbl
Dec. 31, 2013
USD ($)
Jan. 31, 2016
$ / bbl
Property, Plant and Equipment [Line Items]                        
Impairment of Long-Lived Assets Held-for-use $ 2,460,300       $ 517,300       $ 2,470,300 $ 1,220,800    
Cost of Services, Depreciation 149,700 $ 145,200 $ 140,500 $ 137,100 139,400 $ 135,200 $ 132,200 $ 131,100 572,500 537,900 $ 496,200  
Assets held for sale 5,500       152,400       5,500 152,400    
Property and equipment $ 12,719,400       $ 14,975,500       12,719,400 14,975,500    
Impairment of Long Lived Assets                 2,618,900 2,463,100    
Impairment of Long-Lived Assets to be Disposed of                 $ 148,600 $ 1,242,300    
Number of Rigs Committed to be Sold | rigs 6           5          
Price Per Barrel | $ / bbl 35       55 95     35 55    
Asset Impairment Charges $ 2,744,000 2,400 $ 0 $ 0 $ 3,515,200 $ 0 $ 703,500 $ 0 $ 2,746,400 $ 4,218,700 0  
Drilling rigs and equipment [Member]                        
Property, Plant and Equipment [Line Items]                        
Increase in drilling rigs and equipment                 (2,300,000)      
Property and equipment 11,001,800       13,253,200       11,001,800 13,253,200    
Work in progress [Member]                        
Property, Plant and Equipment [Line Items]                        
Property and equipment 1,537,600       1,587,300       1,537,600 1,587,300    
Work in progress [Member] | Jackup Rigs [Member]                        
Property, Plant and Equipment [Line Items]                        
Property and equipment 259,800       179,300       259,800 179,300    
Work in progress [Member] | Ultra Deepwater Drillships [Member]                        
Property, Plant and Equipment [Line Items]                        
Property and equipment 1,085,200       820,100       1,085,200 820,100    
Work in progress [Member] | Semisubmersible Rigs [Member]                        
Property, Plant and Equipment [Line Items]                        
Property and equipment         233,100         233,100    
Work in progress [Member] | Premium Jackup Rigs [Member]                        
Property, Plant and Equipment [Line Items]                        
Property and equipment 71,100       59,200       71,100 $ 59,200    
ENSCO DS-2 [Member]                        
Property, Plant and Equipment [Line Items]                        
Impairment of Long-Lived Assets to be Disposed of             (288,000)          
Discontinued Operations [Member]                        
Property, Plant and Equipment [Line Items]                        
Impairment of Long-Lived Assets to be Disposed of $ 115,800 $ 25,600     $ 407,900   546,400          
Floaters [Member]                        
Property, Plant and Equipment [Line Items]                        
Impairment of Long-Lived Assets Held-for-use             $ 991,500          
Impaired Long-Lived Assets Held and Used, Asset Description                   2    
Cost of Services, Depreciation                 $ 382,400 $ 358,100 342,200  
Number of Rigs Committed to be Sold | rigs                 3 6    
Asset Impairment Charges                 $ 1,778,400 $ 3,982,300    
Number Of Additional Rigs Committed To Be Sold | rigs         1              
Jackups [Member]                        
Property, Plant and Equipment [Line Items]                        
Impaired Long-Lived Assets Held and Used, Asset Description                   10    
Cost of Services, Depreciation                 $ 175,700 $ 171,200 $ 147,500  
Number of Rigs Committed to be Sold | rigs                 2 2    
Asset Impairment Charges                 $ 968,000 $ 236,400    
ensco 91 [Member] | Continuing Operations [Member]                        
Property, Plant and Equipment [Line Items]                        
Impairment of Long-Lived Assets to be Disposed of                 $ 10,000      
Scenario, Forecast [Member]                        
Property, Plant and Equipment [Line Items]                        
Price Per Barrel | $ / bbl                       26