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STOCK-BASED COMPENSATION (Details 2) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Stock options
   
Stock-based compensation    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 25.48 $ 15.51
Total intrinsic value of options exercised $ 107.4 $ 2.5
Cash received from option exercises 2.7 4.2
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options 0.5 0.2
Total unrecognized compensation expense related to nonvested shares granted to both employees and non-employees 38.5  
Cost expected to be recognized over a weighted-average period (in years) 2.4  
Stock units and stock awards expected to vest (in shares) 16,060  
Restricted stock units
   
Stock-based compensation    
Total unrecognized compensation expense related to nonvested shares granted to both employees and non-employees $ 29.0  
Cost expected to be recognized over a weighted-average period (in years) 2.1  
Stock units and stock awards expected to vest (in shares) 700  
Number of Shares    
Non-vested at the beginning of the period (in shares) 724  
Granted (in shares) 91  
Non-vested at the end of the period (in shares) 815  
Weighted-Average Fair Value    
Non-vested at the beginning of the period (in dollars per share) $ 41.66  
Granted (in dollars per share) $ 57.45  
Non-vested at the end of the period (in dollars per share) $ 43.44