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Stock-Based Compensation
3 Months Ended
Mar. 31, 2014
Share-based Compensation [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
The Company measures compensation cost for all stock awards at fair value on the date of grant and recognizes compensation cost, net of estimated forfeitures, over the requisite service period for awards expected to vest. The Company recognized $7.0 million and $9.4 million of pretax stock-based compensation expense during the three months ended March 31, 2014 and 2013, respectively.
The following table summarizes the changes in the number of shares of common stock under option for the three months ended March 31, 2014 (in millions, except per share values):
 
Shares
 
Weighted-Average Exercise Price
 
Exercisable
at Period
End
 
Aggregate    
Intrinsic    
Value    
Exercisable    
Outstanding at December 31, 2013
5.9

 
$
22

 
5.3

 
$
53.3

Exercised
(0.9
)
 
22

 
 
 
 
Forfeited / expired
(0.1
)
 
25

 
 
 
 
Outstanding at March 31, 2014
4.9

 
$
22

 
4.7

 
$
37.7




The following table summarizes the changes in the number of restricted stock units for the three months ended March 31, 2014 (shares in millions):
 
Restricted Stock Units
 
Weighted-    
Average Grant     
Date Fair Value    
Outstanding at December 31, 2013
4.2

 
$
22

Granted
1.1

 
33

Vested
(0.8
)
 
21

Forfeited
(0.2
)
 
24

Outstanding at March 31, 2014
4.3

 
$
25



During the three months ended March 31, 2014, the Company awarded 0.7 million performance stock units which entitle recipients to shares of the Company’s stock at the end of a three-year vesting period, if specified market conditions are achieved (“PSUs”). The PSUs entitle recipients to shares of common stock equal to 0% up to 200% of the number of units granted at the vesting date depending on the level of achievement of the specified market and service conditions. As of March 31, 2014, 2.0 million PSUs were outstanding, and based on performance through March 31, 2014, recipients of PSUs would be entitled to 2.1 million shares at the vesting date. The PSUs are included in the preceding table as if the participants earn shares equal to 100% of the units granted.

As of December 31, 2013, the Company had 0.3 million outstanding performance-based restricted stock units that entitle the recipients to shares of common stock if specified market and service conditions are achieved and vest no earlier than one year from the date of grant and no later than seven years from the date of grant (“Stock Price Based RSUs”). During the three months ended March 31, 2014, 0.1 million of Stock Price Based RSUs vested. Based on performance through March 31, 2014, the market conditions have been achieved for substantially all of the remaining 0.2 million of outstanding Stock Price Based RSUs. Accordingly, the Stock Price Based RSUs will vest when the service conditions are achieved. The 0.2 million Stock Price Based RSUs are included in the preceding table as outstanding as of March 31, 2014.