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STOCK-BASED COMPENSATION (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
May 17, 2011
Stock-based compensation            
Increase in the number of shares available under the 2011 plan 1,800,000          
Maximum shares of common stock that can be issued under the 2011 plan           3,600,000
Shares available for future grant under the 2011 Plan   2,600,000   2,600,000    
Total after-tax share-based compensation cost by type of program            
Before-tax share-based compensation expense   $ 2.6 $ 5.0 $ 4.5 $ 6.1  
Income tax benefit   (0.9) (1.7) (1.5) (2.0)  
After-tax share-based compensation expense   1.7 3.3 3.0 4.1  
Weighted average recognition period of total unrecognized compensation cost       2 years    
Total unrecognized compensation cost related to nonvested share-based compensation   26.6 11.5 26.6 11.5  
Total fair value of shares vested       2.8 2.0  
Restricted and deferred stock units
           
Total after-tax share-based compensation cost by type of program            
Before-tax share-based compensation expense   2.2 5.0 3.8 6.1  
Stock Options
           
Total after-tax share-based compensation cost by type of program            
Before-tax share-based compensation expense   $ 0.4   $ 0.7