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STOCK-BASED COMPENSATION (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Restricted Stock Units
Mar. 31, 2013
Performance Share Awards
item
Mar. 31, 2013
Performance Share Awards
Greater than
Mar. 31, 2013
Performance Share Awards
Less than or equal to
Mar. 31, 2013
Performance shares based on performance conditions
Mar. 31, 2013
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
Mar. 31, 2013
Performance Share Awards Based on Internal Metrics-Three Performance Metrics
item
Feb. 28, 2013
Performance shares based on market conditions
Mar. 31, 2013
Performance shares based on market conditions
item
Stock-Based Compensation arrangements                      
Stock based compensation expense $ 18.7 $ 1.7                  
Granted (in shares)       402,250     274,760 84,990 189,770   127,490
Granted and fully vested (in shares)     22,560                
Granted (in dollars per share)     $ 53.23       $ 53.23     $ 46.12  
Annual forfeiture rate assumption (as a percent)         0.00% 6.00%          
Number of types of performance awards granted to employees       3              
Right to receive shares as percentage of award             100.00%        
Number of years over which performance criteria is to be met       3 years              
Minimum operating cash flow for the year preceding the performance period               $ 100      
Number of criteria considered for awarding performance shares                 3    
Vesting rights               25% of the shares vest on each the first and second anniversary dates following the date of grant and 50% of the shares vest on the third anniversary following the date of the grant An employee will earn one-third of the award granted for each internal performance metric that the Company meets at the end of the performance period.    
Number of other companies in the Company's peer group                     16
Assumptions:                      
Value per Share, low end of range (in dollars per share)                     $ 40.86
Value per Share, high end of range (in dollars per share)                     $ 67.51
Stock price volatility (as a percent)                   43.80%  
Risk free rate of return (as a percent)                   0.40%  
Expected dividend yield (as a percent)                   0.20% 0.10%
Stock Price Volatility, low end of range (as a percent)                     33.00%
Stock Price Volatility, high end of range (as a percent)                     46.10%
Risk free rate of return, low end of range (as a percent)                     0.10%
Risk free rate of return, high end of range (as a percent)                     0.30%