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Acquisition Of Pride International, Inc. (Tables)
9 Months Ended
Sep. 30, 2011
Acquisition Of Pride International, Inc. [Abstract] 
Schedule Of Business Acquisitions, Components Of The Merger Consideration
Share consideration paid:
     
179.7 million outstanding shares of Pride common stock converted to 85.8 million of Ensco ADSs
   using the exchange ratio of 0.4778 and valued at $53.32 per share
 
$4,577.5
 
       
Cash and other consideration paid:
     
179.7 million outstanding shares of Pride common stock at $15.60 per share
 
2,803.0
 
Estimated fair value of 2.5 million vested Pride employee stock options assumed by Ensco
 
35.4
 
Merger consideration
 
$7,415.9
 
Schedule Of Business Acquisition, Provisional Amounts Recorded For Assets Acquired And Liabilities Assumed
Schedule Of Goodwill Recognized
Deepwater
       
$2,486.1
Midwater
       
473.8
Jackup
       
--
Total
       
$2,959.9
Business Acquisition, Pro Forma Information