v2.4.0.6
Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2011
Earnings Per Share [Abstract]  
Reconciliation Of Net Income Attributable To Ensco Shares
 
  2011   
  
    2010   
           
Net income attributable to Ensco
$64.6
    
$189.8
  
Net income allocated to non-vested share awards
(1.0
)
  
(2.4
)
Net income attributable to Ensco shares
$63.6
  
      
$187.4
  
Reconciliation Of Weighted-Average Shares Used In Earnings Per Share Computations
 
  2011   
  2010    
         
Weighted-average shares - basic
141.2
  
140.7 
  
Potentially dilutive share options
.2
  
.1 
  
Weighted-average shares - diluted
141.4
  
140.8