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Acquisition Of Pride International, Inc. (Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended9 Months Ended9 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Mar. 31, 2011
Sep. 30, 2011
Minimum [Member]
years
Sep. 30, 2011
Maximum [Member]
years
Sep. 30, 2011
Common Stock [Member]
Sep. 30, 2011
ENSCO ADSs [Member]
Sep. 30, 2011
8.50% Senior Notes [Member]
Sep. 30, 2011
7.875% Senior Notes [Member]
Sep. 30, 2011
6.875% Senior Notes [Member]
Sep. 30, 2011
Maritime Administration Bond [Member]
May 31, 2011
Ensco Plc [Member]
Sep. 30, 2011
Pride International, Inc. [Member]
Business Acquisition [Line Items]             
Business acquisition date May 31, 2011           
Bond Due Date          2016  
Business acquisition, revenues from merger date$ 440,100,000$ 591,300,000           
Business acquisition, net income from merger date62,600,00086,900,000           
Business acquisition, shareholders rights to receive in cash, per share            $ 15.60
Business acquisition, share holders rights to receive in ratio of share      0.4778      
Business acquisition, total consideration delivered7,415,900,0007,415,900,000           
Cash consideration paid     2,803,000,000       
Business acquisition, equity interest issued or issuable, number of shares      85.8      
Share consideration paid4,577,500,0004,577,500,000           
Closing price of Ensco ADSs      $ 53.32    $ 53.32 
Estimated fair value of 2.5 million vested Pride employee stock options assumed by Ensco35,400,00035,400,000           
Number of drillships under construction two           
Equipment drillships seven           
Equipment semisubmersible rigs 12           
Equipment jackup rigs seven           
Estimated fair value of pride's drilling rigs adjustments285,500,000285,500,000           
Remaining estimated useful life of drilling rigs (in years)   1035        
Drilling rigs, estimated useful life, years, minimum 30           
Drilling rigs, estimated useful life, years, maximum 35           
Amortization expenses adjusted in intangible revenues 27,100,000           
Intangible assets included in other current assets and other assets186,200,000186,200,000           
Intangible liabilities included in other current liabilities and other liabilities226,100,000226,100,000           
Future amortization income (expense), year 2011 26,800,000           
Future amortization income (expense), year 2012 26,000,000           
Future amortization income (expense), year 2013 7,900,000           
Future amortization income (expense), year 2014 (4,800,000)           
Future amortization income (expense), year 2015 (15,600,000)           
Future amortization income (expense), Thereafter (400,000)           
Debt instrument interest rate stated percentage       8.50%7.875%6.875%   
Principal amount of outstanding debt       500,000,000300,000,000900,000,000151,500,000  
Aggregate intangible assets  209,000,000          
Aggregate intangible liabilities  276,000,000          
Senior notes due dates       201920402020   
Intangible liability of an unfavorable drillship construction contract 36,000,000           
Business combination debt assumed fair value adjustment          406,200,000  
Unsecured revolving credit facility total          181,000,000  
Payments for Merger-related costs23,800,000            
Debt issuance costs 27,200,000           
ADS issuance costs      70,500,000      
Recognized net deferred tax liability $ 24,200,000