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STOCK-BASED COMPENSATION (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Jan. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
May 17, 2011
Stock-based compensation          
Increase in the number of shares available under the 2011 plan 1.8        
Maximum shares of common stock that can be issued under the 2011 plan         3.6
Shares available for future grant under the 2011 Plan   2.5      
Total after-tax share-based compensation cost by type of program          
Before-tax share-based compensation expense   $ 11.6 $ 9.1 $ 6.6  
Income tax benefit   (3.9) (2.8) (1.7)  
After-tax share-based compensation expense   7.7 6.3 4.9  
Total unrecognized compensation cost related to nonvested share-based compensation   18.5 8.9    
Weighted average recognition period of total unrecognized compensation cost   1 year 1 year    
Total fair value of shares vested   3.3 5.3 5.3  
Restricted and deferred stock units
         
Total after-tax share-based compensation cost by type of program          
Before-tax share-based compensation expense   10.6 9.1 6.4  
Stock Options
         
Total after-tax share-based compensation cost by type of program          
Before-tax share-based compensation expense   $ 1.0   $ 0.2