v2.4.0.6
Share-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2011
Share-Based Compensation [Abstract]  
Summary Of The Value Of Share Options Granted
Weighted-average grant-date fair value
 
$19.31
Weighted-average exercise price
 
$55.34
Weighted-Average Assumptions
Risk-free interest rate
  1.7 %
Expected life (in years)
  3.93  
Expected volatility
  52.2
Dividend yield
  2.5