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Acquisition Of Pride International, Inc. (Schedule Of Goodwill Recognized) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Business Acquisition [Line Items]    
Total $ 3,263.0 $ 3,263.0
Pride International, Inc. [Member]
   
Business Acquisition [Line Items]    
Total 2,926.8  
Deepwater [Member] | Pride International, Inc. [Member]
   
Business Acquisition [Line Items]    
Total 2,458.3  
Midwater [Member] | Pride International, Inc. [Member]
   
Business Acquisition [Line Items]    
Total 468.5  
Jackup [Member] | Pride International, Inc. [Member]
   
Business Acquisition [Line Items]    
Total $ 0