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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2013
STOCK-BASED COMPENSATION  
Summary of share-based compensation cost by type of program

 

 
   Year Ended December 31,  
(In millions)
   2013   2012   2011  

Restricted stock units expense

   $ 10.6   $ 9.1   $ 6.4  

Stock options expense

     1.0     -     0.2  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
Summary of stock option activity under all plans

 

 
   Shares   Weighted
Average
Remaining
Contractual
Terms
(Years)		   Weighted
Average
Exercise
Price		   Aggregate
Intrinsic Value
(In millions)		  

Outstanding on January 1, 2013

     125,564       $ 292.76        

Granted

     188,330         33.72        

Exercised

     (3,304 )       21.25        

Expired

     (7,656 )       554.13        
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding on December 31, 2013

     302,934   6.3 years   $ 128.08   $ 3.7  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                       

Exercisable as of December 31, 2013

     114,604   3.9 years   $ 283.13   $ 1.2  

Vested or expected to vest as of December 31, 2013

     298,956   6.3 years   $ 130.67   $ 3.7  
Summary of information about stock options outstanding by range of exercise prices

 

 
   Outstanding   Exercisable  
Range of Exercise Prices
  Shares   Weighted
Average
Exercise
Price		   Weighted
Average
Remaining
Contractual
Life		   Shares   Weighted Average Exercise Price  

$8.75 to $21.25

     41,444   $ 20.83   5.2 years     41,444   $ 20.83  

$28.75 to $41.50

     193,730     33.85   7.6 years     5,400     38.19  

$90.50 to $476.00

     27,158     171.93   4.1 years     27,158     171.93  

$510.75 to $1,334.50

     40,602     657.82   2.3 years     40,602     657.82  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

$8.75 to $1,334.50

     302,934   $ 128.08   6.25 years     114,604   $ 283.13  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           
Summary of restricted stock unit activity under all plans

 

 
   Shares   Weighted
Average
Remaining
Contractual
Terms
(Years)		   Weighted
Average
Grant
Date
Fair Value		   Aggregate
Intrinsic Value
(In millions)		  

Outstanding on January 1, 2013

     716,907       $ 27.86        

Granted

     450,169         45.20        

Vested and released

     (128,340 )       25.69        

Forfeited

     (29,433 )       34.12        
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding on December 31, 2013

     1,009,303   1.0 Years   $ 35.68   $ 47.9  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                       

Vested or expected to vest as of December 31, 2013

     1,003,454   1.0 Years   $ 35.64   $ 47.6  
Weighted average assumptions used in the Monte Carlo simulation model to estimate the fair value of PRSUs granted

 

 
   PRSU Grants
Year Ended December 31,
 
   2012   2011

Assumptions:

        

Risk-free interest rate

   0.44%   0.95%

Expected life

   3.0 years   3.0 years

Expected volatility

   45%   45%

Expected dividend yield

   1.07%   -%