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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, 2014
Mar. 31, 2013
Stock options
    
Stock-based compensation    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 29.86 $ 20.52
Total intrinsic value of options exercised $ 11.4 $ 3.3
Cash received from option exercises 5.7 2.4
Total unrecognized compensation expense related to non-vested shares granted to employees 56.2  
Cost expected to be recognized over a weighted-average period 2 years 9 months 18 days  
Stock units and stock awards expected to vest (in shares) 12,905  
Restricted stock units
    
Stock-based compensation    
Total unrecognized compensation expense related to non-vested shares granted to employees $ 10.9  
Cost expected to be recognized over a weighted-average period 1 year 10 months 24 days  
Stock units and stock awards expected to vest (in shares) 300  
Number of Shares    
Non-vested at the beginning of the period (in shares) 391  
Granted (in shares) 0  
Vested (in shares) (17)  
Forfeited/cancelled (in shares) (6)  
Non-vested at the end of the period (in shares) 368  
Weighted Average Grant-Date Fair Value    
Non-vested at the beginning of the period (in dollars per share) $ 49.27  
Granted (in dollars per share)   $ 50.89
Vested (in dollars per share) $ 57.18  
Forfeited/cancelled (in dollars per share) $ 57.30  
Non-vested at the end of the period (in dollars per share) $ 48.78