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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2012
Stockholders' Equity  
Summary of share repurchases

 

 
   
  Amount
Authorized
by Board
(Shares in
millions)
   
  Shares
Remaining
Under Board
Authorization
(millions)
  Shares Repurchased
Under Board
Authorization
 
 
   
  Total
Shares
Purchased
(millions)
 
 
  Expiration
Date
 
Repurchase Program Authorization Date
  2012   2011   2010  

July 2008

  none     4.0     4.0                 2.1  

July 2010

  none     4.0     4.0             2.9     1.1  

October 2011

  none     4.0     2.6     1.5     2.5     0.1      
                                     

Total shares repurchased under authorization

    2.5     3.0     3.2  
                                     

Cost (millions)

 
$

23.5
 
$

38.9
 
$

50.3
 
                                     

Average share price

  $ 9.50   $ 13.09   $ 15.95