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STOCK-BASED COMPENSATION (Details 2) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stock-Based Compensation arrangements        
Stock based compensation expense $ 10.4 $ 10.0 $ 23.4 $ 29.3
Supplemental Employee Incentive Plan
       
Stock-Based Compensation arrangements        
Number of trading days during which the closing price per share of the Company's common stock equals or exceeds the goal price     20 days  
Number of consecutive trading days     60 days  
Stock based compensation expense $ 1.6   $ (0.1)  
Supplemental Employee Incentive Plan | Interim trigger date occurs by June 30, 2014
       
Stock-Based Compensation arrangements        
Minimum goal price for interim payout (in dollars per share) $ 50   $ 50  
Percentage of eligible employee's base salary, on or before specified date for interim distribution 20.00%      
Percentage of the interim distribution paid immediately 25.00%      
Percentage of the final distribution paid on deferred payment dates 75.00%      
Supplemental Employee Incentive Plan | Final trigger date occurs by June 30, 2016
       
Stock-Based Compensation arrangements        
Final goal price (in dollars per share) $ 75   $ 75  
Percentage of salary eligible for final distribution 50.00%      
Percentage of salary eligible for final distribution if the Company paid interim distributions upon achievement of the interim trigger 30.00%